VQ based adaptive multi-watermark algorithm
Qiwei Lin · Computer Engineering and Applications Journal · 2007
In this paper a novel Vector Quantization(VQ) and Discrete Cosine Transform(DCT) based adaptive multi-watermark algorithm was proposed.In proposed work,two different watermarks,which represent the owner of the product,were embedded into the codebook of the image and DCT domains according to Human Visual System(HVS) and image character.By means of adaptively selecting the embedding parameter,the imperceptibility and security on anti attack ability were guaranteed.Experimental results illustrate that the proposed technique provides an improvement over the spread spectrum watermarking technique in terms of robustness for various signal processing attacks,especially in resisting collusion attack.