Patent ID: 8456578
Filing Date: 2013-06-04
Classification: H04N

Abstract:
1. An image processing apparatus that corrects gradation of a video image using a gradation conversion curve, comprising: an acquisition unit that divides an inputted video image into a plurality of divisions, and acquires a histogram of each of the divisions; a generation unit that generates a gradation conversion curve for each of the divisions, on the basis of the histogram of each of the divisions; a determination unit that determines whether or not the inputted video image is a multi-screen video image in which a plurality of video image contents are displayed on one screen; and a gradation correction unit that corrects the gradation of the video image in each of the divisions using the gradation conversion curve of each of the divisions, wherein in a case where the inputted video image is the multi-screen video image, the determination unit detects a position of a boundary between the plurality of video image contents, and the gradation correction unit performs the correction using only the gradation conversion curve of the division containing a pixel to be corrected in a case where the pixel to be corrected is within a predefined area from the boundary, and performs the correction using the gradation conversion curve of the division containing the pixel to be corrected and the gradation conversion curve of an adjacent division to the division containing the pixel to be corrected in a case where the pixel to be corrected is not within the predefined area from the boundary.