FIELD: information technology.
SUBSTANCE: invention relates to digital photography, more specifically to analysis of digital image quality. The method of detecting distortions caused by Gibbs effect in JPEG coding involves evaluation of the size of the coding unit with relative the given resolution of the printing device; determination for each coding unit, whether the size of the unit makes it distinctive to the human eye with the required printing resolution, of the approximate metric of distortion distinctiveness, caused by Gibbs effect; setting to zero corresponding elements of the approximate metric of distortion distinctiveness, caused by Gibbs effect if their values are below the preferred threshold; calculation for zero elements of the approximate metric of distortion distinctiveness, caused by Gibbs effect, of the corresponding distortion dispersion; dispersion is zeroed for the rest of the elements.
EFFECT: invention can be used in detecting distortions during JPEG coding.
4 cl, 6 dwg
