Sequenced Illumination
First Claim
1. A system for imaging documents, comprising:
- (a) an image sensor;
(b) at least two different light sources, wherein each light source produces a different mode of illumination;
(c) a lookup table that divides documents into discrete successive sections and specifies a mode of illumination for each section of a document during imaging; and
(d) means for synchronizing said light sources with said image sensor to sequentially illuminate a document passing in front of the image sensor according to said lookup table, producing an interleaved, multi-mode image of said document.
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Accused Products
Abstract
The present invention provides a method and system for imaging documents such as bank notes. The method comprises passing a document past an image sensor such as a line scan camera while sequentially illuminating the document using multi-mode illumination. Two or more light sources are used, each one producing a different mode of illumination. A lookup table divides documents into discrete successive sections (i.e. scan lines) and specifies a mode of illumination (e.g., color, azimuth, reflective, transmissive) for each section of a document during imaging. As the document passes the image sensor, the light sources are activated according to the sequence specified in the lookup table, producing an interleaved, multi-mode image of the document.
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Citations
12 Claims
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1. A system for imaging documents, comprising:
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(a) an image sensor; (b) at least two different light sources, wherein each light source produces a different mode of illumination; (c) a lookup table that divides documents into discrete successive sections and specifies a mode of illumination for each section of a document during imaging; and (d) means for synchronizing said light sources with said image sensor to sequentially illuminate a document passing in front of the image sensor according to said lookup table, producing an interleaved, multi-mode image of said document. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for imaging documents, comprising the steps of:
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(a) accessing a lookup table that divides documents into discrete successive sections and specifies a mode of illumination for each section of a document during imaging; (b) passing a document past an image sensor; and (c) sequentially illuminating said document as it passes said image sensor using multi-mode illumination according to said lookup table to produce an interleaved, multi-mode image of said document. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification