Image analysis – Color image processing
Patent
1994-09-26
1997-02-11
Muncuso, Joseph
Image analysis
Color image processing
283 88, 382112, 382291, 399 15, G06K 900
Patent
active
056029390
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a specific document discriminating apparatus which makes a determination as to whether read image data is a specific document or not, and an image reading apparatus using it therein.
BACKGROUND OF THE INVENTION
In recent years, in association with progress in the field of image processing technology, now it is possible to make so elaborate copies of bills that copied bills made by a color copying machine can not be distinguished from actual ones. For this reason, now serious efforts are made to develop a specific document discriminating apparatus which can discriminate specific document of bills, securities and the equivalent for preventing the specific document being used for practical purposes.
In a specific document discriminating apparatus, the technology based on the pattern-matching method as described, for instance, in Japanese Patent Laid Open Publication No. 83571/1990 with the title of "Image Recognizing Apparatus" has generally been used. In this apparatus, determination as to whether a document is a specific one or not is made by comparing input image data to pattern data registered previously.
With the conventional type of technology as described above, a particular portion of a specific document is read by checking with visible rays, and read image data is collated and discriminated by means of the pattern matching method, but in this case, however, successful recognition ratio is not 100%, and also general document often includes areas similar to the specific portion of specific document, so it is not always possible to distinguish a specific document from a general document.
If for instance, a precision in discrimination (a threshold value used for discrimination) is raised to prevent a specific document from being overlooked, a percentage of error recognition in which a general document is read as a specific document increases, and on the contrary if a precision in discrimination is lowered to prevent a general document from being read as a specific document, a percentage of recognition in which a specific document is read as a general document goes higher. It is an object of the present invention to make it possible to accurately distinguish a specific document from a general document without fail.
SUMMARY OF THE INVENTION
In order to achieve the object as described above, the present invention provides a specific document discriminating apparatus comprising invisible rays region image detecting means for detecting an invisible rays region image formed with non-color coating varnish emitting rays in an invisible rays area, and discriminating means for making a determination as to whether a document is a specific document or not using the image data detected by the invisible rays region image detecting means. A specific document discriminating apparatus according to the present invention and an image reading apparatus using it therein detects a mark (an invisible rays region image) put on a specific document with non-color coating varnish emitting rays in an invisible rays area (for instance, an infrared rays region), and makes a determination as to whether a document is a specified one or not using the read image data. With this configuration, discrimination between a general document and a specific one can be executed accurately.
Also it is an object of the present invention, in order to achieve the object as described above, to provide an image reading apparatus having a function to make a determination as to whether read image data is a specific document or not comprising infrared rays reading means for reading an infrared rays region image formed with non-color coating varnish emitting rays in an infrared rays region and discriminating means for making a determination as to whether a document is a specific one or not using the image data read by the infrared rays reading means. With this configuration, discrimination between a general document and a specific one can be executed accurately.
It should be noted that the above-descri
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Hashiguchi Tadato
Ukai Takeshi
Muncuso Joseph
Richo Company Ltd.
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