JP2005175621A5 - - Google Patents

Claims (7)

Encoding means for compression encoding of images, the image coding device that having a decoding means Gosuru restore the compressed and encoded data,
Filter means for varying the spatial filter characteristics by the filter coefficient;
Calculation means for calculating an image to be filtered and output a decoded image output from said decoding means, the distortion seen degree of the decoded image on the basis of the said filter means an input image,
Said encoding means includes quantizing means for varying the quantization characteristics by the quantization scale in accordance with the calculation result of the calculating means, and the spatial filter characteristic of said filter means, and the quantization characteristics in the quantization means the picture coding apparatus you, comprising said filter coefficients for respectively controlling and determining means for determining said quantization scale. Image according to claim 1 wherein the encoding means compresses and encodes the image by block encoding, said calculation means, characterized in that to calculate the strain rate of the boundary pixels of the blocks divided in the block coding Image encoding device. Said determining means, characterized in that depending on the strain seen degree calculated by said calculating means, the pre-Symbol spatial filter characteristics, in accordance with strain rate increases, determines the filter coefficient so as to lower the cutoff frequency picture coding device according to claim 1 or 2,. It said determining means compares the predetermined threshold with the degree observed distortion calculated by said calculation means, when the strain rate exceeds the threshold, for changing the value of the quantization scale picture coding device according to any one of claims 1 to 3, characterized in that to determine the value. A coding process and, images coding method that have a said recovery compression encoded data Gosuru decoding step of compression coding the images,
A filter step for varying the spatial filter characteristics by the filter coefficient;
An image to be filtered and output an input image by the filter process, the decoded image output from said decoding step, a calculating step of calculating the distortion seen degree of the decoded image based on,
The encoding step includes a quantization step for changing a quantization characteristic according to a quantization scale, and according to a calculation result of the calculation step, a spatial filter characteristic of the filter step, a quantization characteristic in the quantization step , the images coded way to anda determination step of said filter coefficients for controlling respectively determining said quantization scale. Program for causing execution by a computer the field picture coding method according to claim 5. Computer-readable storage medium characterized by storing a program of claim 6.