MOVING IMAGE COMPRESSION ENCODING SIGNAL CONVERSION METHOD AND DEVICE AND MEDIUM RECORDING CONVERSION PROGRAM

摘要

PROBLEM TO BE SOLVED: To calculate an optimum quantization parameter based on a decoding quantization parameter and a quantization parameter calculated in a preceding stage by considering a re-quantization rate distortion function depending on the decoding quantization parameter and a re-quantization parameter. SOLUTION: In a trans-coder 101 provided with an inverse quantizer 53 for performing inverse quantization and a quantizer 55 for performing re- quantization, by providing a quantization parameter switching part 115 for considering a rate distortion function based on an input quantization parameter and switching the quantization parameter, errors in the conversion from quanhization coefficient area data to re-quantization coefficient area data are suppressed as much as possible.