A Study on ah Offset Technique to Reduce Quantization Error of Interpolative DPCM

Abstract

Interpolative DPCM, though, shows the better prediction performance than extrapolative DPCM, I has a serial problem that the IDPCM has a mount of coding error based on the quantization error. This articl reports an optimization algorithm to decide the offsets and the optimal parameters (subsampling width an quantization width) of an offset technique that adds offsets to pixels to decrease the quantizatione errors. Whe the offset technique is used with subsampling technique. SNR is increased about 3 [dB] and compression rati becomes about 0.3 [bit/pixel] better.