An Entropy based Video Watermarking Scheme

The emerging interest in the field of digital watermarking is due to the increase in concern over copyright protection of digital information and prevention of unauthorized access, duplication and manipulation of digital data. In this paper, an entropy based blind video watermarking scheme is proposed using combined DCT-DWT transform. Two level DWT is performed on the extracted video frames, which results in sixteen subbands. Entropy is calculated for all the sixteen subbands and the subband with the highest entropy is chosen for embedding the watermark bits. 8x8 block based DCT is performed on this subband and the middle frequency transformed coefficients of each block are selected for embedding the watermark bits. The watermarked video frames are QPSK modulated and transmitted through an AWGN channel. At the receiver end the watermarked frames are QPSK demodulated and the watermark is extracted. This scheme applied to videos shows that it is highly imperceptible and exhibits high robustness against additive white Gaussian noise. General Terms Security.