Sheet identifying device
AssigneeUniversal Entertainment Corporation
InventorsJun Fujimoto, Nobuyuki Nonaka, Takao Nireki
Life of this patent
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Abstract
A sheet identifying device comprising a light-receiving section (26) for reading each pixel on a sheet which involves color information including a brightness, has a predetermined size, and is handled as one unit, a RAM (114) for storing image data constructed of read pixels, a pixel data increasing/decreasing section (116a) for increasing/decreasing the number of pixels of the image data, and a judging section for judging authentication of the sheet on the basis of the increased/decreased image data.
Claims4
A sheet identifying device which enables judgment of authentication utilizing a microprint formed on a sheet, the microprint being constituted by forming a number of thin lines in a unit width in order to prevent counterfeit, comprising:
- a reader for reading a sheet in pixels, a respective one of which includes color information having brightness, a predetermined size of which is defined as one unit;
- a storage section for storing image data made up of the plurality of pixels read by means of the reader;
- an increasing/decreasing section for acquiring coarsened moiré fringes of the thin lines adjacent on the sheet by increasing or decreasing the number of pixels in the image data;
- and
- a sheet identifying section for identifying authentication of the sheet, based upon moiré data has the acquired moiré fringes among of the image data increased/decreased by means of the increasing/decreasing section.
Dependencies are inferred from the claim text.