担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

Digital Holographic Microscopy (DHM) is a 3D imaging technology widely applied in biology, microelectronics, and medical research. However, the noise generated during the 3D imaging process can affect the accuracy of medical diagnoses. To solve this problem, we proposed several frequency domain filtering algorithms. However, the filtering algorithms we proposed have a limitation in that they can only be applied when the distance between the direct current (DC) spectrum and sidebands are sufficiently far. To address these limitations, among the proposed filtering algorithms, the HiVA algorithm and deep learning algorithm, which effectively filter by distinguishing between noise and detailed information of the object, are used to enable filtering regardless of the distance between the DC spectrum and sidebands. In this paper, a combination of deep learning technology and traditional image processing methods is proposed, aiming to reduce noise in 3D profile imaging using the Improved Denoising Diffusion Probabilistic Models (IDDPM) algorithm.

DOI： 10.3390/s24061950

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

In this paper, we propose a method for the three-dimensional (3D) image visualization of objects under photon-starved conditions using multiple observations and statistical estimation. To visualize 3D objects under these conditions, photon counting integral imaging was used, which can extract photons from 3D objects using the Poisson random process. However, this process may not reconstruct 3D images under severely photon-starved conditions due to a lack of photons. Therefore, to solve this problem, in this paper, we propose N-observation photon-counting integral imaging with statistical estimation. Since photons are extracted randomly using the Poisson distribution, increasing the samples of photons can improve the accuracy of photon extraction. In addition, by using a statistical estimation method, such as maximum likelihood estimation, 3D images can be reconstructed. To prove our proposed method, we implemented the optical experiment and calculated its performance metrics, which included the peak signal-to-noise ratio (PSNR), structural similarity (SSIM), peak-to-correlation energy (PCE), and the peak sidelobe ratio (PSR).

DOI： 10.3390/s24061731

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

Recently, many researchers have been studying the visualization of images and the recognition of objects by estimating photons under photon-starved conditions. Conventional photon-counting imaging techniques estimate photons by way of a statistical method using Poisson distribution in all image areas. However, Poisson distribution is temporally and spatially independent, and the reconstructed image has a random noise in the background. Random noise in the background may degrade the quality of the image and make it difficult to accurately recognize objects. Therefore, in this paper, we apply photon-counting imaging technology only to the area where the object is located to eliminate the noise in the background. As a result, it can be seen that the image quality using the proposed method is better than that of the conventional method and the object recognition rate is also higher. Optical experiments were conducted to prove the denoising performance of the proposed method. In addition, we used the structure similarity index measure (SSIM) as a performance metric. To check the recognition rate of the object, we applied the YOLOv5 model. Finally, the proposed method is expected to accelerate the development of astrophotography and medical imaging technologies.

DOI： 10.3390/electronics13010038

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

Recently, research on disease diagnosis using red blood cells (RBCs) has been active due to the advantage that it is possible to diagnose many diseases with a drop of blood in a short time. Representatively, there are disease diagnosis technologies that utilize deep learning techniques and digital holographic microscope (DHM) techniques. However, three-dimensional (3D) profile obtained by DHM has a problem of random noise caused by the overlapping DC spectrum and sideband in the Fourier domain, which has the probability of misjudging diseases in deep learning technology. To reduce random noise and obtain a more accurate 3D profile, in this paper, we propose a novel image processing method which randomly selects the center of the high-frequency sideband (RaCoHS) in the Fourier domain. This proposed algorithm has the advantage of filtering while using only recorded hologram information to maintain high-frequency information. We compared and analyzed the conventional filtering method and the general image processing method to verify the effectiveness of the proposed method. In addition, the proposed image processing algorithm can be applied to all digital holography technologies including DHM, and in particular, it is expected to have a great effect on the accuracy of disease diagnosis technologies using DHM.

DOI： 10.3390/biomimetics8080563

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Yeosu   2023年10月17日  -  2023年10月17日

In this paper, we propose a system that enables visualization under the situation of scattering media such as fog and smoke by Peplography which is scattering media removal system, on a small GPU machine. Compared to conventional haze removal techniques, peplography technology is capable of removing more dense scattering media and can handle cases where the density of fog varies in the image. On the other hand, the conventional peplography process is performed on a desktop PC, and no system has yet been developed to perform peplography in an outside environment. Thus, we have developed a peplography system using the Jetson AGX Xavier, a single-board computer equipped with a GPU, which is superior to conventional methods in terms of portability, execution speed, and power consumption. We also demonstrate the performance of this system by conducting experiments using this system under a simulated scattering media scene and evaluating the obtained results in terms of FPS and the image evaluation metric.

DOI： 10.23919/ICCAS59377.2023.10317059

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Yeosu   2023年10月17日  -  2023年10月20日

Digital Holographic Microscopy (DHM) can display 3D profiles of microscopic objects and is expected to be used in a wide range of fields such as microbiology, microstructural investigation, and disease diagnosis. Since these fields require detailed information of the object, acquiring an accurate 3D profile is the most important. However, DHM requires several experimental equipments, and it does not define appropriate lasers for interferometers. Therefore, in this paper, we implement an experiment and find the optimum laser for the most accurate 3D profiles of interferometers by comparing 3D profiles using two types of interferometers and three types of lasers with different wavelengths. The results show that the relationship between the laser's coherence length and the optical path length of the interferometer is related to the accuracy of the 3D profiles. They also show that the accuracy of the 3D profile is higher when the coherence length is longer than the optical path length plus twice the height of the object.

DOI： 10.23919/ICCAS59377.2023.10316950

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Yeosu   2023年10月17日  -  2023年10月20日

In this paper, we propose an improved occluded object visualization method using semantic segmentation and predictive labeling based on integral imaging (InIm) technology. InIm is a passive 3D visualization technique that can generate 3D information through elemental images with different perspectives of information about an object and, it can be used to remove occlusion. However, occlusion pixels in elemental images can degrade the quality of reconstructed images. Our proposed method can remove occlusion and visualize the object of interest. In addition, we propose a predictive labeling method for reducing processing time, which can generate accurate 3D object information without occlusion. Therefore, when the proposed method is commercialized, it is expected to contribute to increasing the safety of autonomous driving technology.

DOI： 10.23919/ICCAS59377.2023.10316784

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Yeosu   2023年10月17日  -  2023年10月20日

Digital Holographic Microscopy (DHM) is an imaging technique that has been widely used in biological and medical research. However, the spatial resolution of DHM is often limited by numerical aperture (NA) of the objective lens. In the present thesis, a novel approach is proposed to enhance the resolution of DHM images by utilizing the Real-ESRGAN algorithm in combination with a low NA of the objective lens. Acquiring images using a low NA objective lens and subsequently applying the Real-ESRGAN algorithm enables the attainment of higher resolution images comparable to those obtained with a higher NA objective lens, while maintaining cost-effectiveness. Experiments were conducted on real-world DHM datasets to evaluate the performance of the approach. As a result, our proposed approach can effectively enhance the resolution of DHM images, revealing finer details that were previously unattainable with a low NA objective lens alone. Our approach has the potential to significantly reduce the cost of DHM imaging by utilizing lower NA objective lenses while achieving a comparable resolution to higher NA lenses, which makes it a promising technique for a wider application in the biological and medical field.

