Method of halftone watermarking for hiding multi-tone...

Details Method of halftone watermarking for hiding multi-tone... Method of halftone watermarking for hiding multi-tone...

2008-09-15

2011-11-01

Poon, King (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003030, C358S003050, C358S003280, C358S534000, C358S536000, C382S100000

Reexamination Certificate

active

08049930

ABSTRACT:
A method is performed to hide a watermark in two halftone images or in a single halftone image. The halftone image contains information of the hidden watermark, and each pixel value of the halftone image is associated with a corresponding offset value. The offset value is determined according to a corresponding pixel value of the watermark and a corresponding pixel value of another halftone image. The offset value is used to compensate a corresponding input value and a corresponding original error value of the halftone image.

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