An adaptive video watermarking algorithm
Abstract: Robustness is one of the major issues of digital watermarking algorithm. An effective method to improve the robustness of the watermark is to embed the watermark adaptively based on the perceptual property and signal characteristics. In this paper, an adaptive video watermarking algorithm based on wavelet domain is proposed. According to the properties of the 2-D wavelet coefficients, the watermark is inserted into the low frequency subband coefficients to achieve better robustness. In order to improve the strength of the components of the watermark, we propose to classify the coefficients of the low frequency subband based on the motion of the object and the texture complexity of the content in the video sequence. According to the result of classification, the strength of the watermark component is adjusted adaptively. The experimental results show that the watermark just generated is robust to video degradation and distortions, e.g., those that result from additive Gaussian noise, MPEG-2 coding at high compress-ratio, temporal downsampling and spatial downsampling, while the transparency of watermark is guaranteed.