Robust Content Based Watermarking Algorithm Using Singular Value Decomposition of Radial Symmetry Maps
Elkhamssa Lakehal, Benmohammed Mohamed · Signal & Image Processing An International Journal · 2014
Nowadays, image content is frequently subject to different malicious manipulations.To protect images from this illegal manipulations computer science community have recourse to watermarking techniques.To protect digital multimedia content we need just to embed an invisible watermark into images which facilitate the detection of different manipulations, duplication, illegitimate distributions of these images.In this work a robust watermarking technique is presented that embedding invisible watermarks into colour images the singular value decomposition bloc by bloc of a robust transform of images that is the Radial symmetry transform.Each bit of the watermark is inserted in a bloc of eight pixels large of the blue channel a high singular value of the corresponding bloc into the radial symmetry map.We justified the insertion in the blue channel by our feeble sensibility to perturbations in this colour channel of images.We present also results obtained with different tests.We had tested the imperceptibility of the mark using this approach and also its robustness face to several attacks.