FULL-COLOR VISIBILITY MODEL USING CSF WHICH VARIES SPATIALLY WITH LOCAL LUMINANCE

摘要

The present disclosure relate generally to color science and digital watermarking. A full color visibility model has been developed which has good correlation to subjective visibility tests for color patches degraded with a watermark. A relatively better correlation can be achieved with a model that applies a luminance correction to the contrast sensitivity functions (CSF). The model can be applied during the watermark embed process, using a pyramid based method, to obtain equal visibility. Better robustness and visibility can be obtained with equal visibility embed than uniform strength embed. Of course, other features, combinations and claims are disclosed as well.

主权项

1. A digital watermarking method comprising:
receiving color image data; using one or more programmed processors, applying a color visibility model to the color image data to identify image areas correlating to color patches likely to be degraded with an application of digital watermarking; and using one or more programmed processors, applying a pyramid based digital watermarking embedder to obtain equal visibility, in which the digital watermarking embedder is configured, at least in part, based on results obtained from applying the color visibility model.