Vis-a-vis the predictive error signal which is obtained dynamic picture image quantization manner, the dynamic picture image quantization device and computer reading possible record media null picture signal to record

摘要

PROBLEM TO BE SOLVED: To provide a technique capable of setting a quantization step width on which subjective image quality including block distortion is reflected as a quantization step width to be used for encoding a moving image.;SOLUTION: Correction base images for the number of blocks, which are defined correspondingly to analysis target blocks composed of a plurality of blocks to be targets for a conversion matrix and configured such that a base image of the conversion matrix is arranged in one block and zero values are padded in the other blocks, are generated to calculate a spatial frequency component. Then, an alteration amount of analysis target blocks is estimated, a visual sensitivity value is calculated based on the spatial frequency of the spatial frequency component and the alteration amount, the spatial frequency component is weighted, and a weight coefficient for a quantization step width set in each base component of the conversion matrix is calculated based on the weighted spatial frequency component, the unweighted spatial frequency component and a conversion coefficient of the analysis target blocks to correct the quantization step width by using the calculated weight coefficient.;COPYRIGHT: (C)2010,JPO&INPIT