Curriculum Vitaes
Profile Information
- Affiliation
- Associate Professor, Department of Information and Communication Sciences, Faculty of Science and Technology, Sophia University
- Degree
- Doctor of Philosophy in Computer Science(Sep, 2012, Chiba University)Master of Engineering(Mar, 2008, Chiba University)
- Contact information
- kameda
sophia.ac.jp - Researcher number
- 50711553
- ORCID ID
https://orcid.org/0000-0001-8503-4098- J-GLOBAL ID
- 200901044504595965
- Researcher ID
- OOK-3953-2025
- researchmap Member ID
- 6000014798
- External link
Natural science is a way to clarify what is possible or impossible, and engineering is scientific manufacturing. Among them, computer science is a discipline that regards all phenomena and things as a calculation process. Let's study together to acquire specialized knowledge and skills and provide new value to the world.
My major is image processing, especially video motion and flow estimation. Motion and flow information estimated from images is expected to be widely applied to object recognition by computers, self-position estimation and obstacle detection of robots and cars, and fluid measurement and analysis. We are conducting research to estimate motion with high speed and high accuracy. In addition to research, we also teach practical ICT technologies such as programming and server management.
Research Interests
13Research Areas
5Research History
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Apr, 2021 - Mar, 2025
Education
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Apr, 2006 - Sep, 2012
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Apr, 2005 - Mar, 2006
Major Committee Memberships
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Apr, 2023 - Mar, 2024
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Apr, 2020 - Mar, 2021
Major Awards
27Papers
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Journal of Electronic Imaging, 34(04) 1-11, Jul 21, 2025 Peer-reviewedLast authorCorresponding author
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NCSP'25: RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing, 217-220, Feb, 2025 Peer-reviewedLast author
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NCSP'25: RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing, 213-216, Feb, 2025 Peer-reviewedLast authorCorresponding author
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NCSP'25: RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing, 210-212, Feb, 2025 Peer-reviewedLast author
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Proceedings of the 43rd IEEE International Conference on Consumer Electronics (ICCE 2025), 1-4, Jan, 2025 Peer-reviewedLast author
Misc.
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第31回画像符号化シンポジウム(PCSJ 2016)・第21回映像メディア処理シンポジウム(IMPS 2016)予稿集, 31st-21st P-2-17, 94-95, Nov, 2016
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第31回画像符号化シンポジウム(PCSJ 2016)・第21回映像メディア処理シンポジウム(IMPS 2016)予稿集, 31st-21st P-1-21, 60-61, Nov, 2016
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The International Conference on Electrical Engineering (ICEE) 2016 Proceedings, (90413) 1-2, Jul, 2016
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Proceedings of the IEICE General Conference, 2016(2) 9-9, Mar 1, 2016
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Proceedings of the IEICE General Conference, 2016(2) 28-28, Mar 1, 2016
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Proceedings of the IEICE General Conference, 2016(2) 46-46, Mar 1, 2016
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Proceedings of the IEICE General Conference, 2016(2) 27-27, Mar 1, 2016
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D-11-45 Bi-directional Intra Prediction along Circular Curves for DCT Based Progressive Image CodingProceedings of the IEICE General Conference, 2016(2) 45-45, Mar 1, 2016
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Proceedings of the IEICE General Conference, 2016(2) 44-44, Mar 1, 2016
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115(350) 141-145, Dec 3, 2015
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39(47) 141-145, Dec, 2015
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Proceedings of the IEICE General Conference, 2015(2) 40-40, Feb 24, 2015
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D-11-41 Performance Improvement of Intra Prediction by Combining Recursive and Non-recursive MethodsProceedings of the IEICE General Conference, 2015(2) 41-41, Feb 24, 2015
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Proceedings of the IEICE General Conference, 2015(2) 42-42, Feb 24, 2015
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ITE Winter Annual Convention, (2014) 4-9-1"-"4-9-1", Dec 17, 2014
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第29回画像符号化シンポジウム(PCSJ 2014)予稿集, P2-03, 28-29, Nov, 2014
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Proceedings of the ... ITE annual convention, (2014) 18-9-1"-"18-9-2", Sep 1, 2014This paper proposes a spatially scalable image coding scheme based on a non-linear image resizing technique called seam carving. In this scheme, the original size image is reconstructed from the reduced size one with a help of side information including paths of the removed seams. To reduce the amount of the side information, evenly spaced multiple seams are removed simultaneously at the resizing stage.
