Patent ID: 8432967
Filing Date: 2013-04-30
Classification: H04N

Abstract:
1. An information processing apparatus configured to encode image data to generate encoded data, comprising: means for rearranging coefficient data divided for each frequency band in order of executing synthesis processing for synthesizing the coefficient data of a plurality of sub-bands divided into frequency bands to generate image data for each line block including image data equivalent to a number of lines necessary for generating coefficient data equivalent to one line of a sub-band of the lowest frequency components; means for calculating a quantization step size at a time of encoding said image data for each coding unit which is a processing increment of encoding; means for correcting the quantization step size calculated by said means for calculating the quantization step size based on a variable indicating evenness of a code amount within a picture of said image data and selecting the variable to minimize a deviation of said code amount, the variable being selected based on a correlation between coefficient data of the picture and coefficient data of a preceding picture of said image data; and means for encoding the coefficient data rearranged by said means for rearranging for each coding unit to generate encoded data using the quantization step size corrected by said means for correcting, wherein the means for calculating and the means for correcting operating in one of a first case in which the correlation between the coefficient data of the picture and the coefficient data of the preceding picture is high and a code amount stored in a buffer is less than a threshold, a second case in which the correlation between the coefficient data of the picture and the coefficient data of the preceding picture is high and the code amount stored in the buffer is greater than the threshold, and a third case in which the correlation between the coefficient data of the picture and the coefficient data of the preceding picture is low.