Dr. Ioannis Katsavounidis Profile

Dr. Ioannis Katsavounidis

Research Scientist

SPIE Involvement:

Conference Program Committee | Author

Publications (17)

Proceedings Article | 30 September 2024 Open Access

Benchmarking hardware and software encoder quality and performance

Hassene Tmar, Ping-Hao Wu, Cosmin Stejerean, Zhijun Lei, Ioannis Katsavounidis

Proceedings Volume 13137, 131370W (2024) https://doi.org/10.1117/12.3031754

KEYWORDS: Video coding, Video, Power consumption, Energy efficiency, Video compression, Open source software, Scalable video coding, Video processing, Clocks

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Proceedings Article | 4 October 2023 Open Access

Efficient video processing at scale using MSVP

H. Reddy, Y. Chen, J. Lan, I. Katsavounidis, B. Anandharengan, H. Lalgudi, S. Alaparthi, G. Hua, H.-C. Chuang, P.-H. Wu, Z. Lei, A. Mastro, C. Petersen, G. Chaudhari, P. Prakash, S. Regunathan, S. Reddy, P. Venkatapuram, V. Rao, K. Noru, A. Bjorlin, M. Zeile, A. Lewis, A. Singh, A. Sunil, C.-C. Chen, C.-F. Lin, C. Chen, D. Sundar, D. Jayaraman, H. Ucar, H. Li, J. Singh, J. C. Liu, K. Rachamreddy, K. Sriadibhatla, K. Datla, L. V. Berg, L. Feng, P. Jampani, R. Moola, R. Mallya, S. Jha, S. Pan, S. Srinivasan, V. Vaduganathan, X. Zha, Z. Wang, A. Sengottuvel, B. Alluri, B. Oshin, C. Kanumetta, E. Sahin, J. Athaide, J. Wu, K. Kurapati, K. Manthati, K. Thottempudi, R. Chennamsetti, K. Jagannath, S. Arvapalli, T. Kala, T. Wang, P. Chopda, K. Gandhi, A. Ramesh, R. Gupta, S. Fadnavis, A. Qassoud, C. Friedt, F. Li, H. Gao, J. Lee, M. Dixit, S. Ugaji, T. Karuturi, X. Xie, A. Narasimha, B. Jakka, B. Dodds, J. Yang, K. Skandakumaran, M. Modi, P. Modi, C. Stejerean, D. Ronca, H. Wang, N. Pham, L. Lu, H. Shen, J. Ning, K. Narayanan, L. Chen, N. Avidan, W. Arnold, F. Xu, G. Patil, V. Balan, S. Grandhi

Proceedings Volume 12674, 1267414 (2023) https://doi.org/10.1117/12.2685875

KEYWORDS: Video processing

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Proceedings Article | 3 October 2022 Presentation + Paper

Green image codec: a lightweight learning-based image coding method

Yifan Wang, Zhanxuan Mei, Qingyang Zhou, Ioannis Katsavounidis, C.-C. Jay Kuo

Proceedings Volume 12226, 122260A (2022) https://doi.org/10.1117/12.2633475

KEYWORDS: Image compression, Quantization, Spatial resolution, Image enhancement, Computer programming, Switches, Dimension reduction, Data modeling, Visual system, Video compression

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Proceedings Article | 3 October 2022 Presentation + Paper

Benchmarking and analysis of AV1 software decoding on Android devices

Janne Grunau, Jean-Baptiste Kempf, Martin Storsjo, Jeeva Raj A., Kaustubh Patankar, Mukund Srinivasan, Ronald Bultje, Henrik Gramner, Luc Trudeau, Victorien Le Couviour Tuffet, Zhijun Lei, Ioannis Katsavounidis, David Ronca

Proceedings Volume 12226, 122260T (2022) https://doi.org/10.1117/12.2633692

KEYWORDS: Video, Mobile devices, Video acceleration, Computer programming, Video coding, System on a chip, Video compression