DOI： 10.23919/ICCAS59377.2023.10316877

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Yeosu   2023年10月17日  -  2023年10月20日

Currently, Digital Holographic Microscopy(DHM) is used for researching disease diagnosis or microbes. It cannot obtain the correct three-dimensional (3D) profile for a little noise because biological cells are microscopic. Then we need images of the focal point of DHM for reducing noise. However, in DHM, the depth of field becomes smaller influenced by the objective lens. In addition, focusing to obtain hologram images of biological cells in conventional DHM systems is entirely manual, because the decision of the focal point is made by the photographer's senses, which makes it even more difficult to focus on the object. These factors make it difficult for the conventional DHM system to acquire images of the focal points. Therefore, in this paper, we propose the analysis of accurate focusing points using a noise map. This eliminates the illusion or misperception that is a drawback of the manual. We improved an accurate 3D profile. 3D profiles were created at the focal point by the proposed method and at the positions before and after the focal points, and evaluated for SNR. From this, the proposed method can be used to analyze biological cells and microstructures.

DOI： 10.23919/ICCAS59377.2023.10316971

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Yeosu   2023年10月17日  -  2023年10月20日

In this paper, we propose a method to improve the recognition rate of ArUco markers under photon-starved conditions by using preprocessing such as photon counting algorithm and histogram equalization to estimate the exact three-dimensional(3D) location of improved objects. In the conventional ArUco marker recognition technology, the recognition rate of ArUco markers decreases under photon-starved conditions, and the exact 3D location of the object cannot be estimated. In the conventional ArUco marker recognition technology, the photon counting algorithm can be used to estimate the 3D location of objects by recognizing ArUco markers under photon-starved conditions. However, the photon counting algorithm has the problem that the computation speed is slowed down when there are many photons to estimate, and the recognition rate of the ArUco marker is reduced when there are few photons to estimate. To solve these problems of the photon counting algorithm and improve the recognition rate of ArUco markers, we apply histogram equalization to ArUco markers with the photon counting algorithm. To verify the feasibility of the proposed method, we implement simulations using the Open Manipulator-X platform and show performance metrics such as Peak Signal-to-Noise Ratio (PSNR).

DOI： 10.23919/ICCAS59377.2023.10317027

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Yeosu   2023年10月17日  -  2023年10月20日

In this paper, we propose the depth mapping and occlusion removal method using integral imaging (InIm). InIm is a method to obtain 3D information by capturing and reconstructing an object from multiple viewpoints. InIm can remove occlusion using parallax obtained by photographing an object from multiple viewpoints. However, occlusion removal uses a unit matrix to calculate the number of overlaps, which results in an overall darkening of the image. To solve this problem, this paper aims to improve occlusion removal by using the matrix of the mask image to calculate the number of overlaps. InIm can provide depth mapping that shows the distance from an object as pixel values. However, when there is an occlusion in front of the object, it is difficult to provide depth mapping object due to the influence of the occlusion. To solve this problem, we propose a method of depth mapping and occlusion removal method using InIm. Our method is expected to make great progress in improving safety in the field of autonomous driving.

DOI： 10.23919/ICCAS59377.2023.10316945

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Yeosu   2023年10月17日  -  2023年10月20日

Noise removal in scattering media environments such as fog and smoke are an important task in reality. For example, it can be applied in many fields such as searching under turbid water and rescuing in smoke. Therefore, the purpose of this research is to remove the noise under the scattering medium environment and to visualize the object. As a conventional method for removing noise, there is a technique called peplography. Peplograhy enables the denoising of dense fog and reconstructing the image in scattering media environments. However, peplography has a problem that complex noise exists after removing particularly deep noise, and as a result, it becomes difficult to visualize the object. This research aims to solve this problem. We propose a new denoising technology that combines peplography with DCLGAN. DCLGAN is an image transformation algorithm using deep learning and an improved model of CycleGAN which is also used in the field of noise reduction. In this study, we evaluate the conventional method and the proposed method for scattering media images. As the evaluation method, visual evaluation and numerical evaluation using the PSNR index are performed to demonstrate the effectiveness of the proposed method. We believe that the proposed method can be applied in various fields such as object visualization under turbid water and automatic driving technology with fog removed.

DOI： 10.23919/ICCAS59377.2023.10316830

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Yeosu   2023年10月17日  -  2023年10月20日

In this paper, we propose a method for visualizing object information under low light conditions using photon-counting integral imaging and depth images as prior information. To visualize 3D objects under low-light conditions, computational photon-counting imaging may be used. It is possible to estimate photons using statistical methods such as the Poisson distribution. Therefore, photon-counting integral imaging can visualize 3D images under low-light conditions by maximum likelihood estimation (MLE). However, MLE does not consider prior information so it may not be an accurate estimation. In addition, it is difficult to obtain accurate depth information as the distance increases due to rounding errors caused by computational reconstruction. Therefore, we propose Bayesian estimation such as a maximum a posteriori estimation method that uses as a priori information images from a depth camera, which can be acquired even in low-light conditions, to improve the quality of 3D images. To evaluate image quality of the proposed method, optical experiments were conducted by calculating image quality metrics. This technology can be utilized for night vision applications, such as object recognition in security camera systems and autonomous driving, using RGB cameras and depth cameras.

DOI： 10.23919/ICCAS59377.2023.10316844

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

In recent years, research on three-dimensional (3D) reconstruction under low illumination environment has been reported. Photon-counting integral imaging is one of the techniques for visualizing 3D images under low light conditions. However, conventional photon-counting integral imaging has the problem that results are random because Poisson random numbers are temporally and spatially independent. Therefore, in this paper, we apply a technique called Kalman filter to photon-counting integral imaging, which corrects data groups with errors, to improve the visual quality of results. The purpose of this paper is to reduce randomness and improve the accuracy of visualization for results by incorporating the Kalman filter into 3D reconstruction images under extremely low light conditions. Since the proposed method has better structure similarity (SSIM), peak signal-to-noise ratio (PSNR) and cross-correlation values than the conventional method, it can be said that the visualization of low illuminated images can be accurate. In addition, the proposed method is expected to accelerate the development of autonomous driving technology and security camera technology.

