Embedding frequency modulation infrared watermark in digital...

Details Embedding frequency modulation infrared watermark in digital... Embedding frequency modulation infrared watermark in digital...

2010-07-01

2011-11-22

Rogers, Scott A (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003280, C358S509000, C358S518000, C382S100000, C382S191000, C283S085000, C283S113000, C283S902000, C235S468000

Reexamination Certificate

active

08064102

ABSTRACT:
Embodiments are disclosed for generating an infrared mark indicator comprised of security information in a printed image. Image data is rendered to a CMYK image. A black plane of the CMYK image is separated and transformed to a frequency domain wherein the frequency components are alternated to encode the watermarking message. The CMY values are selected based on the encoded black value in order to maintain a same color appearance image for the printed image under a normal visual light illuminant. The image data is printed on the substrate in accordance with the transformed planes wherein upon the resultant printed image being exposed to infrared illuminant, a print pattern is detectable as an infrared mark when scanned with an infrared sensing device.

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I.J. Cox, J. Kilian, F.T. Leighton and T. Shamoon, “Secure Spread spectrum Watermarking for Multimedia”, IEEE Transaction on Image Processing, 6 (12), pp. 1673-1687 (1997).

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