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Marek Domanski - One of the best experts on this subject based on the ideXlab platform.
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spatio temporal scalability for mpeg video coding
IEEE Transactions on Circuits and Systems for Video Technology, 2000Co-Authors: Marek Domanski, Adam Luczak, Slawomir MackowiakAbstract:The existing and standardized solutions for spatial scalability are not satisfactory, therefore new approaches are very actively being explored. The goal of this paper is to improve spatial scalability of MPEG-2 for progressive video. In order to avoid problems with too large Bitstreams of the base layer produced by some of the hitherto proposed spatially scalable coders, spatio-temporal scalability is proposed for video compression systems. It is assumed that a coder produces two Bitstreams, where the base-layer Bitstream corresponds to pictures with reduced both spatial and temporal resolution while the enhancement layer Bitstream is used to transmit the information needed to retrieve images with full spatial and temporal resolution. In the base layer, temporal resolution reduction is obtained by B-frame data partitioning, i.e., by placing each second frame (B-frame) in the enhancement layer. Subband (wavelet) analysis is used to provide spatial decomposition of the signal. Full compatibility with the MPEG-2 standard is ensured in the base layer, as compared to single-layer MPEG-2 encoding at bit rates below 6 Mbits/s, the bitrate overhead for scalability is less than 15% in most cases.
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spatio temporal scalability using modified mpeg 2 predictive video coding
European Signal Processing Conference, 2000Co-Authors: Adam Luczak, Slawomir Mackowiak, Marek DomanskiAbstract:The paper describes spatio-temporally scalable MPEG video coders proposed. Such an encoder produces two Bitstreams: base layer Bitstream which represents a video sequence with low spatial and temporal resolution and an enhancement layer Bitstream which provides additional data needed for reproduction of pictures with full resolution and full temporal frequency. The bitrate overhead measured relative to the single layer MPEG-2 Bitstream varies between 2% and 22% for progressive television test sequences. The base layer Bitstream constitutes 34–40% of the overall Bitstream. The base layer encoder is fully compatible with the MPEG-2 video coding standard. The enhancement layer encoder is a modified version of that used by MPEG-2 for spatial scalability.
Slawomir Mackowiak - One of the best experts on this subject based on the ideXlab platform.
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spatio temporal scalability for mpeg video coding
IEEE Transactions on Circuits and Systems for Video Technology, 2000Co-Authors: Marek Domanski, Adam Luczak, Slawomir MackowiakAbstract:The existing and standardized solutions for spatial scalability are not satisfactory, therefore new approaches are very actively being explored. The goal of this paper is to improve spatial scalability of MPEG-2 for progressive video. In order to avoid problems with too large Bitstreams of the base layer produced by some of the hitherto proposed spatially scalable coders, spatio-temporal scalability is proposed for video compression systems. It is assumed that a coder produces two Bitstreams, where the base-layer Bitstream corresponds to pictures with reduced both spatial and temporal resolution while the enhancement layer Bitstream is used to transmit the information needed to retrieve images with full spatial and temporal resolution. In the base layer, temporal resolution reduction is obtained by B-frame data partitioning, i.e., by placing each second frame (B-frame) in the enhancement layer. Subband (wavelet) analysis is used to provide spatial decomposition of the signal. Full compatibility with the MPEG-2 standard is ensured in the base layer, as compared to single-layer MPEG-2 encoding at bit rates below 6 Mbits/s, the bitrate overhead for scalability is less than 15% in most cases.
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spatio temporal scalability using modified mpeg 2 predictive video coding
European Signal Processing Conference, 2000Co-Authors: Adam Luczak, Slawomir Mackowiak, Marek DomanskiAbstract:The paper describes spatio-temporally scalable MPEG video coders proposed. Such an encoder produces two Bitstreams: base layer Bitstream which represents a video sequence with low spatial and temporal resolution and an enhancement layer Bitstream which provides additional data needed for reproduction of pictures with full resolution and full temporal frequency. The bitrate overhead measured relative to the single layer MPEG-2 Bitstream varies between 2% and 22% for progressive television test sequences. The base layer Bitstream constitutes 34–40% of the overall Bitstream. The base layer encoder is fully compatible with the MPEG-2 video coding standard. The enhancement layer encoder is a modified version of that used by MPEG-2 for spatial scalability.
Adam Luczak - One of the best experts on this subject based on the ideXlab platform.