DOI： 10.3390/s23177571

Kyutacar

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

Digital holographic microscopy (DHM) is a three-dimensional (3D) imaging technique that uses the phase information of coherent light. In the reconstruction process of DHM, a narrow region around the positive or negative sideband from the Fourier domain is windowed to avoid noise due to the DC spectrum of the hologram spectrum. However, the limited size of the window also degrades the high-frequency information of the 3D object profile. Although a large window can have more detailed information of the 3D object shape, the noise is increased. To solve this trade-off, we propose phase difference averaging (PDA). The proposed method yields high-frequency information of the specimen while reducing the DC noise. In this paper, we explain the reconstruction algorithm for this method and compare it to various conventional filtering methods including Gaussian, Wiener, average, median, and bilateral filtering methods

DOI： 10.56977/jicce.2023.21.1.90

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

The phase reconstruction process in digital holographic microscopy involves a trade-off between the phase error and the high-spatial-frequency components. In this reconstruction process, if the narrow region of the sideband is windowed in the Fourier domain, the phase error from the DC component will be reduced, but the high-spatial-frequency components will be lost. However, if the wide region is windowed, the 3D profile will include the high-spatial-frequency components, but the phase error will increase. To solve this trade-off, we propose the high-variance pixel averaging method, which uses the variance map of the reconstructed depth profiles of the windowed sidebands of different sizes in the Fourier domain to classify the phase error and the high-spatial-frequency components. Our proposed method calculates the average of the high-variance pixels because they include the noise from the DC component. In addition, for the nonaveraged pixels, the reconstructed phase data created by the spatial frequency components of the widest window are used to include the high-spatial-frequency components. We explain the mathematical algorithm of our proposed method and compare it with conventional methods to verify its advantages.

DOI： 10.4218/etrij.2021-0311

Kyutacar

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

In this paper, we propose three-dimensional(3D) visualization of objects in heavy scattering media by using peplography and wavelet transform. Conventional haze removal techniques can remove the light haze in the image by using various image processing algorithms or machine learning techniques. However, they may not provide a clear image under heavy scattering media. On the other hand, peplography can visualize the object by detecting ballistic object photons from heavy scattering media. Then, 3D image can be generated by integral imaging. However, it may not visualize 3D object information accurately because of the noise photons from scattering media. Therefore, the image quality for 3D object visualization may be degraded. To solve this problem, we use the discrete wavelet transform in peplography. It can detect the object photon signals from the scattering media and enhance 3D image contrast ratio by using a specific coefficient threshold technique. To prove our method, we carry out the optical experiments and compare with conventional haze removal method and peplography by using various image quality metrics such as correlation, structural similarity, and peak signal to noise ratio.

DOI： 10.1109/ACCESS.2022.3231742

Kyutacar

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

In this paper, we propose a non-fungible token (NFT) transaction method that can commercialize the real 3D property and make property sharing possible using the 3D reconstruction technique. In addition, our proposed method enhances the security of NFT copyright and metadata by using optical encryption. In general, a conventional NFT is used for 2D image proprietorial rights. To expand the scope of the use of tokens, many cryptocurrency industries are currently trying to apply tokens to real three-dimensional (3D) property. However, many token markets have an art copyright problem. Many tokens have been minted without considering copyrights. Therefore, tokenizing real property can cause significant social issues. In addition, there are not enough methods to mint 3D real property for NFT commercialization and sharing property tokens. Therefore, we propose a new token management technique to solve these problems using integral imaging and double random phase encryption. To show our system, we conduct a private NFT market using a test blockchain network that can demonstrate the whole NFT transaction process.

DOI： 10.3807/COPP.2022.6.6.565

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Jeju   2022年10月19日  -  2022年10月21日

In this paper, we propose the improved occluded object visualization method by using integral imaging and semantic segmentation. Integral imaging is the passive 3D visualization technique that can generate 3D information through elemental images that have different perspectives of information on 3D objects. Moreover, it can be used to remove the occlusion in the 3D scene. The elemental image's various perspective information can be utilized to remove the occlusion in the 3D scene via the 3D image reconstruction process. However, the occlusion object pixels in the elemental image can degrade the image quality of the 3D image. Therefore, it is difficult to visualize the object without occlusion, clearly. To solve this problem, we propose the occluded object visualization method that can remove the occlusion and can visualize the target 3D object by using semantic segmentation. Semantic segmentation is the machine learning technique that can recognize the labeled object in the scene. Therefore, it can generate the specific labeled object mask image. Then, our proposed method can generate accurate 3D target object information. To prove our method, we carry out the simulation experiment and evaluate image quality with a correlation metric.

DOI： 10.1109/ICTC55196.2022.9952712

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Jeju   2022年10月19日  -  2022年10月21日

In this paper, we propose a method that can generate a three-dimensional (3D) depth map accurately by using an integral imaging technique through low-resolution elemental images. The conventional method may produce an accurate 3D depth map when it utilizes high-resolution images. However, if the elemental image has low resolution, it can cause the shifting pixel error when it reconstructs the 3D image by using volumetric computational reconstruction (VCR). Therefore, it may not provide a high-quality 3D depth map through the reconstructed image. To solve this problem, our proposed method utilizes a machine learning technique that can enhance the resolution of the elemental image. Our proposed method enlarged the low-resolution elemental image. Then, it generates the high-resolution image through the super-resolution convolution neural network (SRCNN). Therefore, it can reduce the shifting pixel error and it can generate various reconstructed images according to the depth. Finally, it can generate an accurate 3D depth map through the error-reduced 3D image. To prove our proposed depth map accuracy, we implement the simulation experiment and evaluate the image through the image quality metric.

DOI： 10.1109/ICTC55196.2022.9952662

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Jeju   2022年10月19日  -  2022年10月21日

In this paper, we propose 3D photon counting integral imaging using the Kalman estimation. Photons are emitted in unit time and space independently. To visualize the 3D object under low luminance conditions, computational photon counting imaging may be used. It can estimate the photons by statistical methods such as the Poisson random distribution. Then, it can reconstruct the 3D information through the integral imaging. However, since the Poisson random process always generates different photon counting images, the image quality is not consistent and also errors may occur. Therefore, it is difficult to maintain the high 3D image quality under photon-starved conditions. To solve these problems, we utilize Kalman estimation to estimate the photons accurately and generate the high image quality consistently under various low light conditions. To evaluate our proposed method, we implemented optical experiments and image quality evaluation by calculating image quality metrics.

DOI： 10.1109/ICTC55196.2022.9952470

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Jeju   2022年10月19日  -  2022年10月21日

Recently, there have been studied using Digital Holographic Microscopy (DHM) research and deep learning technology to analyze cells or diagnose diseases. 3D information of microscopic substances can be obtained through DHM, and several diseases can be diagnosed through the analysis of red blood cell (RBC)s in the human body. However, deep learning systems still show diagnostic results with lower accuracy than human judgment and have disadvantages in that more training data and expensive computers are needed to increase the accuracy. To overcome these shortcomings and help human judgment, this study proceeds with a study to automatically display 3D visual information and statistical data of RBC s in a system using 3D imaging technology based on DHM. Through this, depth information and shape data that are difficult to obtain with only two-dimensional information can be obtained. Therefore, using the average and variance values of each parameter as indicators, it is expected to help diagnose the presence or absence of diseases in which shape changes such as expansion or loss of groove height of the RBC occur.

