Patent ID: 9401001
Filing Date: 2016-07-26
CPC Classification: G06T

Claim Text:
1. A digital watermarking method comprising: receiving color image data; using one or more programmed processors: i) degrading luminance data representing the color image data with a first contrast sensitivity function (CSF1) to predict visibility changes attributable to an application of digital watermarking to the color image data, in which the CSF1 varies depending on luminance values associated with local regions of the color image data, and in which said degrading luminance data yields first results for image areas within the color image data, and ii) degrading chrominance data representing the color image data with a second contrast sensitivity function (CSF2), in which the CSF2 is separate from the CSF1, to predict visibility changes attributable to an application of digital watermarking to the color image data, and in which said degrading chrominance data yields second results for image areas within the color image data; and using one or more programmed processors, transforming the color image data by digital watermarking plural-bit information therein, in which signal embedding strength of the digital watermarking within different image areas varies based on the first results and the second results.