Patent ID: 8654839
Filing Date: 2014-02-18
Classification: H04N

Abstract:
1. A video signal coding apparatus which codes a video signal including a luminance signal and a chrominance signal, and outputs a coded signal, the video signal coding apparatus comprising: a coding unit configured to perform coding of at least quantization on a picture included in the video signal, and an output of the coded signal; a code amount obtainment unit configured to obtain a luminance code amount and a chrominance code amount which are two code amounts included in the coded signal output from the coding unit, the luminance code amount being a code amount related to the luminance signal, and the chrominance code amount being a code amount related to the chrominance signal; a calculation unit configured to compare the luminance code amount with the chrominance code amount obtained by the code amount obtainment unit based on a ratio of the chrominance code amount to the luminance code amount; and a rate control unit configured to change, based on a result of the comparison by the calculation unit, a coefficient value of at least one of a first quantization matrix for the luminance signal and a second quantization matrix for the chrominance signal which are to be used in the quantization by the coding unit.