关键词: 小波变换, 成对相关变换, 多描述编码

Abstract:

A multiple descriptions transform coding algorithm based on wavelet (WMDTC) is proposed. We first partitioned the wavelet coefficients of the highest and lowest pyramid levels into two sets. A pairwise correlating transform (PCT) was applied to each pair to generate two new sets of coefficients that were correlated between the sets. Coefficients in each set were encoded and decoded independently. Each description was then transmitted through separate channels. If only one channel was working, it was possible to estimate the lost description from another. We combined WMDTC with interpolation to improve reconstructed image. The algorithm performs well in performance simulations.

Key words: wavelet transform, pairwise correlating transform, multiple description coding