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Subband Weighting With Pixel Connectivity for 3-D Wavelet Coding

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3 Author(s)
Cho-Chun Cheng ; Inst. of Inf. Sci., Acad. Sinica, Taipei ; Guan-Ju Peng ; Wen-Liang Hwang

Performing optimal bit-allocation with 3-D wavelet coding methods is difficult because energy is not conserved after applying the motion-compensated temporal filtering (MCTF) process and the spatial wavelet transform. The problem cannot be solved by extending the 2-D wavelet coefficients weighting method directly and then applying the result to 3-D wavelet coefficients, since this approach does not consider the complicated pixel connectivity that results from the lifting-based MCTF process. In this paper, we propose a novel weighting method, which takes account of the pixel connectivity, to solve the problem and derive the effect of the quantization error of a subband on the reconstruction error of a group of pictures. We employ the proposed method on a 2-D+t structure with different temporal filters, namely the 5-3 filter and the 9-7 filter. Experiments on various coding parameters and sequences show that the proposed approach improves the bit-allocation performance over that obtained by using the weightings derived without considering the pixel connectivity in the MCTF process.

Published in:

IEEE Transactions on Image Processing  (Volume:18 ,  Issue: 1 )