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Proceedings of the IEICE General Conference, 2014(2) 59-59, Mar 4, 2014
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Proceedings of the IEICE General Conference, 2014(2) 62-62, Mar 4, 2014
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Proceedings of the IEICE General Conference, 2014(2) 12-12, Mar 4, 2014
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PROCEEDINGS OF THE ITE ANNUAL CONVENTION, 2014 17-10-1_-_17-10-2_, 2014In this paper, we propose a rotation invariant method for human detection from top view images. In the method, local features based on Histogram of Oriented Gradients (HOG) are defined based on polar coordinates. In addition, two dimensional histograms are calculated from pairs of neighboring pels to enhance robustness against small rotation.
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PROCEEDINGS OF THE ITE ANNUAL CONVENTION, 2014 3-9-1_-_3-9-2_, 2014We previously proposed a semi-automatic 2D-3D conversion method for still images. The method propagates depth information, which is partially given by the user as an input, to a whole image based on local similarity of image values. Therefore, the propagation process must be sufficiently fast for interactive operation. In this paper, we accelerate this process by using a kind of distance transform.
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PROCEEDINGS OF THE ITE ANNUAL CONVENTION, 2014 18-3-1_-_18-3-2_, 2014This paper describes a new intra prediction method which is designed to exploit inter-block correlations for DCT based image coding. By changing a coding process of DCT coefficients from block-wise order to coefficient-wise one, the method can benefit from interpolative prediction in almost all blocks.
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PROCEEDINGS OF THE ITE ANNUAL CONVENTION, 2014 18-10-1_-_18-10-2_, 2014We previously proposed a block-adaptive spatio-temporal prediction method for video coding. In this method, multiple predictors that minimize sum of squared errors are designed for each frame. However, such a least squares approach does not necessarily improve the coding performance. In this paper, we introduce a DCT domain soft shrinkage process to reduce the number of non-zero DCT coefficients to be encoded.
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PROCEEDINGS OF THE ITE WINTER ANNUAL CONVENTION, 2014 2-6-1_-_2-6-2_, 2014
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PROCEEDINGS OF THE ITE WINTER ANNUAL CONVENTION, 2014 2-5-1_-_2-5-2_, 2014
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PROCEEDINGS OF THE ITE WINTER ANNUAL CONVENTION, 2014 2-9-1_-_2-9-1_, 2014
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PROCEEDINGS OF THE ITE WINTER ANNUAL CONVENTION, 2014 2-7-1_-_2-7-1_, 2014
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PROCEEDINGS OF THE ITE ANNUAL CONVENTION, 2014 3-8-1_-_3-8-2_, 2014For the purpose of user interface or marketing, estimation of gaze directions by a noncontact measurement device has been studied in recent years. This paper describes an eigenspace-based method which estimates horizontal and vertical angles of the gaze directionfrom eye region images.
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Proceedings of the ... ITE annual convention, (2013) 17-2-1-"17-2-2", Aug 28, 2013As an efficient way for archiving the existing video contents compressed by the old standard, we are developing a lossless re-encoding scheme for MPEG-1 video. In this paper, simplified probability models used for arithmetic coding of DCT coefficients are investigated to reduce computation time needed for our coding scheme.
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Proceedings of the ... ITE annual convention, (2013) 17-5-1-"17-5-2", Aug 28, 2013This paper proposes an efficient lossless coding method for color quantized images each of which consists of an array of indices and corrsponding RGB values of representative colors. In the conventional methods, predictive coding techniques developed for lossless image coding are often applied to the array of indices. On the other hand, our method directly predicts a 3D position of each index in a RGB color space to accurately estimate its occurrence probability.
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Proceedings of the ... ITE annual convention, (2013) 17-3-1-"17-3-2", Aug 28, 2013We previously proposed a new type of lossy image coding scheme whose compressed data can be losslessly converted into JPEG bitstreams. In this paper, perceptual image quality of our coding scheme is improved by taking account of spatial frequency characteristics of the human visual system. Results of our subjective quality assessment test demonstrate that perceptual quality of the reconstructed images is certainly improved.
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Proceedings of the ... ITE annual convention, (2013) 3-5-1-"3-5-2", Aug 28, 2013We propose a stable computation scheme for variational scene-flow computation. Scene flow is a velocity field on a stereo image sequence and represents apparent motions and disparity changes. The stability condition of the proposed scheme is independent of images and regularization coefficients in the variational problem.
