DEVICE, SYSTEM, AND METHOD FOR IMAGE PROCESSING, AND STORAGE MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide an image processor which can easily and efficiently actualize stable gradation conversion. SOLUTION: A first means 215 obtains gradation conversion characteristics for leveling the histogram of an input image. A second means 221 obtains the reverse characteristics of the gradation conversion characteristics for leveling the histogram of the image after the specific gradation conversion. A third means 216 synthesizes the gradation conversion characteristics obtained by the 1st means 215 and the reverse characteristics obtained by the 2nd means 221. A fourth means 222 fits the composite characteristics obtained by the third means 216 with a function of lower order. According to the composite characteristics obtained by the fourth means 222, the gradations of the input image are converted.