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Conference on Applications of Digital Image Processing XLI

作者： Saidi, Ines Zhang, Lu Barriac, Vincent Deforges, Olivier Orange Labs Lannion Lannion France INSA Rennes CNRS UMR 6164 IETR Rennes France

ISBN: (数字)9781510620766

ISBN: (纸本)9781510620766

Offering the best Quality of Experience (QoE) is the challenge of all the video conference service providers. In this context it is essential to identify the representative metrics to monitor the video quality. In this paper, we present Machine Learning techniques for modeling the dependencies of different video impairments to the global video quality perception using subjective quality feedback. We investigate the possibility of combining no-reference single artifact metrics in a global video quality assessment model. The obtained model has an accuracy of 63% of correct prediction.

关键词： QoE video quality video coding and transmission no reference metric Machine Learning

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The technology behind the exceptional visual experience via high dynamic range

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APSIPA TRANSACTIONS ON SIGNAL AND INFORMATION PROCESSING 2018年第1期7卷

作者： Gadgil, Neeraj J. Song, Qing Su, Guan-Ming Hulyalkar, Samir N. Dolby Labs Inc 432 Lakeside Dr Sunnyvale CA 94085 USA

High dynamic range (HDR) technology is rapidly changing today's video landscape by offering spectacular visual experiences. The development in display technology to support higher luminance levels for commercial and consumer electronic devices such as TVs, smartphones, projectors etc., has created an exponential demand for delivering HDR content to viewers. The essential component of the HDR technology is "expanded contrast", which allows richer black levels and enhanced brightness, providing dramatic contrast that reveals finer details. The use of "wide color gamut" allows wider color spectrum and richer colors providing aesthetically pleasing true-to-life feel. Such visual enhancements clearly establish HDR as one of the most significant upcoming video technologies. In this paper, we review major technical advances in this exciting field of study. Quantization of HDR signals is reviewed in the context of transfer functions that convert optical signals to electrical signals and vice versa. They mainly consist of Perceptual Quantization and Hybrid-Log-Gamma approaches. Compression of HDR content is another broad area of study involving several coding approaches, often categorized in terms of backward-compatibility and single/dual layer methods. Some key industry applications of HDR processing systems are also discussed, followed by some future directions of HDR technology.

关键词： High dynamic range (HDR) video Signal quantization video coding and transmission video display technology

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A MULTI-CAMERA MOTION CAPTURE SYSTEM FOR REMOTE HEALTH CARE MONITORING

A MULTI-CAMERA MOTION CAPTURE SYSTEM FOR REMOTE HEALTH CARE ...

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IEEE International Conference on Multimedia and Expo Workshops (ICMEW)

作者： Ye, Yun Ci, Song Katsaggelos, Aggelos K. Liu, Yanwei Univ Nebraska Lincoln Dept Comp & Elect Engn Lincoln NE 68588 USA Chinese Acad Sci Inst Acoust Beijing Peoples R China Northwestern Univ Dept Elect Engn & Comp Sci Evanston IL USA

ISBN: (纸本)9781479900152

This paper presents a multi-camera motion capture system aiming to provide caregivers with timely access to the patient's health status through mobile communication devices. The major components include video capture, object detection, video coding and transmission, error concealment, and video analysis. Our contribution is twofold. First, several novel ideas are developed, including fast object detection, and content-aware and adaptive video coding and transmission. Second, all components are seamlessly integrated in a unified optimization framework dedicated for online data transmission. In the scenario, the subject walked on a treadmill with four tripod cameras capturing the video from different viewpoints. After video compression and transmission over a wireless sensor network, the remote receiver recovered the videos and performed multi-view motion capture for gait analysis. Experimental results show that the presented system design achieves better video quality than traditional video coding and transmission scheme, while the requirement for a low-cost, noninvasive and real-time healthcare monitoring system is accommodated.

关键词： Healthcare monitoring object detection video coding and transmission multi-view motion capture wireless communications

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Weighted Constrained One-Bit Transform Based Fast Block Motion Estimation

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IEEE TRANSACTIONS ON CONSUMER ELECTRONICS 2011年第2期57卷 751-755页

作者： Gullu, M. Kemal Kocaeli Univ Dept Elect & Telecommun Engn Kocaeli Univ Lab Image & Signal Proc KULIS TR-41380 Kocaeli Turkey

Block based motion estimation (ME) techniques based on low bit-depth representation have been proposed in the literature to reduce the computational complexity of ME. One-bit transform based ME methods are pioneers in this field. These methods derive one-bit images using an adaptive thresholding scheme, and perform block based ME on one-bit images using simplified matching criteria. Recently, constrained one-bit transform (C-1BT) based ME has been proposed to increase ME performance of 1BT based ME, restraining pixels with values close to the adaptive threshold throughout the matching. In this work, a weighted constraint strategy is proposed to increase the matching performance of C-1BT based ME. Instead of the one-bit constraint mask used in the literature, a two-bit constraint is computed according to the difference between a pixel and its 1BT threshold value, novel to this paper. Experimental results show that the proposed method improves the ME performance of C-1BT, and outperforms other low bit-depth based ME methods at macro-block level(1).

