Patent ID: 7809198
Filing Date: 2010-10-05
Classification: H04N

Abstract:
1. A coding apparatus for coding frame image data, comprising: determination means for determining quantization index data for first frame image data being currently processed, using information regarding a coding process for second frame image data coded already, or determining the quantization index data for the first frame image data using a value obtained by initializing a value of an initial buffer capacity of a virtual buffer; means for calculating a residual value based on luminance values of the first frame image data and the second frame image data; quantization means for executing quantization of the first frame image data on the basis of the quantization index data determined by said determination means; and coding means for coding quantization coefficient data corresponding to the first frame image data quantized by said quantization means, said determination means initializing the value of the initial buffer capacity of said virtual buffer when both of the following conditions are simultaneously true: (1) a difference between the calculated residual value and an average residual value is less than a predetermined threshold, and (2) a scene change occurred between the second frame image data and third frame image data coded immediately preceding the second frame image data, wherein the first frame image data, the second frame image data, and the third frame image data are distinct and separate frames of image data that are processed by the coding apparatus.