ON-PHOTOGRAPHING IMAGE CHANGE AREA EXTRACTION DEVICE, PHOTOGRAPHING IMAGE CHANGE DEVICE AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To correctly identify only an image change area of a designation color of an article even when an article of a similar color is photographed by being overlapped on the article in a photographing image of the article in which a surface has high chroma and a glossy part exists in the surface when illuminated.SOLUTION: A high chroma extraction area determination unit 71 is configured to extract a logical AND area of a white area of an auxiliary mask M4, an area satisfying H0≤(hue pixel value)≤H1 on a hue image, and an area satisfying (chroma pixel value)>Th0 on a chroma image, and a low chroma high luminance extraction area determination unit 72 is configured to extract a logical AND area of the area satisfying H0≤(hue pixel value)≤H1 on the hue image, an area satisfying (chroma pixel value)≤Th0 on the chroma image, and an area satisfying (luminance pixel value)>Th1 on a luminance image, and a logical OR area of both areas is configured to be an image change extraction area.