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93
Rate-Distortion Optimization for Video Compression
- IEEE Signal Processing Magazine
, 1998
"... this article. Some further techniques which go somewhat beyond this model will also be discussed. [Begin Sidebar Inset Article #1] A History of Existing Visual Coding Standards ..."
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Cited by 277 (13 self)
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this article. Some further techniques which go somewhat beyond this model will also be discussed. [Begin Sidebar Inset Article #1] A History of Existing Visual Coding Standards
Video coding with optimal Inter/Intra-mode switching for packet loss resilience
- IEEE JSAC
, 2000
"... Resilience to packet loss is a critical requirement in predictive video coding for transmission over packet-switched networks, since the prediction loop propagates errors and causes substantial degradation in video quality. This work proposes an algorithm to optimally estimate the overall distortio ..."
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Cited by 188 (15 self)
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Resilience to packet loss is a critical requirement in predictive video coding for transmission over packet-switched networks, since the prediction loop propagates errors and causes substantial degradation in video quality. This work proposes an algorithm to optimally estimate the overall distortion of decoder frame reconstruction due to quantization, error propagation, and error concealment. The method recursively computes the total decoder distortion at pixel level precision to accurately account for spatial and temporal error propagation. The accuracy of the estimate is demonstrated via simulation results. The estimate is integrated into a rate-distortion (RD)-based framework for optimal switching between intra-coding and inter-coding modes per macroblock. The cost in computational complexity is modest. The framework is further extended to optimally exploit feedback/acknowledgment information from the receiver/network. Simulation results both with and without a feedback channel demonstrate that precise distortion estimation enables the coder to achieve substantial and consistent gains in PSNR over known state-of-the-art RD- and non-RDbased mode switching methods.
Adapting Multimedia Internet Content for Universal Access
- IEEE Transactions on Multimedia
, 1999
"... Content delivery over the Internet needs to address both the multimedia nature of the content and the capabilities of the diverse client platforms the content is being delivered to. We present a system that adapts multimedia Web documents to optimally match the capabilities of the client device requ ..."
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Cited by 185 (2 self)
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Content delivery over the Internet needs to address both the multimedia nature of the content and the capabilities of the diverse client platforms the content is being delivered to. We present a system that adapts multimedia Web documents to optimally match the capabilities of the client device requesting it. This system has two key components: (1) A representation scheme called the InfoPyramid that provides a multi-modal, multi-resolution representation hierarchy for multimedia. (2) A customizer that selects the best content representation to meet the client capabilities while delivering the most value. We model the selection process as a resource allocation problem in a generalized rate-distortion framework. In this framework, we address the issue of both multiple media types in a Web document and multiple resource types at the client. We extend this framework to allow prioritization on the content items in a Web document. We illustrate our content adaptation technique with a web ...
Long-Term Memory Motion-Compensated Prediction For Robust Video Transmission
, 2000
"... Long-term memory prediction extends the spatial displacement vector utilized in hybrid video coding by a variable time delay permitting the use of more than one reference frame for motion compensation. This extension provides improved rate-distortion performance. However, motion compensation in comb ..."
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Cited by 113 (28 self)
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Long-term memory prediction extends the spatial displacement vector utilized in hybrid video coding by a variable time delay permitting the use of more than one reference frame for motion compensation. This extension provides improved rate-distortion performance. However, motion compensation in combination with transmission errors leads to temporal error propagation that occurs when the reference frames at encoder and decoder dier. In this paper, we present a framework that incorporates an error estimate into rate-constrained motion estimation and mode decision. Experimental results with a Rayleigh fading channel show that long-term memory motion compensation signicantly outperforms single-frame prediction. 1. INTRODUCTION The eciency of long-term memory motion-compensated prediction (MCP) as an approach to improve coding performance has been demonstrated in [1]. The ITU-T has decided to adopt this feature as Annex U to version 3 of the H.263 standard. In this paper, we show that t...
H.264/AVC in Wireless Environments
- IEEE Transactions on Circuits and Systems for Video Technology
, 2003
"... Video transmission in wireless environments is a challenging task calling for high-compression efficiency as well as a network friendly design. Both have been major goals of the H.264/AVC standardization effort addressing "conversational" (i.e., video telephony) and "nonconversational ..."
