Patent ID: 8666179
Filing Date: 2014-03-04
Classification: H04N

Abstract:
1. A picture decoding apparatus comprising: a processor; a data analysis unit executable by the processor to extract, from compressed data, encoded data of a residual signal of a region serving as a process target; a zero/non-zero coefficient information decoding unit executable by the processor to decode the encoded data of the residual signal of the region to restore information representing each quantized transform coefficient of the region as either a zero coefficient or a non-zero coefficient; a non-zero coefficient decoding unit executable by the processor to decode the encoded data of the residual signal of the region to restore a non-zero quantized transform coefficient; a de-quantizing unit executable by the processor to de-quantize the decoded quantized transform coefficient of the region to produce a reproduction frequency transform coefficient; an inverse-transform unit executable by the processor to inverse-transform the reproduction frequency transform coefficient of the region to produce a reproduction residual signal; a prediction unit executable by the processor to produce a prediction signal for a pixel signal included in the region; and a picture restoration unit executable by the processor to add the prediction signal of the region and the reproduction residual signal to restore the pixel signal of the region; wherein the non-zero coefficient decoding unit is further executable by the processor to select, from a probability model composed of a plurality of estimated probabilities, an N-th estimated probability used by the processor to decode an absolute value of a next non-zero quantized transform coefficient of the region, the estimated probability selected from the probability model based on a quantity of already decoded non-zero quantized transform coefficients of the region being N.