FIELD: communication technology. SUBSTANCE: image is transformed into videosignal. Then videosignal is selected for spatial spectrum to high and low frequency components. Amplitude of videosignal of high frequency components is changed according to inverse dependence on its value. Signal of boundaries of differences in brightness is separated. Local radius of curvature of the boundaries is measured. Amplitude of videosignal of high frequency components is inversely changed depending on value of local radius of curvature of the boundaries. After that the signal is added with low frequency components videosignal or with image videosignal. Lower boundary components videosignal of high frequency components is changed in reverse dependence on value of local radius of curvature. EFFECT: improved noise immunity; improved distinguishability of form of low contrast objects. 3 cl, 6 dwg
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