Robust digital watermarking algorithm based on PCA and DWT

Key words:  digital watermarking  discrete wavelet transform (DWT)  principal component analysis(PCA)  robustness

Abstract:

The digital watermarking algorithm based on discrete wavelet transform (DWT) is weakly resistant to geometric. This paper presents a digital watermarking algorithm based on principal component analysis and DWT transform. In this algorithm, the host image is first transformed with DWT, and principle component analysis (PCA) is used to de-correlate the image pixel to obtain the principle components. The watermark is then embedded into the principle component. Compared with the watermarking algorithm based on DWT, experimental results indicate that the new algorithm shows a strong robustness:it not only greatly improves the ability against geometric attacks such as anti-cropping, rotation and others, but also has good resistance to noise, change of image gray value and other attacks.