Title :
Wavelet-based video coding using adaptive overlapped block motion compensation
Author :
Zhongwei, Ji ; Wenjun, Jiang ; Weile, Zhu
Author_Institution :
Coll. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
fDate :
29 June-1 July 2002
Abstract :
In this paper, we propose a video coding scheme that combines adaptive overlapped block motion compensation (AOBMC) with wavelet-based zerotree coding techniques. AOBMC combines two different motion models: conventional block motion compensation (CBMC) and OBMC. Each model has the respective superiority in some case of motion compensation. This adaptive block-wise motion compensation between both models is used to get a smooth motion field. Smoothness properties of the motion field are employed to reduce temporal redundancies in the image sequence, offering substantial improvements in wavelet-based video coding quality over a variety of bit rates. For exploiting the spatial redundancies in the wavelet subband structure, we introduce a novel technique of zerotree quantization coding based on the human vision system. Our simulation results show that the proposed hybrid wavelet motion compensation video coding scheme provides a performance gain of 0.8-1.2 dB PSNR when compares to the standard H.263 test model TMN-5.
Keywords :
image sequences; motion compensation; motion estimation; quantisation (signal); transform coding; tree data structures; video coding; wavelet transforms; PSNR; TMN-5; adaptive overlapped block motion compensation; human vision system; hybrid scheme; image sequence; motion estimation; simulation results; smooth motion field; smoothness properties; spatial redundancy; temporal redundancy; video coding; wavelet-based zerotree coding techniques; zerotree quantization coding; Bit rate; Humans; Image sequences; Machine vision; Motion compensation; PSNR; Performance gain; Quantization; Testing; Video coding;
Conference_Titel :
Communications, Circuits and Systems and West Sino Expositions, IEEE 2002 International Conference on
Print_ISBN :
0-7803-7547-5
DOI :
10.1109/ICCCAS.2002.1178975