Paper identifying apparatus and paper identifying method

Abstract

A bill identification apparatus which accurately identifies an authenticity of a watermarked area formed on a bill is provided. The bill identification apparatus has light receiving parts (81c, 82c) which respectively receive reflected lights from a front surface and a rear surface of a watermarked image formed on the bill conveyed, a converter (232) which converts a watermark image from the reflected lights respectively received by the light receiving parts (81c, 82c) to data including color information having brightness for each pixel as a unit of a predetermined size, and an identification processing part (235) which identifies the authenticity of the watermark image based on the density value for each pixel of the light receiving parts (81c, 82c) converted by the converter (232) and a density value for each pixel of a watermarked image by a transmitted light of the bill as the reference.

Dependencies are inferred from the claim text.