Patent ID: 8300934

Claim:
An image processing device comprising: a dividing unit which divides a brightness histogram of an input image into a plurality of value regions including a dark portion, an intermediate portion, and a bright portion according to gradation; a ratio computing unit which computes the number of pixels of each value region divided by the dividing unit and the number of pixels of the input image, respectively, and computes a ratio of the number of pixels of each value region with respect to the number of pixels of the input image; and a control-point computing unit which computes a first control point between the bright portion and the intermediate portion and a second control point between the intermediate portion and the dark portion, which specify a shape of a correction curve for image correction according to a feature of the input image, the control-point computing unit computing the first control point based on the ratio of the bright portion, and the control-point computing unit computing the second control point based on the ratio of the intermediate portion and the first control point, and further limits the first control point and the second control point to within a predetermined range.