| 摘要 |
The invention provides an image processing apparatus, image processing method, and image processing program that perform gradation correction processing with reduced color unevenness, even for an image containing a low-contrast region, with a simple configuration. A first gradation-distribution calculating unit divides the gradation width of an input image signal into a plurality of gradation sections and calculates a first histogram showing the frequency of pixel values in each gradation section; a decision unit decides whether the image contains a low-contrast region on the basis of a feature component signal related to the contrast of the image; a second gradation-distribution calculating unit calculates, using the first histogram, a second histogram which is divided into a greater number of gradation sections than the first histogram; and a gradation correction unit performs gradation correction processing using the second histogram when it is determined that the image contains a low-contrast region, and performs gradation correction processing using the first histogram for other images.
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