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公开(公告)号：EP2913795A4
公开(公告)日：2016-06-29
申请号：EP13849422
申请日：2013-10-21
发明人： TSUDA YUKA , YAMAGISHI NOBUHIKO , SHIMIZU TOSHIYUKI , HATAKENAKA TAKASHI , SHINOHARA JUNKO , YASUI HIRONOBU , FUKUTA TOMONORI , OTSUKA ISAO , KATO YOSHIAKI
摘要： To determine an image type to perform proper gray scale correction, there are provided a gray scale histogram calculator (1) that calculates a gray scale histogram of gray scale components for each color component; a maximum/minimum calculator (3) that uses these gray scale histograms to calculate, for each color component, a maximum and a minimum of classes having a frequency greater than zero; an image type determiner (2) that generates, from adjacent classes and frequencies in the gray scale histograms, an absolute difference value histogram for each color component, compares the absolute difference values with a predetermined threshold value to determine, according to the presence or absence of an absolute difference value exceeding the threshold value, a size of an area of image regions where the gray scale components are uniform, and determines an image type; a gray scale correction curve generator that generates a gray scale correction curve for correcting a gray scale of an image signal for each color component so that a largest and a smallest of the maximum and minimum of the classes for each color component are set as a maximum and a minimum of the gray scale correction curve; and a gray scale corrector (5) that uses the gray scale correction curve to perform gray scale correction for each color component.
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2.发明公开IMAGE PROCESSING DEVICE, IMAGE PROCESSING METHOD, PROGRAM, AND RECORDING MEDIUM 有权图像处理装置，图像处理方法，程序和记录介质
公开(公告)号：EP2953340A4
公开(公告)日：2016-09-07
申请号：EP13873418
申请日：2013-10-23
发明人： TSUDA YUKA , YAMAGISHI NOBUHIKO , FUKUTA TOMONORI , OTSUKA ISAO
摘要： In an image processing apparatus, maximum values (Ra, Ga, Ba) and minimum values (Ri, Gi, Bi) of the classes of respective color components are calculated; the largest value among the maximum values of the color components is found as an all-color maximum value (Ta), color correction curves (CV) are generated, on the basis of the maximum and minimum values of the respective color components and the all-color maximum value, for color components other than the color component whose maximum value is equal to the all-color maximum value, and the color correction curves are used to perform corrections on the respective color components of the image signal. The color correction curves are generated for performing corrections such that, after the corrections, the maximum value of each color component is approximately equal to the all-color maximum value (Ta). Alternatively, the color correction curves are generated for performing corrections such that, after the corrections, the minimum value of each color component is approximately equal to an all-color minimum value (Ti). Color casts arising from lighting effects at the time of imaging are corrected, and image contrast can be heightened.
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