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Cited by 109 (5 self)
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Video transmission in wireless environments is a challenging task calling for high-compression efficiency as well as a network friendly design. Both have been major goals of the H.264/AVC standardization effort addressing "conversational" (i.e., video telephony) and "nonconversational" (i.e., storage, broadcast, or streaming) applications. The video compression performance of the H.264/AVC video coding layer typically provides a significant improvement. The network-friendly design goal of H.264/AVC is addressed via the network abstraction layer that has been developed to transport the coded video data over any existing and future networks including wireless systems. The main objective of this paper is to provide an overview over the tools which are likely to be used in wireless environments and discusses the most challenging application, wireless conversational services in greater detail. Appropriate justifications for the application of different tools based on experimental results are presented.
Transporting Real–Time Video over the Internet: Challenges and Approaches
- Proceedings of the IEEE
, 2000
"... Abstract|Delivering real-time video over the Internet is an important component of many Internet multimedia ap-plications. Transmission of real-time video has bandwidth, delay and loss requirements. However, the current Inter-net does not oer any quality of service (QoS) guarantees to video transmis ..."
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Cited by 96 (10 self)
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Abstract|Delivering real-time video over the Internet is an important component of many Internet multimedia ap-plications. Transmission of real-time video has bandwidth, delay and loss requirements. However, the current Inter-net does not oer any quality of service (QoS) guarantees to video transmission over the Internet. In addition, the heterogeneity of the networks and end-systems makes it dif-cult to multicast Internet video in an eÆcient and
ex-ible way. Thus, designing protocols and mechanisms for Internet video transmission poses many challenges. In this paper, we take a holistic approach to these challenges and present solutions from both transport and compression per-spectives. With the holistic approach, we design a frame-work for transporting real-time Internet video, which in-cludes two components, namely, congestion control and er-ror control. Specically, congestion control consists of rate control, rate adaptive encoding, and rate shaping; error con-trol consists of forward error correction (FEC), retransmis-sion, error-resilience and error concealment. For the design of each component in the framework, we classify approaches and summarize representative research work. We point out there exists a design space which can be explored by video application designers, and suggest that the synergy of both transport and compression could provide good solutions.
Bit-rate control using piecewise approximated rate-distortion characteristics
- IEEE Trans. Circuits Syst. Video Technol
, 1998
"... ..."
Video compression -- From concepts to the H.264/AVC standard
- PROCEEDINGS OF THE IEEE
, 2005
"... Over the last one and a half decades, digital video compression technologies have become an integral part of the way we create, communicate, and consume visual information. In this paper, techniques for video compression are reviewed, starting from basic concepts. The rate-distortion performance of ..."
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Cited by 63 (0 self)
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Over the last one and a half decades, digital video compression technologies have become an integral part of the way we create, communicate, and consume visual information. In this paper, techniques for video compression are reviewed, starting from basic concepts. The rate-distortion performance of modern video compression schemes is the result of an interaction between motion representation techniques, intra-picture prediction techniques, waveform coding of differences, and waveform coding of various refreshed regions. The paper starts with an explanation of the basic concepts of video codec design and then explains how these various features have been integrated into international standards, up to and including the most recent such standard, known as H.264/AVC.
Error-Resilient Video Transmission Using Long-Term Memory Motion-Compensated Prediction
, 2000
"... Long-term memory prediction extends the spatial displacement vector utilized in hybrid video coding by a variable time delay permitting the use of more than one reference frame for motion compensation. This extension leads to improved rate-distortion performance. However, motion compensation in comb ..."
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Cited by 53 (16 self)
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Long-term memory prediction extends the spatial displacement vector utilized in hybrid video coding by a variable time delay permitting the use of more than one reference frame for motion compensation. This extension leads to improved rate-distortion performance. However, motion compensation in combination with transmission errors leads to temporal error propagation that occurs when the reference frames at coder and decoder differ. In this paper, we present a framework that incorporates an estimated error into rate-constrained motion estimation and mode decision. Experimental results with a Rayleigh fading channel show that long-term memory prediction significantly outperforms the single-frame prediction H.263-based anchor. When a feedback channel is available, the decoder can inform the encoder about successful or unsuccessful transmission events by sending positive (ACK) or negative (NACK) acknowledgments. This information is utilized for updating the error estimates at the encoder. Similar concepts such as the ACK and NACK mode known from the H.263 standard are unified into a general framework providing superior transmission performance.
MPEG-4 rate control for multiple video objects
- IEEE Trans Circuit Syst Video Technology
, 1999
"... ..."
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