FIELD: physics; image processing.
SUBSTANCE: invention relates to methods of imitating film granularity in an image. The said result is achieved due to that, film granularity in a video image is imitated by creating a block first i.e. a matrix of transformed coefficients for a set of cutoff frequencies fHL fVL, fHH and fVH, related to the desired granularity structure. Cutoff frequencies fHL fVL, fHH and fVH represent cutoff frequency, in two measurements, of a filter which sets characteristics of the desired film granularity structure. The block of transformed coefficients undergoes inverse transformation, obtaining a sample of film granularity with accuracy of up to a bit, and the said sample is scaled in order to mix with a video signal for imitating film granularity in that signal.
EFFECT: easier imitation of film granularity in an image.
20 cl, 4 dwg
