METHOD FOR OBJECTIVELY EVALUATING IMAGE QUALITY OF IRREVERSIBLY COMPRESSED IMAGE

摘要

PROBLEM TO BE SOLVED: To create an image quality evaluation system, in which an arbitrary part such as a ratio of weighting to lock down on a high frequency component is excluded and image quality is evaluated impartially between different image compression systems. SOLUTION: First precision of a color estimated from an error between an original image after smoothing and a compressed image is obtained for every parameter of various smoothing filters. Then a ratio of estimated and stored frequency components is obtained from a ratio of a variance of pixels of the original image to that of the image after smoothing. A maximum value of a product of two indices is used for an evaluation result of the image quality.