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Proceedings of the ... ITE annual convention, (2013) 13-2-1-"13-2-2", Aug 28, 2013We previously proposed a lossy coding scheme based on recursive-type intra prediction and discrete sine transform (DST) for monochrome still images. In this paper, we extend the scheme to RGB 4:4:4 format color images. In order to exploit intra- and inter-color correlations, the already encoded color signals are simultaneously used in the prediction process.
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Proceedings of the ... ITE annual convention, (2013) 11-2-1-"11-2-2", Aug 28, 2013Recently, the coding technology of multi-view video plus depth has been developed to implement 3D video applications such as Free Viewpoints Television. Because depth maps tend to have smooth value within an object and have strong edges between objects, it is efficient to encode depth maps by a region-oriented manner. In this paper, we introduce a segmentation method based on Voronoi diagrams to reduce the amount of information on the region shapes. Moreover, we propose a plane approximation to the depth values in each region.
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Proceedings of the ... ITE annual convention, (2013) 13-1-1-"13-1-2", Aug 28, 2013In the previous work, we proposed a lossless coding method which dynamically models probability density function (PDF) of image values pel-by-pel. In this method, the PDF model is defined as sum of the generalized Gaussian functions (GGFs) whose peak positions are given by examples collected from causal neighbors. However, the shapes of the GGFs were fixed for each image. In this paper, we introduce a technique of context modeling to adaptively control the respective shapes.
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PROCEEDINGS OF THE ITE WINTER ANNUAL CONVENTION, 2013 13-5, 2013Directional intra prediction currently used in H.264/AVC and H.265/HEVC is unsuitable for curved textures because predicted values are always extrapolated along straight lines in a given direction. In this paper, we propose a new prediction technique which enables interpolative prediction along circular curves defined by two kinds of parameters.
Presentations
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情報・医療・環境 新技術説明会, Aug 28, 2025, 科学技術振興機構 Invited画素ごとに非同期かつ疎に記録される明暗変化イベントは通常の映像フレームとは異なる情報であり、見かけの動き推定手法も異なる。本技術は、イベント点群の軌跡から得られる時空間平面がフレーム画像の輝度勾配に対応することを示し、従来のフレーム向け推定技術をイベントカメラにも適用可能とするものである。
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The 3rd Collaborative Symposium on Science and Engineering by the Faculties of Kwansei Gakuin University & Sophia University: 'Perception and Interaction' as Frontiers in Information Science, Feb 26, 2024, Science and Engineering Faculties of Kwansei Gakuin University & Sophia University Invited
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The 3rd Digital Imaging Technology Subcommittee Seminar of the 2023 Fiscal Year, Feb 14, 2024, Japan Optomechatronics Association InvitedSeveral studies on video processing using stereo cameras, depth cameras, event cameras, as well as special image sensors will be presented.
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The 2022 IEICE General Conference, Mar 17, 2022 Invited
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A Study on Side-Information Reduction in SSIM-Optimal Post Filtering for Coding Artifact Elimination映像情報メディア学会冬季大会講演予稿集(CD-ROM), Dec, 2021
Major Teaching Experience
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Apr, 2022 - PresentMaster's Thesis Tutorial and Exercise (Sophia University)
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Sep, 2021 - PresentInformation Fluency (C Programming) (Sophia University)
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Sep, 2021 - PresentBasic Informatics (Sophia University)
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Sep, 2021 - PresentImage Processing Technology (Sophia University)
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Apr, 2021 - PresentGraduation Research (Sophia University)
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Apr, 2021 - PresentVisual Media Processing (Sophia University)
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Apr, 2021 - PresentInformation Fluency (Python Programming) (Sophia University)
Professional Memberships
14-
2020 - Present
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2020 - Present
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2019 - Present
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2017 - Present
Works
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Feb 23, 2022 Software
Major Research Projects
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科学研究費助成事業, 日本学術振興会, Apr, 2024 - Mar, 2028
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Sophia University Special Grant for Academic Research, Sophia University, Aug, 2023 - Mar, 2026
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科学研究費助成事業, 日本学術振興会, Apr, 2020 - Mar, 2024
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Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Japan Society for the Promotion of Science, Apr, 2017 - Mar, 2023
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2016 - Mar, 2019
Industrial Property Rights
1Media Coverage
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Tokyo University of Science, https://www.tus.ac.jp/en/mediarelations/archive/20210510_0987.html, May, 2021 Internet