Invisible logo watermarking using visualization of spread spectrum signal on high-definition video

This paper introduces an invisible logo watermarking method for high-definition videos. The proposed method imperceptibly embeds a logo watermark into the spatial domain of every frame on the basis of the spread spectrum watermarking method, and visualizes the invisibly embedded logo by exploiting the temporally statistical difference between signals estimated from watermarked and unwatermarked regions within each frame. In the embedding process, this method embeds two patterns, which are a logo pattern and a temporal sync pattern. The logo pattern, which represents copyright information, is permutated by a secret key in the temporal axis. The temporal permutation of the logo watermark pattern guarantees the security that only an authorized user identifies the embedded logo. The temporal sync pattern is to find the starting interval of the permutation for the logo pattern in the logo extracting process. In the logo detecting process, after finding the starting interval, the embedded logo is visualized by accumulating the estimated signal on basis of the secret key and post-processing the accumulated result. Extensive experiments show that the proposed method has good performance in respect of invisibility, security, real-time processing, and robustness against geometrically and temporally mixed attacks.