Effect of Protan Recoloring Algorithm on Inserted Watermark in Presence of the Superimposed AWGN

Abstract

In this paper, the effect of the protan recoloring algorithm on an image with an inserted watermark is analyzed. In addition, the effect of degradation of the quality of the recolored image due to the insertion of watermarks and superimposed AWGN was also analyzed. In the first part of the paper, the effect of color vision deficiency, as a consequence of anomalies in L cones, which is designated as protanomaly (protanopia), is described. People with protanopia do not see a wide range of colors because the colors from the L channel are missing. After that, the recoloring algorithm, which performs recoloring of the image, so that, in protan persons, the visible spectrum of colors is expanded, is described. Then, the algorithm for inserting a watermark, in order to protect copyrights, is described. In the second part of the work, the Experiment, in which the quality of the recoloring image was tested, as well as the quality of the extracted watermark, was described. The results of the experiment are shown with pictures and tables. By applying a comparative analysis of the results of the experiment, using objective (MSE, PSNR, NC and SSIM) and subjective (visual inspection) methods, the insertion factor of the watermark, α, which preserves the quality of the recoloring image as well as the quality of the extracted watermark, was determined. Visual inspection determined the SNR at which visible image degradation and watermarks occur.

Keywords

• Trichromacy
• Protanomaly
• Image recoloring
• Watermark
• SVD algorithm