DOI： 10.1109/ICTC55196.2022.9952868

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

In this paper, we propose three-dimensional (3D) photon counting integral imaging by using multi-level decomposition such as discrete wavelet transform to improve the visual quality and measurement accuracy under photon-starved conditions. Conventional 3D integral imaging can visualize 3D objects and acquire their depth information. However, the amount of irradiated light on the object causes the degradation of visual quality for 3D images under photon-starved conditions. To visualize 3D objects, photon counting integral imaging has been utilized. It can detect photons from 3D scenes by using a computational photon counting model, which is modelled by the Poisson random process. However, photons occur not only from objects but also in areas where objects do not exist. Moreover, photon fluctuation may occur in the scene through shot noise. Since these noise photons are measurement errors, it may decrease the image quality and accuracy. In contrast, our proposed method uses 2D discrete wavelet transform, which can emphasize the object photons effectively. Finally, our proposed method can enhance the visual quality of 3D images and provide more accurate depth information under photon-starved conditions. To prove the feasibility of our proposed method, we implement the optical experiment and calculate various image quality metrics.

DOI： 10.1364/JOSAA.463623

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

THAILAND   Phuket   2022年07月05日  -  2022年07月08日

In digital holographic microscopy (DHM) technol-ogy, we have to record a magnified laser beam that has passed through an objective lens onto an image sensor. In this process, when the specimen is not positioned on the accurate focal plane of the objective lens, a noise called a phase error occurs. This phase error becomes a factor that prevents accurate analysis by the observer. In addition, as the magnification of the objective lens increases, the depth of field becomes narrow, making it difficult to find an accurate focal plane. To solve this problem, we propose a method to find the optimal focal plane using the noise map generated by the recorded holographic video. In this paper, we verify the effectiveness of the proposed method by comparing the optimal 3D profile in the focal plane found by the proposed method and the 3D profile in a different position with the ideal comparison target, respectively.

DOI： 10.1109/ITC-CSCC55581.2022.9895093

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

In the image processing method of digital holographic microscopy (DHM), we can obtain a phase information of an object by windowing a sideband in Fourier domain and taking inverse Fourier transform. In this method, it is necessary to window a wide sideband to obtain detailed information on the object. However, since the information of the DC spectrum is widely distributed over the entire range from the center of Fourier domain, the window sideband includes not only phase information but also DC information. For this reason, research on acquiring only the phase information of an object without noise in digital holography is a challenging issue for many researchers. Therefore, in this paper, we propose the use of a windowed sideband array (WiSA) as an image processing method to obtain an accurate three-dimensional (3D) profile of an object without noise in DHM. The proposed method does not affect the neighbor pixels of the filtered pixel but removes noise while maintaining the detail of the object. Thus, a more accurate 3D profile can be obtained compared with the conventional filter. In this paper, we create an ideal comparison target i.e., microspheres for comparison, and verify the effect of the filter through additional experiments using red blood cells.

DOI： 10.3390/s22134844

Kyutacar

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

In this paper, we propose an effective noise reduction method for photon counting imaging using a discrete wavelet transform. Conventional 2D photon counting imaging was used to visualize the object under dark conditions using statistical methods, such as the Poisson random process. The photons in the scene were estimated using a statistical method. However, photons which disturb the visualization and decrease the image quality may occur in the background where there is no object. Although median filters are used to reduce the noise, the noise in the scene remains. To remove the noise effectively, our proposed method uses the discrete wavelet transform, which removes the noise in the scene using a specific thresholding method that utilizes photon counting imaging characteristics. We conducted an optical experiment to demonstrate the denoising performance of the proposed method.

DOI： 10.6109/jicce.2021.19.4.276

Kyutacar

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Jeju   2021年10月20日  -  2021年10月22日

In a reconstruction of the 3D profile in digital holographic microscopy technology, there is a tradeoff relationship between detailed information of the target and the degree of noise depending on how wide the sideband of the Fourier domain is windowed. Besides, the conventional filtering method may not provide accurate height information because it filters using height information of surrounding pixels of the pixel to be filtered. For this reason, we propose a new filtering method that reduces noise by applying a Gaussian weighted windowed sideband in this paper. We compare the proposed filtering method with conventional filtering and verify the advantages and disadvantages of our method.

DOI： 10.1109/ICTC52510.2021.9620964

Kyutacar

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Jeju   2021年10月20日  -  2021年10月22日

Image encryption technique has been actively researched and improved. Double Random Phase Encryption (DRPE), known as the typical way of optical encryption, can easily encrypt images. In the decryption process of DRPE, the complex conjugate of random phase mask used as the encryption key in the Fourier domain is used as the decryption key. As a result, computational DRPE has a vulnerability in image transmission when the random phase mask is stolen. Our proposed method utilizes the random function defined by the sender, and it generates additional random variable to multiply the random phase mask. Finally, our proposed method can enhance the security of the encryption process. However, the random phase mask and random variable information generated by random function are needed to decrypt the image. To send both information, high cost is required in the transmission process. To overcome this problem, our proposed method sends the conjugate random phase mask and random function to the receiver for the decryption process. Finally, our proposed method can enhance security with a low transmission cost.

DOI： 10.1109/ICTC52510.2021.9621077

Kyutacar

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Jeju   2021年10月20日  -  2021年10月22日

Scatter denoising is a challenging project for removing noise under scattered media conditions such as fog and turbid water. In the previous studies, blurring caused by scattering media particles in fog or turbid water was solved by low-pass filtering or by removing the estimated scattering media and then amplifying the brightness with the photon-counting algorithm. However, these methods lose the accurate color information of the object by low-frequency filtering or using the probability-based photon-counting algorithm. Moreover, it is difficult to obtain shape information of an object under heavy turbidity. To solve this problem, we propose a new algorithm of scatter removal by combining Fourier domain filtering and integral imaging. To prove the proposed method, we carry out numerical analysis of experimental results by previous method and our proposed method.

DOI： 10.1109/ICTC52510.2021.9620963

Kyutacar

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Jeju   2021年10月20日  -  2021年10月22日

In this paper, we propose an augmented reality head-up display (ARHUD) algorithm and system that can enhance the information visualization for drivers. Recently, Head-up Display (HUD) getting popular in the automotive industry. It can serve the car and other information to the driver efficiently. Therefore, the drivers do not have to move the perspectives to the car dashboard. Finally, it can reduce the accident rate effectively. On the other hand, HUD serves only 2D information, and it is challenging to provide suitable 3D information according to road conditions. To overcome this problem, ARHUD has been developed. ARHUD can generate 3D information and can serve adaptive information for drivers by using a car camera. However, the conventional ARHUD defines content color without considering the road condition. It can cause a critical visualization problem. For example, if the information color and the car color are the same in an actual traffic situation, it is not easy to visualize the content information. In addition, to recognize the road situation in real-time, an image processing machine is needed. However, the conventional machine consumes much electricity, and it can cause vehicle discharge. To solve these problems, we propose an effective processing algorithm and system which can define the content color and recognize the object with high speed without consumes high electricity.