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AV1 is the first generation of royalty-free video coding standards developed by the Alliance for Open Media (AOM). Since it was released in 2018, it has gained great adoption in the industry. Major services providers, such as YouTube and Netflix, have started streaming AV1 encoded content. Even though more and more vendors have started to implement HW AV1 decoders in their products, to enable AV1 playback on a broader range of devices, especially mobile devices, software decoders with very good performance are still critical. For this purpose, VideoLAN created Dav1d, a portable and highly optimized AV1 software decoder. The decoder implements all AV1 bitstream features. Dataflow is organized to allow various decoding stages (bitstream parsing, pixel reconstruction and in-loop postfilters) to be executed directly after each other for the same superblock row, allowing memory to stay in cache for most common frame resolutions. The project includes more than 200k lines of platformspecific assembly optimizations, including Neon optimizations for arm32/aarch64, as well as SSE, AVX2 (Haswell) and AVX512 (Icelake/Tigerlake) for x86[3] to create optimal performance on most popular devices. For multi-threading, Dav1d uses a generic task-pool design, which splits decoding stages in mini-tasks. This design allows multiple decoding stages to execute in parallel for adjacent tiles, superblock rows and frames, and keeps common thread-counts (2-16) efficiently occupied on multiple architectures with minimal memory or processing overhead. To test the performance of Dav1d on real devices, a set of low-end to high-end android mobile devices are selected to conduct benchmarking tests. To simulate real-time playback with display, VLC video player application with dav1d integration is used. Extensive testing is done using a wide range of video test vectors at various resolutions, bitrates, and framerates. The benchmarking and analysis are conducted to get the insights of single and multithreading performance, impact of video coding tools, CPU utilization and battery drain. Overall AV1 real-time playback of 720p 30fps @ 2Mbps is feasible for low-end devices with 4 threads and 1080p 30fps @ 4Mbps is feasible for high-end and mid-range devices with 4 threads using Dav1d decoder.

Proceedings Article | 1 August 2021 Presentation + Paper

Machine-learning-based tuning of encoding parameters for UGC video coding optimizations

Gaurang Chaudhari, Igor Koba, Ioannis Katsavounidis, Harikrishna Reddy

Proceedings Volume 11842, 1184208 (2021) https://doi.org/10.1117/12.2595404

KEYWORDS: Computer programming, Video, Video coding, Data modeling, Statistical modeling, Quantization, Machine learning, Statistical analysis, Principal component analysis, Video compression, Video processing, Low bit rate video

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Proceedings Article | 1 August 2021 Presentation + Paper

DCST: a data-driven color/spatial transform-based image coding method

Yifan Wang, Zhanxuan Mei, Ioannis Katsavounidis, C.-C. Jay Kuo

Proceedings Volume 11842, 118420P (2021) https://doi.org/10.1117/12.2595293

KEYWORDS: Quantization, Principal component analysis, Image compression, Machine learning, Visualization, Modulation transfer functions, Visual system

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Proceedings Article | 1 August 2021 Open Access

Towards much better SVT-AV1 quality-cycles tradeoffs for VOD applications

Ping-Hao Wu, Ioannis Katsavounidis, Zhijun Lei, David Ronca, Hassene Tmar, Omran Abdelkafi, Colton Cheung, Foued Ben Amara, Faouzi Kossentini

Proceedings Volume 11842, 118420T (2021) https://doi.org/10.1117/12.2595598

KEYWORDS: Computer programming, Video, Video coding, Video processing, Platinum, Ultrafast phenomena, Standards development, Spatial resolution, Optimization (mathematics), Image processing

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Proceedings Article | 21 August 2020 Presentation + Paper

Efficient measurement of quality at scale in Facebook video ecosystem

Shankar Regunathan, Haixiong Wang, Yun Zhang, Yu (Ryan) Liu, David Wolstencroft, Srinath Reddy, Cosmin Stejerean, Sonal Gandhi, Minchuan Chen, Pankaj Sethi, Amit Puntambekar, Mike Coward, Ioannis Katsavounidis

Proceedings Volume 11510, 115100J (2020) https://doi.org/10.1117/12.2569920

KEYWORDS: Video, Computer programming, Video compression, Video processing, Video coding, Quality measurement

