US 8,509,515 B2Granted

Paper sheet identifying device and paper sheet identifying method

AssigneeUniversal Entertainment Corporation

InventorKunihiro Manabe

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Abstract

A bill identification apparatus accurately identifying an authenticity with a folding line formed in a watermark. The bill identification apparatus includes: bill reading means; a converter which converts the watermarked image read by the bill reading means for each pixel containing color information having brightness; a image correction processing part which calculates an average density value for each pixel array in one direction, an average density value for each pixel array in the other direction, and an average density value of an entire watermarked image and corrects density values of respective pixels so as to approximate or match the average density value of the entire watermarked image; a reference data storage part which stores a reference watermarked image; an identification processing part which compares the corrected image by the image correction processing part with the reference watermarked image and identifies an authenticity.

Claims10

Dependent claims

A paper sheet identification apparatus comprising

a reading unit which reads a watermarked image formed on a paper sheet;
a converter which converts the watermarked image read by the reading unit into data for each pixel of a predetermined size as a unit, which contain color information having brightness;
a watermarked image correction processing part which calculates an average density value for each pixel array in one direction, an average density value for each pixel array in another direction, and an average density value of an entire watermarked image based on the watermarked image having been converted for each pixel by the converter, and which corrects density values of respective pixels such that respective average density values for each pixel array in said one direction and for each pixel array in said another direction are approximated or matched to the average density value of the entire watermarked image;
a storage part which stores a reference watermarked image serving as a reference for comparison and containing color information having brightness for each pixel in the predetermined size as the unit;
and
an identification processing part which compares an image corrected by the watermarked image correction processing part with the reference watermarked image stored in the storage part and identifies an authenticity of the paper sheet.

3 more elements

A paper sheet identification method comprising:

a watermarked image acquiring step of acquiring a watermarked image formed on a paper sheet for each pixel of a predetermined size as a unit, which contains color information having brightness,
a watermarked image correction processing step of calculating an average density value for each pixel array in one direction, an average density value for each pixel array in another direction, and an average density value of an entire watermarked image based on the watermarked image acquired for each pixel, and of correcting density values of respective pixels such that corrected average density values of the respective pixel arrays in said one direction and in said another direction are approximated or matched to the average density value of the entire watermarked image, and
an identification processing step of comparing the corrected watermarked image with a watermarked image serving as a reference and identifying an authenticity thereof.

Dependencies are inferred from the claim text.