Patent ID: 7852379
Filing Date: 2010-12-14
Classification: H04N

Abstract:
1. An image forming apparatus that causes an imaging unit to acquire a first image of a photogenic subject by illuminating the photogenic subject with external light and with light of an illuminating unit and acquires a second image by illuminating the photogenic subject with only the external light, and subtracts luminance values of the second image from those of the first image thereby obtaining a luminance difference image that include only luminance values corresponding to the light of the illuminating unit, the image forming apparatus comprising: an imaging controller that controls the illuminating unit and the imaging unit to split a predetermined exposure time into a plurality of split exposure times and to acquire, for each split exposure time or by selecting a part of the desired split exposure time, the first image and the second image; a calculating unit that subtracts the luminance values of the second images from those of the first images that are acquired by the imaging controller thereby obtaining a luminance difference image for each split exposure time; and an integrating unit that integrates the luminance difference images thereby forming an integrated image in which only the luminance values of the illumination are integrated.