Information processing apparatus and method for encoding image data to generate encoded data

Abstract

An information processing apparatus includes: a rearranging unit for rearranging coefficient data divided for each frequency band in order of executing synthesis processing for synthesizing the coefficient data of multiple sub-bands divided into frequency bands to generate image data for each line block; a calculating unit for calculating a quantization step size when encoding the image data for each coding unit which is the processing increment of encoding; a correcting unit for correcting the value of the quantization step size calculated by the calculating unit using a variable that exhibits the evenness of the code amount within a picture of the image data and takes such a large value that there is little deviation of the code amount; and an encoding unit for encoding the coefficient data rearranged by the rearranging unit for each coding unit to generate encoded data using the quantization step size corrected by the correcting unit.