DOI： 10.1109/ICTC52510.2021.9620873

Kyutacar

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

In this paper, we present a computational volumetric reconstruction method for three-dimensional (3D) photon counting imaging with enhanced visual quality when low-resolution elemental images are used under photon-starved conditions. In conventional photon counting imaging with low-resolution elemental images, it may be difficult to estimate the 3D scene correctly because of a lack of scene information. In addition, the reconstructed 3D images may be blurred because volumetric computational reconstruction has an averaging effect. In contrast, with our method, the pixels of the elemental image rearrangement technique and a Bayesian approach are used as the reconstruction and estimation methods, respectively. Therefore, our method can enhance the visual quality and estimation accuracy of the reconstructed 3D images because it does not have an averaging effect and uses prior information about the 3D scene. To validate our technique, we performed optical experiments and demonstrated the reconstruction results.

DOI： 10.6109/jicce.2021.19.3.180

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

In this paper, we propose three-dimensional (3D) photon counting double random phase encryption (DRPE) with enhanced visual quality and security level. Conventional 3D photon counting DRPE can encrypt the data quickly by using 4f optical system and random phase masks with enhanced the security because 3D photon counting technique is used. 3D photon counting DRPE extracts photons from the encrypted data by using statistical methods such as Poisson random process and the visual quality of the decrypted data can be enhanced through the 3D reconstruction process. However, it still has a problem to visualize the data when we extract extremely few photons. To improve the security and the visual quality of the decrypted data, we propose the random amplitude reconstruction process in the encryption stage. Our proposed method reconstructs the amplitude of the encrypted data at the random depth. Thus, the shifting pixel value and depth information can be another important key for decryption through the random process. Therefore, it can be effective in decrypting data securely and the visual quality of the decrypted data can be enhanced. Finally, Through the random reconstruction process in decryption process, our proposed method can enhance the security and visual quality simultaneously. To verify our proposed method, we carry out the simulation and optical experiment.

DOI： 10.1109/ACCESS.2021.3113670

Kyutacar

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Seoul   2021年08月25日  -  2021年08月27日

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Seoul   2021年08月25日  -  2021年08月27日

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Seoul   2021年08月25日  -  2021年08月27日

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Seoul   2021年08月25日  -  2021年08月27日

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Seoul   2021年08月25日  -  2021年08月27日

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Seoul   2021年08月25日  -  2021年08月27日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Seoul   2021年08月25日  -  2021年08月27日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   Seoul   2021年08月25日  -  2021年08月27日

担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

Multiview autostereoscopic three-dimensional (MA3D) displays have the disadvantage that the single-view resolution decreases as the number of views increases. Furthermore, the resolution of MA3D displays is relatively degraded, even though the resolution of two-dimensional displays has increased recently. Therefore, it is unattractive to consumers, and the single-view resolution enhancement of MA3D displays is required. In this study, we developed a method for supplementing the single-view resolution of MA3D displays using a plate beam splitter that can show two MA3D displays simultaneously. By applying our proposed method, the resolution of a single view can increase, and the visual obstruction by the optical plate, which is a problem for MA3D displays, can be solved. In addition, an MA3D display was optically designed and fabricated using a parallax barrier. Finally, the experimental optical results obtained using the proposed method and the only MA3D display were compared.

DOI： 10.6109/jicce.2021.19.2.108

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

In this paper, we propose a new three-dimensional (3D) photon-counting integral imaging reconstruction method using a merging reconstruction process and maximum likelihood estimation (MLE). The conventional 3D photon-counting reconstruction method extracts photons from elemental images using a Poisson random process and estimates the scene using statistical methods such as MLE. However, it can reduce the photon levels because of an average overlapping calculation. Thus, it may not visualize 3D objects in severely low light environments. In addition, it may not generate high-quality reconstructed 3D images when the number of elemental images is insufficient. To solve these problems, we propose a new 3D photon-counting merging reconstruction method using MLE. It can visualize 3D objects without photon-level loss through a proposed overlapping calculation during the reconstruction process. We confirmed the image quality of our proposed method by performing optical experiments.

DOI： 10.6109/jicce.2021.19.2.102

Kyutacar

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2020 ACM. In this paper, we propose a photon-counting double random phase encryption with merging reconstruction. Double random phase encryption (DRPE) is a simple and secure optical encryption technique using phase random masks. To enhance the security level, a three-dimensional photon counting technique has been applied to DRPE. However, we cannot recognize the original image information in a photon-limited scene. To solve this problem, we propose a merging reconstruction method, which can detect the photons using several reconstruction layers. Through this method, we can obtain a decrypted image of enhanced visual quality. This paper presents a simulation test for the proposed method.

DOI： 10.1145/3429536.3429540

Kyutacar

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2020 ACM. An accurate refractive index of the surrounding medium is required to measure the accurate depth of the specimen in digital holographic microscopy (DHM). Many researchers have reported a method that uses blood smear to avoid overlapping of red blood cells (RBCs). Moreover, they have applied the refractive index of the blood plasma. However, the blood smear is not blood plasma, so that it cannot obtain the accurate depth information. In addition, it is difficult to measure the refractive index of the surrounding medium in every experiment. To solve this problem, in this paper, we propose a new method to record a hologram using a sample of a mixture of blood and a uniform microsphere. We have already known the size of the microsphere in the experiment. Thus, we can modify the refractive index of the surrounding medium. Finally, we can measure the accurate depth information of the specimen using the modified refractive index of the surrounding medium. The proposed method can be used not only in RBCs but also in the study of cells or microbial.

DOI： 10.1145/3429536.3429539

Kyutacar

Scopus

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Online Conference   2020年08月25日  -  2020年08月28日

担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Online Conference   2020年08月25日  -  2020年08月28日

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Online Conference   2020年08月25日  -  2020年08月28日

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Online Conference   2020年08月25日  -  2020年08月28日

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Online Conference   2020年08月25日  -  2020年08月28日

担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

JAPAN   FUKUOKA   2020年02月19日  -  2020年02月21日

© 2020 IEEE. Auto-stereoscopic displays using slanted optical plates have inherent subpixel rasterization compared to the normal 2D displays, and mappings between subpixel positions and multi-view indices even vary according to the number of views and angles of slanted optical plates. In this paper, we derive a simple but generalized formula for subpixel mappings from a naïve ray-tracing technique on RGB stripe type panels. To verify the proposed algorithm, our proto-type auto-stereoscopic display using parallax barriers with a slanted angle was used and examined in the experiment. The proposed algorithm is expected to leverage converting multi-view 3D inputs to various types of auto-stereoscopic contents in real time.

