System and method for digital watermarking in a calibrated...

Image analysis – Image compression or coding – Including details of decompression

Reexamination Certificate

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Reexamination Certificate

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10644342

ABSTRACT:
What is disclosed is a decoding method for retrieving information bits encoded in a printed image comprising the steps of first receiving an input electronic image as a scanned version of the printed image. A region of interest in the image is then extracted and, for that region, an amount of K colorant present, denoted KH; is obtained. Further, a color value is generated therefrom and the GCR used for encoding that region is determined using KHand the obtained color value. Encoded information bits are retrieved therefrom based on the determined GCR. The estimated KHis preferably evaluated conditional to a capacity signal KLand a luminance signal L. From the obtained data, values of KH, KL, and L, are derived wherein KHis estimated from a high resolution scan, and KLand L are estimated from a down-scaled image, respectively. The capacity signal KLand the luminance signal L are derived from the obtained color value. Further, the capacity signal, KLis derived by first applying a suitable operator S to reduce the image from scanner resolution to the watermark resolution and then converting the obtained color values to CMY estimates such that KL=min(C,M,Y) Alternatively, K-capacity is derived from the amount, KL, y, comprises first converting the obtained color values to CMY estimates and applying a suitable operator S to reduce the image from scanner resolution to the watermark resolution such that KL=min(S(C),S(M),S(Y)); wherein L is described by a linear combination of scan signals RGB, such that L=k1S(R)+k2S(G)+k3S(B). The value of KHis determined by first converting the obtained color values to CMY estimates. The estimates determine K-colorant amount at each pixel such that: K=min(C,M,Y). A suitable operator S is applied to reduce the image from scanner resolution to the watermark resolution.

REFERENCES:
patent: 5699102 (1997-12-01), Ng et al.
patent: 5923774 (1999-07-01), Ostromoukhov
patent: 6643030 (2003-11-01), Loce et al.
patent: 2002/0164052 (2002-11-01), Reed et al.
patent: 1 229 725 (2002-08-01), None
patent: WO 03/005291 (2003-01-01), None

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