Method and device for examining the optical state of value documents

A method for examining the optical condition of a value document on the basis of a digital image of at least a specified region of the value document, the image comprising pixels, comprises searching the pixels of the digital image are searched for sets of error pixels which are respectively given i...

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Bibliographische Detailangaben
1. Verfasser:	Holl Norbert
Format:	Patent
Sprache:	eng
Schlagworte:	CALCULATING CHECKING-DEVICES COMPUTING COUNTING HANDLING OF COINS OR OF PAPER CURRENCY OR SIMILAR VALUABLEPAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING,DISPENSING, CHANGING OR DEPOSITING HANDLING RECORD CARRIERS PHYSICS PRESENTATION OF DATA RECOGNITION OF DATA RECORD CARRIERS
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Beschreibung
Zusammenfassung:	A method for examining the optical condition of a value document on the basis of a digital image of at least a specified region of the value document, the image comprising pixels, comprises searching the pixels of the digital image are searched for sets of error pixels which are respectively given in that the error pixels fulfill a specified deviation criterion for an impermissible deviation of at least one specified pixel property, and the distance of each error pixel of the respective set from at least one other error pixel of the same set does not exceed a specified distance that is greater than the distance of directly neighboring pixels of the digital image, and a number of sets found during the search and/or a value for at least one property of at least one of the sets found during the search is ascertained.