DOI： 10.1109/ICAIIC48513.2020.9064993

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

JAPAN   FUKUOKA   2020年02月19日  -  2020年02月21日

© 2020 IEEE. In this paper, we propose a new three-dimensional (3D) photon counting integral imaging reconstruction method using elemental image merging process for the effective use of the extracted photons under severely photon starved conditions. In previous methods, the photons are extracted from elemental images using Poisson random process and 3D images are reconstructed by Maximum Likelihood Estimation (MLE). However, 3D integral imaging with photon counting do not use the photons effectively in reconstruction. Thus, it may not visualize 3D objects in severely low light level conditions. In addition, it may not generate high-quality reconstructed 3D images when the number of the recorded elemental images is insufficient. Therefore, to solve these problems, we propose a new 3D reconstruction method for photon counting integral imaging, which can generate high-quality 3D images without photon loss in the reconstruction process. To prove our method, we carry out the simulation experiments.

DOI： 10.1109/ICAIIC48513.2020.9065055

Kyutacar

Scopus

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担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Korea   Jeju   2019年10月16日  -  2019年10月18日

© 2019 IEEE. In this paper, we propose a new three-dimensional (3D) reconstruction technique in scattering media using integral imaging. In conventional integral imaging, it can visualize 3D images well when high-resolution elemental images are used. However, when low-resolution images are used, the visual quality of the 3D images is reduced. In addition, it is difficult to recognize the objects under scattering media conditions. Therefore, to visualize 3D images in scattering media, we create a mask filter in frequency domain to remove the scattering media. In addition, we calculate the density of the scattered media to adjust the contrast and histogram equalization automatically. To prove our method, we implemented optical experiments.

DOI： 10.1109/ICTC46691.2019.8939696

Kyutacar

Scopus

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   HICO, Gyeongju   2019年08月27日  -  2019年08月30日

担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   HICO, Gyeongju   2019年08月27日  -  2019年08月30日

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   HICO, Gyeongju   2019年08月27日  -  2019年08月30日

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   HICO, Gyeongju   2019年08月27日  -  2019年08月30日

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   HICO, Gyeongju   2019年08月27日  -  2019年08月30日

担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© The Korea Institute of Information and Communication Engineering. In this paper, we propose a new free-view three-dimensional (3D) computational reconstruction of integral imaging to improve the visual quality of reconstructed 3D images when low-resolution elemental images are used. In a conventional free-view reconstruction, the visual quality of the reconstructed 3D images is insufficient to provide 3D information to applications because of the shift and sum process. In addition, its processing speed is slow. To solve these problems, our proposed method uses a pixel rearrangement technique (PERT) with locally selective elemental images. In general, PERT can reconstruct 3D images with a high visual quality at a fast processing speed. However, PERT cannot provide a free-view reconstruction. Therefore, using our proposed method, free-view reconstructed 3D images with high visual qualities can be generated when lowresolution elemental images are used. To show the feasibility of our proposed method, we applied it to optical experiments.

DOI： 10.6109/jicce.2019.17.1.60

Kyutacar

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   BEXCO, Busan   2018年08月28日  -  2018年08月31日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   BEXCO, Busan   2018年08月28日  -  2018年08月31日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   BEXCO, Busan   2018年08月28日  -  2018年08月31日

担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   BEXCO, Busan   2018年08月28日  -  2018年08月31日

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   BEXCO, Busan   2018年08月28日  -  2018年08月31日

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   BEXCO, Busan   2018年08月28日  -  2018年08月31日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   BEXCO, Busan   2018年08月28日  -  2018年08月31日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   BEXCO, Busan   2018年08月28日  -  2018年08月31日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   BEXCO, Busan   2018年08月28日  -  2018年08月31日

担当区分：責任著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）

J-GLOBAL

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 IOP Publishing Ltd. Computational reconstruction of integral imaging requires much more computational loads than optical reconstruction because of the adding and averaging of many elemental images digitally. Thus, to reduce the computational loads, the pixels of elemental images rearrangement technique (PERT) has been proposed. It can reconstruct a three-dimensional (3D) image very fast, but the size of the reconstructed 3D image is different from the conventional computational reconstruction due to no consideration of the empty space between pixels on the reconstruction plane. Therefore, in this paper, we propose PERT considering the projected empty space to correct the size of the reconstructed 3D images. To verify and support our proposed method, we carry out preliminary experiments and calculate the structural similarity index.

DOI： 10.1088/2040-8986/aaa391

Kyutacar

Scopus

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担当区分：責任著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）

CiNii Article

CiNii Research

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2017 The Korea Institute of Information and Communication Engineering. In this paper, we propose a modified smart pixel mapping (SPM) to visualize occluded three-dimensional (3D) objects in real image fields. In integral imaging, orthoscopic real 3D images cannot be displayed because of lenslets and the converging light field from elemental images. Thus, pseudoscopic-to-orthoscopic conversion which rotates each elemental image by 180 degree, has been proposed so that the orthoscopic virtual 3D image can be displayed. However, the orthoscopic real 3D image cannot be displayed. Hence, a conventional SPM that recaptures elemental images for the orthoscopic real 3D image using virtual pinhole array has been reported. However, it has a critical limitation in that the number of pixels for each elemental image is equal to the number of elemental images. Therefore, in this paper, we propose a modified SPM that can solve this critical limitation in a conventional SPM and can also visualize the occluded objects efficiently.

DOI： 10.6109/jicce.2017.15.4.256

Kyutacar

Scopus

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2017, The Korea Institute of Information and Communication Engineering. In this study, we propose a three-dimensional (3D) visualization technique of occluded objects using integral imaging with a plenoptic camera. In previous studies, depth map estimation from elemental images was used to remove occlusion. However, the resolution of these depth maps is low. Thus, the occlusion removal accuracy is not efficient. Therefore, we use a plenoptic camera to obtain a high-resolution depth map. Hence, individual depth map for each elemental image can also be generated. Finally, we can regenerate a more accurate depth map for 3D objects with these separate depth maps, allowing us to remove the occlusion layers more efficiently. We perform optical experiments to prove our proposed technique. Moreover, we use MSE and PSNR as a performance metric to evaluate the quality of the reconstructed image. In conclusion, we enhance the visual quality of the reconstructed image after removing the occlusion layers using the plenoptic camera.

DOI： 10.6109/jicce.2017.15.3.193

Kyutacar

Scopus

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   BEXCO, Busan   2017年08月28日  -  2017年08月31日

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   BEXCO, Busan   2017年08月28日  -  2017年08月31日

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   BEXCO, Busan   2017年08月28日  -  2017年08月31日

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2016 Chinese Optics Letters.In this Letter, we propose an elemental image regeneration method of three-dimensional (3D) integral imaging for occluded objects using a plenoptic camera. In conventional occlusion removal techniques, the information of the occlusion layers may be lost. Thus, elemental images have cracked parts, so the visual quality of the reconstructed 3D image is degraded. However, these cracked parts can be interpolated from adjacent elemental images. Therefore, in this Letter, we try to improve the visual quality of reconstructed 3D images by interpolating and regenerating virtual elemental images with adjacent elemental images after removing the occlusion layers. To prove our proposed method, we carry out optical experiments and calculate performance metrics such as the mean square error (MSE) and the peak signal-to-noise ratio (PSNR).

