| 摘要 |
PROBLEM TO BE SOLVED: To increase the precision of white balance (hereinafter referred to as "WB") adjustment by discriminating the light source color and hued color of any hued color object. SOLUTION: A white balance adjustment device includes: a WB evaluation value acquisition unit 111 for acquiring the color signal values of pixel positions from an image; a chromaticity histogram creation unit 112 which obtains a chromaticity value from the color signal values, obtains a weighting coefficient decided by a brightness value extracted from the color signal values, and creates the weighting histogram of a two-dimensional chromaticity space according to the chromaticity value and the weighting coefficient; a light source appearance degree calculation unit 113 which obtains a histogram accumulation value and a histogram diffusion value at the center position of the histogram and in the vicinity of the center position for each color temperature of the two-dimensional chromaticity space and which obtains a light source appearance degree for each color temperature according to the histogram accumulation value and the histogram diffusion value; a WB coefficient synthesis unit 114 which calculates a WB coefficient according to the light source appearance degree of each color temperature and the histogram center position; and a WB coefficient multiplication unit 12 which executes a WB calculation on an image by using the calculated WB coefficient. COPYRIGHT: (C)2009,JPO&INPIT
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