Patent ID: 8085989
Filing Date: 2011-12-27
Classification: G06K,G07D

Abstract:
1. An authenticity determining apparatus comprising: an image-data acquiring unit that acquires image data on an image of a paper sheet based on a reflected light from the paper sheet irradiated with an infrared light; a block-value calculating unit that divides the image data into a plurality of blocks each of which is composed of a plurality of pixels and calculates a block value of each of blocks; an average-block-value calculating unit that calculates an average block value of blocks in a predetermined area of the image data; a correction-block-value calculating unit that calculates a corrected block value of each of the blocks by correcting each of the block values so that the average block value is equal to a predetermined reference value; and an authenticity determining unit that determines authenticity of the paper sheet based on whether each of corrected block values of the blocks composing the predetermined area is within a predetermined allowable numerical range that is preliminarily defined for the predetermined area.