Image smoothing device, image smoothing method, and program

摘要

PROBLEM TO BE SOLVED: To provide an image smoothing device, etc. that can smooth only noise while maintaining characteristic color components in an image.SOLUTION: A Lab conversion unit 22 converts an input image from an RGB space to a Lab color space and separates it into a color component a, a color component band a luminance component L. A luminance component weighting determination unit 23 selects a target pixel of pixel conversion among the luminance components Lsupplied from the Lab conversion unit 22, and determines luminance weight W(L) of each peripheral pixel from a difference L in the luminance component Lbetween the selected target pixel and each peripheral pixel of the selected target pixel. Pixel conversion units 24a and 24b determine each bilateral filter to which the luminance weight W(L) determined by the luminance component weighting determination unit 23 is added, for the color components aand b, and use the filters to apply pixel conversion to each peripheral pixel of the target pixel of the color components aand bseparated by the Lab conversion unit 22.