DOI： 10.3788/COL201614.121101

Kyutacar

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.6109/jicce.2016.14.3.200

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   ICC Jeju, Jeju   2016年08月23日  -  2016年08月26日

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2016 Optical Society of Korea.In this paper, we present a resolution-enhanced computational integral imaging reconstruction method by using boundary folding mirrors. In the proposed method, to improve the resolution of the computationally reconstructed 3D images, the direct and reflected light information of the 3D objects through a lenslet array with boundary folding mirrors is recorded as a combined elemental image array. Then, the ray tracing method is employed to synthesize the regular elemental image array by using a combined elemental image array. From the experimental results, we can verify that the proposed method can improve the visual quality of the computationally reconstructed 3D images.

DOI： 10.3807/JOSK.2016.20.3.363

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2016 Optical Society of Korea.In this paper, we propose a nonlinear maximum average correlation height (MACH) filter for information authentication of photon counting double random phase encryption (DRPE). To enhance the security of DRPE, photon counting imaging can be applied because of its sparseness. However, under severely photon-starved conditions, information authentication of DRPE may not be implemented successfully. To visualize the photon counting DRPE, a three-dimensional imaging technique such as integral imaging can be used. In addition, a nonlinear MACH filter can be utilized for helping the information authentication. Therefore, in this paper, we use integral imaging and nonlinear MACH filter to implement the information authentication of photon counting DRPE. To verify our method, we implement optical experiments and computer simulation.

DOI： 10.3807/JOSK.2016.20.2.228

Scopus

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.6109/jicce.2016.14.1.051

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2016 Har Krishan Bhalla & Sons.Abstract: Essential oil extracted with supercritical CO2 fluid from the brown seaweed Undariapinnatifida showed high anti-inflammatory activity. Optimal extraction with supercritical CO2 was observed at 45°C and 20 MPa. The essential oil was active against mouse ear inflammation induced by phorbol myristate acetate, with median inhibition concentration IC50 values of 87, 134, and 158 µg per ear for edema, erythema, and blood flow, respectively. The major component compounds were palmitic acid (26 %), 2-(9,12- octadecadienyloxy)-,(z,z)-ethanol (16 %), eicosa-5,8,11,14,17-pentaenoate (EPA; 13 %), and 5,7,11- eicosatrienoic acid (mead acid; 12 %). These findings are consistent with the claims that the seaweed U. pinnatifida can be used in remedies for inflammation-related symptoms.

DOI： 10.1080/0972060X.2014.989181

Scopus

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2015 IEEE.With the objective of developing a system to quantitatively measure the active states of microorganisms and cells by using laser speckle, we performed simulations to determine the optimum system parameters. In this study, the obtained optimum parameters were applied, dynamic speckle was observed by measuring moving objects with an optical device, and the parameters obtained from the dynamic speckle were evaluated.

DOI： 10.1109/ICTC.2015.7354714

Scopus

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.6109/jicce.2015.13.4.270

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.6109/jicce.2015.13.4.275

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   EXCO, Daegu   2015年08月18日  -  2015年08月21日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   EXCO, Daegu   2015年08月18日  -  2015年08月21日

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   EXCO, Daegu   2015年08月18日  -  2015年08月21日

担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2015, The Optical Society of Japan.A new handheld blood flow measurement system using laser speckle flowgraphy was developed for easy measurement of blood flow. The developed system features a small display unit that allows measurement results to be viewed without a PC. The system is miniaturized, integrated with a microcontroller, a line sensor, and a laser unit. Our experiment was carried out to confirm the usefulness of the developed system to measure the blood flow variation.

DOI： 10.1007/s10043-015-0062-0

Scopus

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2014 IEEE.We developed a portable blood flow measurement system for the elderly to determine their health conditions. This system captures images and converts them into numbers using the laser speckle phenomenon. The measurement system includes a microcontroller, line sensor, laser unit, lens, and liquid crystal display unit. In addition, we experimented by measuring blood flow before and after exercise, to objectively determine the effect of exercise, and determine the patients' health condition.

DOI： 10.1109/ICTC.2014.6983208

Scopus

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOREA   EXCO, Daegu   2014年08月26日  -  2014年08月29日

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2014 The Korean Information Display Society.In this paper, a three-dimensional photon counting optical encryption technique with occlusion layers of the primary information is suggested. In the optical encryption including double-random-phase encryption, the encryption and decryption processes are simple and fast. The technique can provide greater security by using the sparse detection of photons in photon counting imaging for the amplitude of the encrypted data and the depth range information for the occlusion layers of the primary information. Preliminary experiments were conducted to show that the suggested technique has greater security.

DOI： 10.1080/15980316.2014.950351

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Korea   Daejeon ETRI  

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Korea   Yoesu  

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

A new blood flow measurement system using Laser Speckle Flowgraphy was developed to measure the blood flow easily. The measurement system loads a small display unit to view the results of the measurements without PC. In addition, the system consists of a microcontroller, line sensor, laser unit. We integrated these devices into the system so that the system was miniaturized. We made an experiment of measuring blood flow value by the system. © 2013 IEEE.

DOI： 10.1109/ICTC.2013.6675526

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

記述言語：英語   掲載種別：研究論文（学術雑誌）

Thirty-seven species of common seaweeds from the coast of Korea were screened for anti-inflammatory activity. Methanol extracts of the seaweeds were tested against mouse ear edema and erythema induced by phorbol myristate acetate. At 40 mg ml-1 of extract, edema was strongly suppressed by the seaweeds Undaria pinnatifida and Ulva linza, with relative inhibition of 85 and 84%, respectively. These two seaweeds also showed the greatest suppression of erythema, with inhibition of 78 and 70%, respectively. IC50, values of U. pinnatifida were 10, 15, and 18 mg ml-1 when inflammation symptoms of edema, erythema, and blood flow, respectively, were measured. The IC50 of U. linza was 20, 26, and 31 mg ml-1 when edema, erythema, and blood flow, respectively, were measured. A linear correlation among inhibition rates of edema, erythema, and blood flow was observed with high confidence. © Triveni Enterprises, Lucknow (India).