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Proceedings Article | 21 August 2020 Presentation + Paper

Fast encoding parameter selection for convex hull video encoding

Ping-Hao Wu, Volodymyr Kondratenko, Ioannis Katsavounidis

Proceedings Volume 11510, 115100Z (2020) https://doi.org/10.1117/12.2567502

KEYWORDS: Computer programming, Video, Video coding, Video compression, Standards development, Internet, Distortion, Quantization

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Proceedings Article | 17 September 2018 Presentation + Paper

A user model for JND-based video quality assessment: theory and applications

Haiqiang Wang, Ioannis Katsavounidis, Xinfeng Zhang, Chao Yang, C.-C. Jay Kuo

Proceedings Volume 10752, 107520M (2018) https://doi.org/10.1117/12.2320813

KEYWORDS: Video, Data modeling, Video compression, Distortion, Video coding

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Proceedings Article | 17 September 2018 Presentation + Paper

Video codec comparison using the dynamic optimizer framework

Ioannis Katsavounidis, Liwei Guo

Proceedings Volume 10752, 107520Q (2018) https://doi.org/10.1117/12.2322118

KEYWORDS: Convex optimization, Video, Video coding, Video compression, Quantization, Image resolution, Linear filtering

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Proceedings Article | 22 September 2015 Paper

Experimental design and analysis of JND test on coded image/video

Joe Yuchieh Lin, Lina Jin, Sudeng Hu, Ioannis Katsavounidis, Zhi Li, Anne Aaron, C.-C. Jay Kuo

Proceedings Volume 9599, 95990Z (2015) https://doi.org/10.1117/12.2188389

KEYWORDS: Video, Visualization, Image quality, Image compression, Video coding, Fourier transforms, Video compression, Visual compression, Quantization, Analytical research

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Proceedings Article | 27 February 1996 Paper

Hierarchical weighted vector quantization (HWVQ) for embedded wavelet coding

Ioannis Katsavounidis, C.-C. Jay Kuo

Proceedings Volume 2727, (1996) https://doi.org/10.1117/12.233270

KEYWORDS: Wavelets, Quantization, Image compression, Wavelet transforms, Image quality, Distortion, Computer programming, Image filtering, Signal processing, Image processing

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Proceedings Article | 1 September 1995 Paper

Image compression with embedded wavelet coding via vector quantization

Ioannis Katsavounidis, C.-C. Jay Kuo

Proceedings Volume 2569, (1995) https://doi.org/10.1117/12.217588

KEYWORDS: Wavelets, Quantization, Wavelet transforms, Image compression, Transform theory, Linear filtering, Image filtering, Image quality, Distortion, Computer programming

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Proceedings Article | 3 March 1995 Paper

Fast generalized Lloyd iteration for VQ codebook design

Ioannis Katsavounidis, C.-C. Jay Kuo, Zhen Zhang

Proceedings Volume 2418, (1995) https://doi.org/10.1117/12.204118

KEYWORDS: Distortion, Computer programming, Data compression, Detection and tracking algorithms, Quantization, Algorithm development, Algorithms, Image compression, Pattern recognition, Error analysis

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Proceedings Article | 21 September 1994 Paper

Multiscale error-diffusion digital halftoning with local intensity quality measure

Ioannis Katsavounidis, Yu-Chuan Lin, C.-C. Jay Kuo

Proceedings Volume 2298, (1994) https://doi.org/10.1117/12.186534

KEYWORDS: Diffusion, Quantization, Image resolution, Quality measurement, Image processing, Raster graphics, Image quality, Error analysis, Imaging arrays, Visualization

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Proceedings Article | 22 October 1993 Paper

Recursive multiscale error-diffusion technique for digital halftoning

Ioannis Katsavounidis, C.-C. Jay Kuo

Proceedings Volume 2094, (1993) https://doi.org/10.1117/12.157968

KEYWORDS: Diffusion, Quantization, Image filtering, Printing, Raster graphics, Error analysis, Image processing, Imaging arrays, Nonimpact printing, Binary data

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