Patent ID: 7460597
Filing Date: 2008-12-02
Classification: H04N

Abstract:
1. An encoding apparatus for encoding source video data, comprising: discrete-cosine-transform means for outputting discrete-cosine-transform coefficients by implementing discrete-cosine-transform processing on the source video data; quantization means for outputting quantized data by using a quantization matrix determined by a quantization index to quantize the discrete-cosine-transform coefficients; a rate controller for determining complexity level of output encoded video data and generating a respective quantization index corresponding to said complexity level; a matrix unit for rewriting said quantization matrix; and encoding means for outputting an encoded stream by encoding the quantized data, together with information representing the rewritten quantization matrix; wherein the quantization matrix used by said quantization means for quantization has quantization coefficients different from those in the rewritten quantization matrix used when inverse quantization in decoding is implemented.