Patent ID: 8351729
Filing Date: 2013-01-08
Classification: G06T

Abstract:
1. An image correcting apparatus for performing correction according to a feature of an input image, the image correcting apparatus comprising: an image shading determining unit that calculates a feature value of average luminance from the pixel value of each pixel in the input image and determines whether the input image is a dark image based on whether the calculated feature value of the input image is equal to or smaller than a second threshold value; a dark-portion-pixel detecting unit that detects, from each pixel of the input image, a pixel having corresponding pixel value equal to or smaller than the first threshold value corresponding to darker luminance than the luminance corresponding to the second value when the input image is determined to be the dark image by the image shading determining unit; a dark-portion shading-variation calculating unit that calculates, for each pixel that is detected by the dark-portion-pixel detecting unit to be a dark pixel having corresponding pixel value equal to or smaller than the first threshold value, a shading variation between the dark pixel and corresponding surrounding pixel; and a correction amount calculating unit that calculates a correction amount based on the shading variation calculated by the dark-portion shading-variation calculating unit and performs image correction with the correction amount.