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

The brown seaweed Undaria pinnatifida (Harvey) Suringar produced potent inhibition of erythematous inflammation assessed using digital photo analysis. The analysis technique was validated by laser speckle flowgraphy and blood vessel contraction. The methanol extract suppressed erythema by 50% when applied within 1 h before or 15 min after application of phorbol myristate acetate. Erythema reduction to half-maximal values took 12 h with the extract, compared with 25 h with the vehicle. The blade part of the thallus showed the highest activity, while the northern type of U. pinnatifida had slightly higher activity than the southern type. The active constituents were stearidonic acid and eicosapentaenoic acid. These findings reinforce the claims of the health care industry and indigenous medicine that U. pinnatifida can be used as a health food and remedy for inflammation-related symptoms. Copyright © 2008 John Wiley & Sons, Ltd.

DOI： 10.1002/ptr.2349

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

Dichloromethane, ethanol, and boiling water extracts of the brown seaweeds Sargassum fulvellum and Sargassum thunbergii were examined for antipyretic, analgesic, and anti-inflammatory activities in mice. The activities were evaluated against yeast-induced pyrexia, tail-flick test, and phorbol myristate acetate-induced inflammation (edema, erythema, and blood flow). The dichloromethane extract (0.4 mg/ear) of Sargassum fulvellum inhibited an inflammatory symptom of mouse ear edema by 79.1%. The ethanol extract (0.4 mg/ear) of Sargassum thunbergii also inhibited edema by 72.1%. No acute toxicity was observed after p.o. administration of each extract (5 g/kg bw). These findings are consistent with various claims that these seaweeds can be used as remedies for inflammation-related symptoms. © 2007 Elsevier Ireland Ltd. All rights reserved.

DOI： 10.1016/j.jep.2007.10.032

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

Two anti-inflammatory ω-3 polyunsaturated fatty acids (PUFAs) of stearidonic acid (SA) and eicosapentaenoic acid (EPA) and one pro-inflammatory ω-6 PUFA of arachidonic acid (AA) were isolated from the edible brown seaweed Undaria pinnatifida. SA was active against mouse ear inflammation induced by phorbol myristate acetate, with IC50 values of 160, 314, and 235 μg per ear for edema, erythema, and blood flow, respectively. EPA was also active against edema, erythema, and blood flow, with IC50 values of 230, 462, and 236 μg per ear, respectively. Although AA at low concentrations showed anti-inflammatory activities when measured 10 h later, AA doses of more than 243 μg per ear induced inflammatory symptoms 1 h later. Mature thalli generally had larger amounts of PUFAs than young thalli. The algal blade contained more ω-3 PUFAs than were found in other parts, while the holdfast contained extremely high amounts of AA. Late-season thalli showed increased amounts of PUFAs, especially AA. © 2007 American Chemical Society.

DOI： 10.1021/jf071791s

Scopus

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

記述言語：英語   掲載種別：研究論文（学術雑誌）

代表的研究業績

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

KOBE   2007年03月26日  -  2007年03月31日

記述言語：日本語   掲載種別：研究論文（研究会，シンポジウム資料等）

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/10018703851

記述言語：日本語   掲載種別：研究論文（学術雑誌）

DOI： 10.2184/lsj.35.221

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/130004465843

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

China   Gulin   2006年11月24日  -  2006年11月26日

記述言語：日本語   掲載種別：研究論文（研究会，シンポジウム資料等）

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/10018244508

記述言語：日本語   掲載種別：研究論文（研究会，シンポジウム資料等）

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/10018244502

記述言語：日本語   掲載種別：研究論文（学術雑誌）

<p>レーザースペックル現象を利用した血流分布画像化システム(レーザースペックルフローグラフィー)は，新しい画像診断装置として，眼科を中心に過去十数年にわたってさまざまな装置が開発されてきた．この装置は生体表面の血流変動を実時間で動画として観察でき，特定部位の血流が処置前後でどの程度変化しているかを定量的に読み取ることができる．眼科用の装置は開発当初，測定面積が眼底上で1mm² にも達していなかったので，主に動物実験に利用されていたが，近年測定面積が飛躍的に広がり，臨床に利用できる性能に到達しつつある．従来までは，眼底血流の診断は造影剤を静注する方法しかなかったが，簡便に繰り返し測定できる本装置のメリットを生かした臨床研究が，すでに始まっている．</p>

DOI： 10.11470/oubutsu.75.6_699

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/10019172528

記述言語：日本語   掲載種別：研究論文（研究会，シンポジウム資料等）

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/110006214744

記述言語：日本語   掲載種別：研究論文（学術雑誌）

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/10016883423

記述言語：日本語   掲載種別：研究論文（学術雑誌）

代表的研究業績

記述言語：日本語   掲載種別：研究論文（学術雑誌）

2種類のレーザースペックルフローグラフィーシステムについて報告する．一つは皮膚などの末梢循環を可視化するもの，もう一つはより小さい領域例えば眼底の血流分布を解析するものである．前者については線状のレーザースポットを生体組織の表面に照射し，その線状スポットで組織表面を横切るように走査する．このスポットの像面にラインセンサーを置く．センサーからの信号をPCに取り込み，連続する2回の走査の差を計算することで，60mm角の領域の血流マップを数秒間の測定時間のうちに200×200画素の解像度で表示できる．同様に眼底を半導体レーザースポットで照明し，このスポットを眼底カメラを通して結像した面にCCDカメラを置いて走査する．100画面以上のスペックル画像をPCに取り込み，強度変化のブレ率を各画素ごとに算出する．演算結果を二次元のカラーマップで表示すれば，眼底の血流マップをリアルタイムで観察できる．これらのシステムの種々の応用例も紹介する．

DOI： 10.2530/jslsm.26.266

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/130004491961

記述言語：日本語   掲載種別：研究論文（研究会，シンポジウム資料等）

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/10014031761

記述言語：日本語   掲載種別：研究論文（研究会，シンポジウム資料等）

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/10014031749

記述言語：日本語   掲載種別：研究論文（研究会，シンポジウム資料等）

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/10014031753

記述言語：日本語   掲載種別：研究論文（研究会，シンポジウム資料等）

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/10014031741

担当区分：責任著者   記述言語：日本語   掲載種別：研究論文（研究会，シンポジウム資料等）

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/10013226224

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Chiba   2004年07月12日  -  2004年07月15日

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/10011841773

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

A new version of the Laser Speckle Flowgraphy was developed to study the dependence of the blood flow of the skin tissue under the sacrum and the supporting pressure against the sacrum. The measuring unit consists of the laser diode, imaging system, line sensor, scanning mirror, and one-board microcomputer. The speckle signal is analyzed and sent to a personal computer, where the blood flow in a tissue area of 19 cm × 25 cm is evaluated and displayed on a 2-D color map. It was found that the blood flow in the skin tissue sharply decreased under the sacrum when it was supported by a hard surface, while the decrease became negligible when the surface was replaced by a soft airbag.

DOI： 10.1007/s10043-003-0562-1

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=1842530845&origin=inward

記述言語：日本語   掲載種別：研究論文（その他学術会議資料等）

記述言語：日本語   掲載種別：研究論文（その他学術会議資料等）

担当区分：筆頭著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/10013014107

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