A Robust Watermarking Algorithm Based on Image Normalization

Digital watermarking algorithms are prune to different attacks. Of these geometric attacks are recognized as one of the strongest attacks for digital watermarking technology. In this paper, we implemented a BNA(Blind Normalization Algorithm) watermarking algorithm resistant to geometrical distortions (rotation, scaling and aspect ratio)and different other attacks(histogram equalization, JPEG, noise) on different contrast images. This algorithm uses a normalized image based on the image moments. A CDMA scheme is used to embed a 256-bit random watermark in the discrete cosine transform domain of the normalized image. CDMA is a multilevel coding in order to achieve a high capacity watermarking scheme.

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