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Correspondence

by R. L. Lagendijk, E. D. Frimout, J. Biemond, Philips Consumer Electronics
"... The transcoding of MPEG video streams is important in a variety of situations such as in rate reduction for small bandwidth downstream channels and in extracting a fast visual playback stream for digital video cassette recorders. This paper addresses transcoding of MPEG intra-coded frames by selecti ..."
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by selectively copying DCT AC coefficients from the primary MPEG stream into the secondary MPEG stream. A rate-distortion optimal transcoding approach is presented, as well as several computationally more attractive suboptimal approaches. The proposed solutions outperform the more traditional codeword extraction

TRANSCODING

by Error-resilient Transcoding, Minghui Xia, Anthony Vetro, Bede Liu , 2004
"... A key issue in video transcoding for transmission in an error-prone environment is to balance the rate used for the video source with bits allocated for error resilience such that the end-toend distortion is minimized under the given rate constraint and channel condition. The approach presented in t ..."
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A key issue in video transcoding for transmission in an error-prone environment is to balance the rate used for the video source with bits allocated for error resilience such that the end-toend distortion is minimized under the given rate constraint and channel condition. The approach presented

Rate-Distortion Optimized Bit Allocation for Error-Resilient Transcoding

by Error-resilient Transcoding, Minghui Xia, Anthony Vetro, Bede Liu, Huifang Sun , 2004
"... A key issue in video transcoding for transmission in an error-prone environment is to balance the rate used for the video source with bits allocated for error resilience such that the end-toend distortion is minimized under the given rate constraint and channel condition. The approach presented i ..."
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A key issue in video transcoding for transmission in an error-prone environment is to balance the rate used for the video source with bits allocated for error resilience such that the end-toend distortion is minimized under the given rate constraint and channel condition. The approach presented

The information bottleneck method

by Naftali Tishby, Fernando C. Pereira, William Bialek , 1999
"... We define the relevant information in a signal x ∈ X as being the information that this signal provides about another signal y ∈ Y. Examples include the information that face images provide about the names of the people portrayed, or the information that speech sounds provide about the words spoken. ..."
Abstract - Cited by 540 (35 self) - Add to MetaCart
about Y through a ‘bottleneck ’ formed by a limited set of codewords ˜X. This constrained optimization problem can be seen as a generalization of rate distortion theory in which the distortion measure d(x, ˜x) emerges from the joint statistics of X and Y. This approach yields an exact set of self

Rate-distortion optimization for fast hierarchical B-picture transcoding

by Huifeng Shen - in Proc. IEEE Int. Symp. Circuits and Systems , 2006
"... Abstract — an efficient rate-distortion (R-D) optimal method for transcoding hierarchical B-pictures is proposed in this paper. A new R-D model is presented for fast transcoding hierarchical B-pictures in DCT domain, in which the total R-D optimization problem is adjusted to motion R-D optimization ..."
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Abstract — an efficient rate-distortion (R-D) optimal method for transcoding hierarchical B-pictures is proposed in this paper. A new R-D model is presented for fast transcoding hierarchical B-pictures in DCT domain, in which the total R-D optimization problem is adjusted to motion R-D optimization

Rate-Distortion Optimal Skeleton-Based Shape Coding

by Haohong Wang, Aggelos Katsaggelos, Thrasyvoulos Pappas - in Proc. Int. Conf. Image Processing, Thessaloniki, Greece , 2001
"... We present a new shape-coding approach, which decouples the shape information into two independent data sets, the skeleton and the distance of the boundary from the skeleton. The major benefit of this approach is that it allows a more flexible trade-off between accuracy of the approximation and bit- ..."
Abstract - Cited by 3 (3 self) - Add to MetaCart
-allocation cost, and thus, provides the possibility of better performance in the operational rate-distortion (ORD) optimal sense than other reported techniques. The characteristics of these data sets are studied and various approximation approaches are applied on each of them to reach an ORD optimal result. We

SSIM-motivated rate-distortion optimization for video coding

by Shiqi Wang, Abdul Rehman, Student Member, Zhou Wang, Siwei Ma, Student Member, Wen Gao - XUE et al.: GRADIENT MAGNITUDE SIMILARITY DEVIATION 695 , 2012
"... Abstract—We propose a rate-distortion optimization (RDO) scheme based on the structural similarity (SSIM) index, which was found to be a better indicator of perceived image quality than mean-squared error, but has not been fully exploited in the context of image and video coding. At the frame level, ..."
Abstract - Cited by 11 (6 self) - Add to MetaCart
Abstract—We propose a rate-distortion optimization (RDO) scheme based on the structural similarity (SSIM) index, which was found to be a better indicator of perceived image quality than mean-squared error, but has not been fully exploited in the context of image and video coding. At the frame level

Rate-distortion optimized interactive light field streaming

by Prashant Ramanathan, Mark Kalman, Bernd Girod - IEEE Transactions on Multimedia , 2007
"... Abstract—High-quality, photorealistic image-based rendering datasets are typically too large to download entirely before viewing, even when compressed. It is more suitable to instead stream the required image data to a remote user who can start interacting with the dataset immediately. This paper pr ..."
Abstract - Cited by 9 (1 self) - Add to MetaCart
presents an interactive light field streaming system and proposes packet scheduling for transmitting the encoded image data in a rate-distortion optimized manner. An interactive light field streaming system must have low user latency. The system presented in this paper predicts the future user viewing

Low Complexity Rate-Distortion Optimized Time-Segmentation

by Christoffer A. Rødbro, Mads G. Christensen, Fredrik Nordén, Søren Holdt Jensen - in Proc. IEEE Workshop on Applications of Signal Processing to Audio and Acoustics (WASPAA 2005), New Paltz , 2005
"... In this paper, we investigate a reduced complexity approach to rate-distortion optimized time-segmentation in audio coding. In-stead of the conventional closed-loop approach for determining the coding distortions, they are estimated from a set of features extracted from the audio signal. Care is tak ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
In this paper, we investigate a reduced complexity approach to rate-distortion optimized time-segmentation in audio coding. In-stead of the conventional closed-loop approach for determining the coding distortions, they are estimated from a set of features extracted from the audio signal. Care

T.: Rate-distortion optimization in dynamic mesh compression

by A. Smolic, M. Kautzner, T Wieg - Signal Processing: Image Communication
"... Recent developments in the compression of dynamic meshes or mesh sequences have shown that the statistical dependen-cies within a mesh sequence can be exploited well by predic-tive coding approaches. Coders introduced so far use ex-perimentally determined or heuristic thresholds for tuning the algor ..."
Abstract - Cited by 7 (0 self) - Add to MetaCart
the algorithms. In video coding rate-distortion (RD) optimi-zation is often used to avoid fixing of thresholds and to se-lect a coding mode. We applied these ideas and present here an RD-optimized mesh coder. It includes different predic-tion modes as well as an RD cost computation that controls the mode
Results 1 - 10 of 602