Image adjustment apparatus, image adjustment method, and program

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United States of America Patent

PATENT NO 12087032
APP PUB NO 20220383614A1
SERIAL NO

17764599

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Abstract

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An image adjustment device includes: an illumination component derivation unit that derives an illumination component of a grayscale image; a reflectance component derivation unit that derives a reflectance component image that is a resulting image in which the illumination component is removed from the grayscale image; a contrast component derivation unit that derives a contrast component based on a contrast value between a pixel of the reflectance component image and a peripheral area of the pixel; a histogram derivation unit that derives a luminance histogram of the grayscale image weighted according to the contrast value for each pixel of the contrast component; a conversion function derivation unit that derives a luminance conversion function for converting a luminance such that a luminance histogram of a converted grayscale image in which the grayscale image is converted by the luminance conversion function and a predetermined histogram are matched with or similar to each other; and a luminance conversion unit that generates the converted grayscale image.

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Patent Owner(s)

Patent OwnerAddress
NIPPON TELEGRAPH AND TELEPHONE CORPORATION5-1 OTEMACHI 1-CHOME CHIYODA-KU TOKYO 1008116 ?1008116

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kashino, Kunio Musashino, JP 50 182
Kawanishi, Takahito Musashino, JP 24 43
Wu, Xiaomeng Musashino, JP 9 16

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