QUANTIZATION DEVICE, INVERSE QUANTIZATION DEVICE, PICTURE PROCESSING UNIT AND QUANTIZATION METHOD, REVERSED QUANTIZATION METHOD AND PICTURE PROCESSING METHOD

摘要

PURPOSE:To suppress deterioration in data quality in the case of decoding and to attain constant rate compression by sending plural different scale factors multiplied with quantization matrix information in one processing block based on processing location information of an orthogonal transformation coefficient. CONSTITUTION:A quantization device 10 is provided with a scale factor transmitter receiving sets of basic location information Pi, Pj representing to which location in a matrix whose elements are 8X8 orthogonal transformation coefficients correspond, a quantization table memory 303, a scale factor transmitter 20, a multiplier and clipping processing unit 301 connecting to an output of the quantization table memory 303 and a quantization computing element 202. Through the constitution above, a scale factor is changed corresponding to the location in one processing block, a scale factor is changed depending on the importance of picture data implementing quantization processing and the similar picture quality to that of a high compression quantization table is obtained by using a low compression quantization table.