Patent ID: 8682068
Filing Date: 2014-03-25
Classification: H04N

Abstract:
1. An image processing apparatus comprising: a representative pixel value calculation unit that divides an image into a plurality of blocks and calculates representative pixel values for each of the plurality of blocks; and a detection unit that detects an object block from among the plurality of blocks, the object block being a block which includes one of a blown-out highlight and a blocked-up shadow, wherein the detection unit performs a first detection processing for obtaining one of a difference between a color represented by the representative pixel values and gray, and a value that can approximately represent the difference, as a characteristic value, and for detecting a block having the characteristic value equal to or smaller than a first threshold, as the object block, wherein the detection unit performs a second detection processing for detecting, as the object block, a block in which a brightness represented by the representative pixel values is equal to or greater than a second threshold and a block in which the brightness is equal to or smaller than a third threshold, the third threshold being smaller than the second threshold, wherein the detection unit first performs the second detection processing on the plurality of blocks and then performs the first detection processing on blocks other than the object block detected by the second detection processing.