Patent ID: 7027507
Filing Date: 2006-04-11
Classification: H04N

Abstract:
1. A moving-picture decoder for decoding a predictively coded moving-picture signal, comprising: a predictive decoding unit decoding said predictively coded moving-picture signal with reference to a reference picture signal, thereby obtaining an output picture signal; a data compressor coupled to said predictive decoding unit, compressively coding said output picture signal, thereby obtaining a compressed picture signal; a memory coupled to said data compressor, storing said compressed picture signal; and a data decompressor coupled to said memory, expanding said compressed picture signal, thereby obtaining said reference picture signal, wherein said data compressor comprises: a block partitioning unit dividing said output picture signal into data blocks; a transform processor independently transforming each of said data blocks; and a coding unit coding each of the transformed data blocks, wherein said data decompressor comprises: a decoding unit decoding each of the coded transformed data blocks, thereby obtaining decoded transformed data blocks; an inverse transform processor performing an inverse transform on each of the decoded transformed data blocks to obtain decoded data blocks; and a block assembler reassembling the decoded data blocks, wherein said decoding unit performs a dequantizing process that multiplies all data values in said decoded transformed data blocks by a predetermined power of two, then adds an integer bias value centering said data values according to data probability distributions in each quantizing interval.