Method and system for document comparison using cross plane...

Details Method and system for document comparison using cross plane... Method and system for document comparison using cross plane...

2006-07-31

2009-12-08

Lu, Tom Y (Department: 2624)

Image analysis

Applications

Document or print quality inspection

C382S100000, C382S135000, C382S137000

Reexamination Certificate

active

07630520

ABSTRACT:
The invention relates to the field of document authentication and more specifically to an apparatus and method for validating an enhanced feature contained in a document under analysis. More specifically, a cross plane comparison is used within a document comparison system to validate the authenticity of a security document. Two images are extracted from two color-planes (e.g. visible light and infrared) of a specified page of a security document and the presence/absence of a pattern or text in each plane is determined. In operation, the security document is exposed to two light sources and grey scale images are extracted. Binary images are then obtained from the grey scale images by filtering each grey scale image and then thresholding each grey scale image. The difference between the two binary images is then calculated to determine if a pattern or text is present in both planes or only in one plane. A confidence score is determined from the difference and is presented to an operator of the document comparison system.

REFERENCES:
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patent: 2002/0006220 (2002-01-01), Kohchi
patent: 2006/0102843 (2006-05-01), Bazakos et al.
Otsu, Nobuyuki, “A Threshold Selection Method from Gray-Level Histograms,” IEEE Transactions on Systems, Man, and Cybernetics, vol. SMC-9, No. 1, Jan. 1979, pp. 62-66.

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