Color image appearance model applied to printing of watermarked images

Several authors have proposed the application of perceptual models to the watermarking of still images. Most of these methods use a luminance based model and do not take into account the effect of the output process on image quality. For example, in printing, the same digital image appears very different when printed on newsprint, compared to printing on high quality gloss paper. The color image appearance model we described has been used to obtain approximately equal watermark visibility across an image. For a given visibility, this allows a higher watermark signal to be applied to an image. The watermark signal strength has also been corrected for images output on different types of paper stock, to obtain approximately the same visibility level.