Title:
SHEET RECOGNIZING DEVICE AND METHOD
Document Type and Number:
WIPO Patent Application WO/2006/054495
Kind Code:
A1
Abstract:
A sheet recognizing device and method for precisely checking the authentication of a sheet by performing recognition of color and watermark of a sheet and detecting the subtle characteristic of a hue ink printed on one side of the sheet. The sheet recognizing device comprises first and third light sources for projecting light at predetermined angles to a sheet, a second light source for projecting light from a vertical direction, first and second light-receiving elements for receiving light at angles at which the hues of the hue ink printed area originated from the lights from the first and second light sources are different, a third light-receiving element opposed to the second light source with the sheet interposed therebetween, first computing means for computing a first color tone depending on the hue ink printed area on the basis of the light-reception outputs from the first light-receiving element due to the light from the first light source and from the second light-receiving element due to the light from the third light source, second computing means for computing a second color tone independent of the hue ink printed area on the basis of the light-reception outputs from the first light-receiving element due to the light from the second light source and from the third light-receiving element due to the light from the third light source, whereby the sheet is checked on the basis of the computation results by the first and second computing means.
Inventors:
ITAKO EIJI (JP)
KIMURA YASUYUKI (JP)
HOUJO FUTOSHI (JP)
TSURUMAKI SATORU (JP)
TAKAMATSU SEIJI (JP)
KIMURA YASUYUKI (JP)
HOUJO FUTOSHI (JP)
TSURUMAKI SATORU (JP)
TAKAMATSU SEIJI (JP)
Application Number:
PCT/JP2005/020735
Publication Date:
May 26, 2006
Filing Date:
November 11, 2005
Export Citation:
Assignee:
NIPPON CONLUX CO LTD (JP)
ITAKO EIJI (JP)
KIMURA YASUYUKI (JP)
HOUJO FUTOSHI (JP)
TSURUMAKI SATORU (JP)
TAKAMATSU SEIJI (JP)
ITAKO EIJI (JP)
KIMURA YASUYUKI (JP)
HOUJO FUTOSHI (JP)
TSURUMAKI SATORU (JP)
TAKAMATSU SEIJI (JP)
International Classes:
G01N21/892; G07D7/12; G07D7/00
Foreign References:
| JPH0294794U | 1990-07-27 | |||
| JPS57143418U | 1982-09-08 | |||
| JPS5429397B2 | 1979-09-22 |
Attorney, Agent or Firm:
Kimura, Takahisa (8-11 Minato 1-chom, Chuo-ku Tokyo 43, JP)
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