Invisible watermarking in printed images
N. Vinay Kumar, K. Sreelatha, C. Sunil Kumar · 2016
Watermark is pattern of bits inserted into a digital image, that identifies the file's copyright information (author rights etc). The name watermarking is derived from the faintly visible marks imprinted on organizational stationery. A robust and novel strategic approach for insertion-extraction of a digital watermark in color images is presented. Watermarks are generally intended to be visible but are invisible. Invisible insertion of the watermark is performed in the most significant regions of the host image such that tampering of that portion to remove or to destroy will degrade the esthetic quality and value of the image. One feature of the algorithm is that these user defined characters are used as a region of interest for the water marking process and eliminates the changes of watermark removal. Specifically we are interested to develop dithering techniques intended to embed color watermarking into color image. Here we have proposed and implemented dithering techniques in various color spaces like RGB and HSV. An attempt is made to develop full color water marking scheme using those techniques.