Semi-Fragile Watermarking Technology Based on Image Singular Value
LI Dong-qin · Modern Computer · 2010
In order to ensure watermark security and cancel out the contradiction between robustness to common image processing and fragility to malicious tamper,proposes a new semi-fragile watermarking algorithm based on chaotic map and singular value decomposition(SVD).The algorithm extracts features from the low frequency domain of image wavelet transformation and uses the high sensitivity on initial value of chaotic mapping to generate two watermarks,then embeds them back into the middle frequency domain of the wavelet transformation by using the stability of singular values.Experimental result shows that the algorithm achieves basic goals of semifragile watermarking technology,and shows high robustness against compression,also can detect and indicate the location where a modification takes place.