Semi-fragile Watermarking Algorithm Based on Bi-watermarking Technology
A semi-fragile watermarking algorithm using bi-watermark is proposed in this paper. When embedding watermark, the original image was decomposed by 3-leveI discrete wavelet first, and then edge information of the third approximation coefficient was extracted using canny operator. It was embedded into the third vertical detail coefficient by QR decomposition and replacement getting fragile watermark. Principal component of the third approximation coefficient was got by PCA and embedded into the third horizontal detail coefficient as robust watermark. In the end, the approximation coefficient, changed detail coefficients were constructed to obtain image having watermarking. When authenticating image, the observed image was decomposed by 3-Ievel discrete wavelet first. Image could be authenticated correctly and attacked parts could be localized through comparing the original watermarks and extracted watermarks. Experimental results show the efficiency and feasibility of this method.
robust watermarking fragile watermarking semi-fragile watermarking image authentication QR PCA
Li Yaqin
Department of Computer Engineering Suzhou Vocational University Suzhou,China
国际会议
太原
英文
138-142
2010-10-22（万方平台首次上网日期，不代表论文的发表时间）