FIELD: multimedia technologies.
SUBSTANCE: method includes at least following stages: determining, whether current value of processed coefficient of discontinuous cosine transformation is equal or less than appropriate threshold value, used in current time for quantizing coefficients of discontinuous cosine transformation of image blocks of common intermediate format, and if that is so, then value of discontinuous cosine transformation coefficient is set equal to zero, then currently used threshold value is increased for use as threshold value with next processing of discontinuous cosine transformation coefficient, in opposite case currently used threshold value is restored to given original threshold value, which is used as threshold value for next processing of discontinuous cosine transformation coefficient; determining, whether increased threshold value is greater than given upper limit of threshold value, and if that is so, than increased threshold value is replaced with given upper limit.
EFFECT: higher quality.
8 cl, 4 dwg
