Method and system for watermark detection
First Claim
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1. A method for detecting a watermark in an image of a document including data, the steps of the method comprising:
- measuring the distribution of the data on the document;
determining a characteristic frequency of the distribution of the data on the document; and
comparing the characteristic frequency of the data on the document with the frequency which is associated with the document to determine if the document is authentic.
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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 tranformation 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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Citations
15 Claims
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1. A method for detecting a watermark in an image of a document including data, the steps of the method comprising:
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measuring the distribution of the data on the document;
determining a characteristic frequency of the distribution of the data on the document; and
comparing the characteristic frequency of the data on the document with the frequency which is associated with the document to determine if the document is authentic. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of determining the authenticity of a document comprising the steps of:
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generating an image of the document;
determining at least one characteristic frequency associated with the image of the document; and
determining if the characteristic frequency for the document as determined matches the characteristic frequency for the document if it were authentic. - View Dependent Claims (8, 9, 10)
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11. A system of detecting a watermark in a document and comparing the detected watermark to determine the authenticity of the watermark, the system comprising:
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an image camera which generates an image of the document;
an image storage which retains the image of the document;
an analysis unit coupled to the image storage which determines a characteristic frequency of the image; and
a comparison unit which compares the characteristic frequency determined by the analysis unit with the correct characteristic for the document; and
a rejection unit which identifies documents for which the frequency determined by the analysis unit is not appropriate for the correct characteristics of the document, whereby the documents which have been identified by the rejection unit may be examined in another way. - View Dependent Claims (12, 13, 14, 15)
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Specification