Patent
Printer characterization for UV encryption applications
Raja Bala,Yonghui Zhao +1 more
- pp 79-83
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TLDR
In this paper, the appearance of a color print viewed under UV illumination is predicted using a target comprising color patches each printed using a known coverage of printer colorant(s) using a digital camera or the like.Abstract:
The appearance of a color print viewed under UV illumination is predicted using a target comprising color patches each printed using a known coverage of printer colorant(s). In one case, the target is illuminated using a UV light source and an electronic image of the target is captured using a digital camera or the like. In another case, a spectrophotometer is used both with and without a UV cutoff filter to measure the target. The captured image data or the spectrophotometric measurements are used to derive a UV printer characterization model that relates any arbitrary combination of printer colorants to a predicted UV color appearance value. Metameric colorant mixture pairs for visible light and UV light viewing can be determined using the UV model together with a conventional visible light printer characterization model. A visual matching task is used to determine a correction factor for the UV printer characterization model.read more
Citations
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References
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Substrate fluorescence pattern mask for embedding information in printed documents
Raja Bala,Reiner Eschbach +1 more
TL;DR: In this paper, a watermark embedded in an image that has the property of being relatively indecipherable under normal light, and yet decipherable under UV light is described, where the watermark is embedded in a substrate containing optical brightening agents and a colorant mixture pattern printed as an image upon the substrate.
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