Rate-distortion Optimized Trellis-Coded Quantization
Wei Jiang, Jun Sun, Jia Wang · 2007
In this paper, a rate-distortion optimized trellis-coded quantization (RDOTCQ) algorithm is presented. Based on rate-distortion criterion, the proposed algorithm improves coding efficiency by adaptively optimizing quantization levels of small signals. In addition, it has no overhead and is fully compatible with the standard decoder. The proposed algorithm can be applied to any TCQ-based systems. In particular, the algorithm has been verified on the platform of the quadtree classified and trellis coded quantized (QTCQ) wavelet image compression system. Experimental results show that the proposed algorithm has a better rate-distortion performance than the QTCQ and some other compression methods.