Abstract
A watermark embed scheme has been developed to insert a watermark with the maximum signal strength for a user selectable visibility constraint. By altering the watermark strength and direction to meet a visibility constraint, the maximum watermark signal for a particular image is inserted. The method consists of iterative embed software and a full color human visibility model plus a watermark signal strength metric. The iterative approach is based on the intersections between hyper-planes, which represent visibility and signal models, and the edges of a hyper-volume, which represent output device visibility and gamut constraints. The signal metric is based on the specific watermark modulation and detection methods and can be adapted to other modulation approaches. The visibility model takes into account the different contrast sensitivity functions of the human eye to L, a and b, and masking due to image content.
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