A Spread Spectrum Zero Video Watermarking Scheme based on Dual Transform Domains and Log-Polar Transformation

This paper proposes a zero-video watermark scheme based on 2D-DWT and pseudo 3D-DCT, otherwise Singular Value Decomposition and log-polar transform are applied. The method makes no changes to original images while embedding the owner information of images so as to achieve high transparency. The log-polar transform ensures that the method is robust to rotation operations. In order to achieve the high robustness and security, we use chaotic logistic mapping and spread spectrum (CLMSS) to spread the watermark information. we also use the visual cryptography (VC) scheme to split the secret image into two shares. In the scheme, we use spread spectrum to encode the watermark to a Code Division Multiple Access watermark and use dual transform and log-polar to generate the feature values. Then the visual cryptography scheme is applied to generate the secret image from the feature values and the watermark. In the extraction scheme, we use the secret image which is registered to certification authority and the feature values extracted from the examined image with visual cryptography scheme to generate the CDMA watermark, and then decrypt it to get the watermark information. The experimental are conducted to verify the robustness through a series of experiments.