Concealing errors in a block-based image signal bit stream

摘要

Bit streams are divided on a block-by-block basis based on information of bit numbers and a parity bit added to each bit stream is checked 500 to generate a switching signal. Either said each bit stream or a proximate bit stream L40 for said each bit stream is selected 600,800 as an optimum bit stream based on the switching signal, wherein the proximate bit stream is generated based on degrees of proximity for reference bit streams L30 spatially adjacent to said each bit stream, and the optimum bit stream is decoded 900 to generate decoded data on a block-by-block basis.