Method and system for watermark detection

Details Method and system for watermark detection Method and system for watermark detection

2006-11-07

2006-11-07

Wu, Jingge (Department: 2624)

Image analysis

Applications

Reexamination Certificate

active

07133536

ABSTRACT:
A system and method of detecting and authenticating a watermark on a document such as a check which is supposed to include a watermark having known characteristics to verify the authenticity of the document. A digitized image of the document is stored and processed through transformation which generates a frequency distribution. That frequency distribution is processed to determine one or more harmonic compared to a stored value associated with the document to determine that a watermark exists and it is the correct watermark.

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Cox et al, “Secure Spread Spectrum Watermarking for Images, Audio and Video”, in IEEE Int, Conference on Image Processing, vol. 3, pp. 243-246, 1996.

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