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video coding with motion-compensated lifted wavelet transforms

SIGNAL PROCESSING-IMAGE COMMUNICATION 2004年第7期19卷 561-575页

作者： Flierl, M Girod, B Stanford Univ Informat Syst Lab Stanford CA 94305 USA

This article explores the efficiency of motion-compensated three-dimensional transform coding, a compression scheme that employs a motion-compensated transform for a group of pictures. We investigate this coding scheme experimentally and theoretically. The practical coding scheme employs in temporal direction a wavelet decomposition with motion-compensated lifting steps. Further, we compare the experimental results to that of a predictive video codec with single-hypothesis motion compensation and comparable computational complexity. The experiments show that the 5/3 wavelet kernel outperforms both the Haar kernel and, in many cases, the reference scheme utilizing single-hypothesis motion-compensated predictive coding. The theoretical investigation models this motion-compensated subband coding scheme for a group of K pictures with a signal model for K motion-compensated pictures that are decorrelated by a linear transform. We utilize the Karhunen-Loeve transform to obtain theoretical performance bounds at high bit-rates and compare to both optimum intra-frame coding of individual motion-compensated pictures and single-hypo thesis motion-compensated predictive coding. The investigation shows that motion-compensated three-dimensional transform coding can outperform predictive coding with single-hypothesis motion compensation by up to 0.5 bit/sample. (C) 2004 Elsevier B.V. All rights reserved.

关键词： video coding motion compensation adaptive wavelets lifting three-dimensional subband coding of video

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video coding with lifted wavelet transforms and complementary motion-compensated signals

Video coding with lifted wavelet transforms and complementar...

引用

Conference on Visual Communications and Image Processing 2004

作者： Flierl, M Vandergheynst, P Girod, B Swiss Fed Inst Technol Signal Proc Inst CH-1015 Lausanne Switzerland

ISBN: (纸本)0819452114

This paper investigates video coding with wavelet transforms applied in the temporal direction of a video sequence. The wavelets are implemented with the lifting scheme in order to permit motion compensation between successive pictures. We improve motion compensation in the lifting steps and utilize complementary motion-compensated signals. Similar to superimposed predictive coding with complementary signals. this approach improves compression efficiency. We investigate experimentally and theoretically complementary motion-compensated signals for lifted wavelet transforms. Experimental results with the complementary motion-compensated Haar wavelet and frame-adaptive motion compensation show improvements in coding efficiency of up to 3 dB. The theoretical results demonstrate that the lifted Haar wavelet scheme with complementary motion-compensated signals is able to approach the bound for bit-rate savings of 2 bits per sample and motion-accuracy step when compared to optimum intra-frame coding of the input pictures.

关键词： video coding adaptive wavelets lifting three-dimensional subband coding of video complementary motion-compensated signals superimposed prediction

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