Frequency Band Coding Mode Selection for Key Frames of Wyner-Ziv Video Coding

Abstract

In most Wyner-Ziv video coding approaches, the temporal correlation of key frames is not exploited, since they are simply intra encoded and decoded. In previous work, by using the previously decoded key frames as the side information, we proposed to divide the frequency bands of each block into two classes. Wyner-Ziv coding was used for the low frequency bands of each block, while high frequency bands were intra coded. In this paper, we improve this approach with an efficient coding mode selection technique. Frequency bands are grouped as low and high bands and an appropriate method of coding is selected for them based on the correlation characteristics of each frame with the past. This method does not add complexity to the encoder. Simulation results show that using the proposed method, one can achieve up to 4 dB improvement over prior work.