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spatio temporal scalability for mpeg video coding
IEEE Transactions on Circuits and Systems for Video Technology, 2000Co-Authors: Marek Domanski, Adam Luczak, Slawomir MackowiakAbstract:The existing and standardized solutions for spatial scalability are not satisfactory, therefore new approaches are very actively being explored. The goal of this paper is to improve spatial scalability of MPEG-2 for progressive video. In order to avoid problems with too large Bitstreams of the base layer produced by some of the hitherto proposed spatially scalable coders, spatio-temporal scalability is proposed for video compression systems. It is assumed that a coder produces two Bitstreams, where the base-layer Bitstream corresponds to pictures with reduced both spatial and temporal resolution while the enhancement layer Bitstream is used to transmit the information needed to retrieve images with full spatial and temporal resolution. In the base layer, temporal resolution reduction is obtained by B-frame data partitioning, i.e., by placing each second frame (B-frame) in the enhancement layer. Subband (wavelet) analysis is used to provide spatial decomposition of the signal. Full compatibility with the MPEG-2 standard is ensured in the base layer, as compared to single-layer MPEG-2 encoding at bit rates below 6 Mbits/s, the bitrate overhead for scalability is less than 15% in most cases.
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spatio temporal scalability using modified mpeg 2 predictive video coding
European Signal Processing Conference, 2000Co-Authors: Adam Luczak, Slawomir Mackowiak, Marek DomanskiAbstract:The paper describes spatio-temporally scalable MPEG video coders proposed. Such an encoder produces two Bitstreams: base layer Bitstream which represents a video sequence with low spatial and temporal resolution and an enhancement layer Bitstream which provides additional data needed for reproduction of pictures with full resolution and full temporal frequency. The bitrate overhead measured relative to the single layer MPEG-2 Bitstream varies between 2% and 22% for progressive television test sequences. The base layer Bitstream constitutes 34–40% of the overall Bitstream. The base layer encoder is fully compatible with the MPEG-2 video coding standard. The enhancement layer encoder is a modified version of that used by MPEG-2 for spatial scalability.
Bing Zeng - One of the best experts on this subject based on the ideXlab platform.
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error resilient unequal error protection of fine granularity scalable video Bitstreams
EURASIP Journal on Advances in Signal Processing, 2006Co-Authors: Hua Cai, Guobin Shen, Bing Zeng, Zixiang XiongAbstract:This paper deals with the optimal packet loss protection issue for streaming the fine granularity scalable (FGS) video Bitstreams over IP networks. Unlike many other existing protection schemes, we develop an error-resilient unequal error protection (ER-UEP) method that adds redundant information optimally for loss protection and, at the same time, cancels completely the dependency among Bitstream after loss recovery. In our ER-UEP method, the FGS enhancement-layer Bitstream is first packetized into a group of independent and scalable data packets. Parity packets, which are also scalable, are then generated. Unequal protection is finally achieved by properly shaping the data packets and the parity packets. We present an algorithm that can optimally allocate the rate budget between data packets and parity packets, together with several simplified versions that have lower complexity. Compared with conventional UEP schemes that suffer from bit contamination (caused by the bit dependency within a Bitstream), our method guarantees successful decoding of all received bits, thus leading to strong error-resilience (at any fixed channel bandwidth) and high robustness (under varying and/or unclean channel conditions).
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An optimal packetization scheme for fine granularity scalable Bitstream
2002 IEEE International Symposium on Circuits and Systems. Proceedings (Cat. No.02CH37353), 2002Co-Authors: Guobin Shen, Shipeng Li, Zixiang Xiong, Bing ZengAbstract:This paper addresses the problem of optimal packetization for a fine granularity scalable (FGS) Bitstream. A very general performance metric for streaming FGS Bitstreams over packet erasure networks is first defined and analyzed. Then three packetization strategies, namely baseline packetization, binary-tree packetization and optimal packetization are presented, justified and compared. Finally, some experimental results are presented to demonstrate the effectiveness of the packetization schemes.
Amy R Reibman - One of the best experts on this subject based on the ideXlab platform.
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packet loss resilience of mpeg 2 scalable video coding algorithms
IEEE Transactions on Circuits and Systems for Video Technology, 1996Co-Authors: R Aravind, Mehmet Reha Civanlar, Amy R ReibmanAbstract:Transmission of compressed video over packet networks with nonreliable transport benefits when packet loss resilience is incorporated into the coding. One promising approach to packet loss resilience, particularly for transmission over networks offering dual priorities such as ATM networks, is based on layered coding which uses at least two Bitstreams to encode video. The base-layer Bitstream, which can be decoded independently to produce a lower quality picture, is transmitted over a high priority channel. The enhancement-layer Bitstream(s) contain less information, so that packet losses are more easily tolerated. The MPEG-2 standard provides four methods to produce a layered video Bitstream: data partitioning, signal-to-noise ratio scalability, spatial scalability, and temporal scalability. Each was included in the standard in part for motivations other than loss resilience. This paper compares the performance of these techniques (excluding temporal scalability) under various loss rates using realistic length material and discusses their relative merits. Nonlayered MPEG-2 coding gives generally unacceptable video quality for packet loss ratios of 10/sup -3/ for small packet sizes. Better performance can be obtained using layered coding and dual-priority transmission. With data partitioning, cell loss ratios of 10/sup -4/ in the low-priority layer are definitely acceptable, while for SNR scalable encoding, cell loss ratios of 10/sup -3/ are generally invisible. Spatial scalable encoding can provide even better visual quality under packet losses; however, it has a high implementation complexity.
