Patent ID: 8014448
Filing Date: 2011-09-06
Classification: H04N

Abstract:
1. An apparatus, including at least one processor, for decoding moving pictures by adaptively using a plurality of quantization weight matrices that are not related by a scalar, the apparatus comprising: a variable length decoding unit to receive an encoded stream of an input image, the encoded stream comprising at least one macroblock and information specifying respective quantization weight matrix corresponding to a respectively determined spatial characteristic of each of the at least one macroblock among the plurality of quantization weight matrices, and to perform variable length decoding on the encoded stream; and an inverse quantization unit to inversely quantize each variable length decoded macroblock by using the respective quantization weight matrix specified by the information, wherein the plurality of the quantization weight matrices comprise a plurality of quantization weight matrices for a luminance component of each macroblock that is determined to be an intra macroblock, and wherein the respective quantization weight matrix used by the inverse quantization unit is individually selected, for each of plural macroblocks of the input image, from one of the plurality of the quantization weight matrices for the intra macroblock, and wherein, when a result of a determination of a spatial characteristic of a determined first intra block of the input image is different from a result of a determination of a spatial characteristic of a determined second intra block of the input image, a different quantization weight matrix is selected from the plurality of quantization weight matrices for the luminance component for the first block than is selected for the second block.