BRIGHTNESS ADJUSTMENT METHOD, IMAGE PROCESSING APPARATUS AND IMAGE PROCESSING PROGRAM

摘要

PROBLEM TO BE SOLVED: To reproduce high-quality images by brightness adjustment even for an image which has a difference in brightness and darkness as large as that of an image obtained by an electronic endoscope.

SOLUTION: A luminance distribution image representing the luminance distribution of the image is produced. The luminance distribution image is produced by generating a luminance image composed of the luminance components of the image and then blurring it for instance (S301-303). Then, an adjustment amount of a brightness level is determined for each pixel based on the value of each pixel of the luminance distribution image (S304). Further, a portion contributing to adjustment of brightness and a portion contributing to adjustment of saturation are determined for each pixel (S305), and a brightness adjustment value and a saturation adjustment value corresponding to the portion are added to the pixel value of the original image (S306).

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