关键词： video coding and transmission Motion Estimation One-Bit Transform Block Matching

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Fading techniques for error concealment in block-based video decoding systems

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IEEE TRANSACTIONS ON BROADCASTING 2007年第1期53卷 286-296页

作者： Friebe, Markus Kaup, Andre Univ Erlangen Nurnberg Dept Multimedia Commun & Signal Proc D-91058 Erlangen Germany

Error concealment has a great importance within block-based video decoding systems especially for mobile transmission systems like DVB-T or DVB-H. In this paper, we propose a spatio-temporal and spatio-bi-temporal fading technique for recovering lost or erroneously received macroblock samples. For spatio-temporal fading based on a boundary error criterion obtained from temporal error concealment, either spatial, temporal, or fading of both methods is used for recovering lost image samples in one macroblock. A weighted absolute difference between well received macroblock boundary samples from the current frame and motion compensated macroblock boundary samples from the previous frame represents the boundary error. The weights;for fading are interpolated from the boundary error. For spatio-bi-temporal fading, one lost macroblock can individually be recovered pel-wise spatially from the current or bi-temporally from the previous and the future frame by weighted averaging three different estimations for the lost macroblock. The simulation results have shown that for concealing erroneously received uncompressed and compressed video data the proposed methods outperform the reference methods both in subjective and objective video quality.

关键词： error concealment video coding and transmission video restoration

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Spatio-temporal fading scheme for error concealment in block-based video decoding systems

Spatio-temporal fading scheme for error concealment in block...

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IEEE International Conference on Image Processing (ICIP 2006)

作者： Friebe, Markus Kaup, Andre Univ Erlangen Nurnberg Chair Multimedia Commun & Signal Proc Caurstr 7 D-91058 Erlangen Germany

ISBN: (纸本)9781424404810

In this contribution we propose a new spatio-temporal fading scheme for block loss recovery in block-based video decoding systems. Based on a boundary error criterion obtained from temporal error concealment, either spatial, temporal, or fading of both methods is used for recovering lost image samples in one macroblock. The weights for fading are interpolated from the boundary error. A weighted absolute difference between well received macroblock boundary samples from the current frame and motion compensated macroblock boundary samples from the previous frame represents the boundary error. It is shown, that in case of transmission errors this method can successfully be used for block loss recovery.

关键词： error concealment video restoration video coding and transmission

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Data compression and transmission aspects of panoramic videos

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR video TECHNOLOGY 2005年第1期15卷 82-95页

作者： Ng, KT Chan, SC Shum, HY Univ Hong Kong Dept Elect & Elect Engn Hong Kong Hong Kong Peoples R China Microsoft Res Asia Beijing 100080 Peoples R China

Panoramic videos are effective means for representing static or dynamic scenes along predefined paths. They allow users to change their viewpoints interactively at points in time or space defined by the paths. High-resolution panoramic videos, while desirable, consume a significant amount of storage and bandwidth for transmission. They also make real-time decoding computationally very intensive. This paper proposes efficient data compression and transmission techniques for panoramic videos. A high-performance MPEG-2-like compression algorithm, which takes into account the random access requirements and the redundancies of panoramic videos, is proposed. The transmission aspects of panoramic videos over cable networks, local area networks (LANs), and the Internet are also discussed. In particular, an efficient advanced delivery sharing scheme (ADSS) for reducing repeated transmission and retrieval of frequently requested video segments is introduced. This protocol was verified by constructing an experimental VOD system consisting of a video server and eight Pentium 4 computers. Using the synthetic panoramic video Village at a rate of 197 kb/s and 7 Vs, nearly two-thirds of the memory access and transmission bandwidth of the video server were saved under normal network traffic.

关键词： image-based rendering panoramic video video coding and transmission video-on-demand (VOD) virtual reality

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Enhancement layer rate control for high bitrate SNR scalable video coding

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JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION 2005年第2期16卷 159-179页

作者： Xie, J Chia, LT Nanyang Technol Univ Sch Comp Engn Div Comp Commun Singapore 639798 Singapore

Signal-to-noise ratio (SNR) scalability has been incorporated into the MPEG-2 video-coding standard to allow for the delivery of two services with the same spatial and temporal resolution but different levels of quality. Scalable video coding has many advantages, such as its capability of coping with bandwidth variations, high flexibility and so on. However, few accurate rate control schemes for enhancement layer coding have been proposed. In this paper, we will present a novel enhancement layer rate control scheme for MPEG-2 SNR scalable video coding. First, we will address the current necessity and problem of rate control for layered coding. Then through analyzing characteristics of compressed data in the enhancement layer, we will derive our rate control model. The proposed rate control model is applied to a drift-free SNR scalable encoder and we show that it performs well for coding of the enhancementlayer bitstream. (c) 2004 Elsevier Inc. All rights reserved.

关键词： rate control SNR scalable coding bit allocation MPEG-2 video coding and transmission

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A unified rate-distortion analysis framework for transform coding

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR video TECHNOLOGY 2001年第12期11卷 1221-1236页

作者： He, ZH Mitra, SK Univ Calif Santa Barbara Dept Elect & Comp Engn Santa Barbara CA 93106 USA

In our previous work, we have developed a rate-distortion (R-D) modeling framework H.263 video coding by introducing the new concepts of characteristic rate curves and rate curve decomposition. In this paper, we further show it is a unified R-D analysis framework for all typical image/video transform coding systems, such as EZW, SPIHT and JPEG image coding;MPEG-2, H.263, and MPEG-4 video coding. Based on this framework, a unified R-D estimation and control algorithm is proposed for all typical transform coding systems. We have also provided a theoretical justification for the unique properties of the characteristic rate curves. A linear rate regulation scheme is designed to further improve the estimation accuracy and robustness, as well as to reduce the computational complexity of the R-D estimation algorithm. Our extensive experimental results show that with the proposed algorithm, we can accurately estimate the R-D functions and robustly control the output bit rate or picture quality of the image/video encoder.

关键词： rate control rate-distortion analysis source modeling transform coding video coding and transmission

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