Spatial video watermarking algorithm based on<br /> human visual system and DCT<br />
Journal Title: Science Paper Online - Year 2010, Vol 5, Issue 2
Abstract
We propose a novel video watermark algorithm based on the visual characteristics of block DCT direct current (DC) coefficient which considers the JND model in human visual system (HVS). In order to meet the invisibility and robustness of video watermarking, the proposed method utilizes the stability of DC coefficient. First, we gather all the DC coefficients in luminance blocks to form a sequence, and then divide the sequence into many sub-sequences, on which we use 1D-DCT respectively. Second, the highest frequency coefficient of each sub-sequence is chosen to embed the watermark message by the spread spectrum (SS) method, where the JND model is adopted to dynamically adjust the embedding strength. Experimental results indicate that proposed algorithm makes a good tradeoff between invisibility and robustness compared with the algorithm with fixed embedding strength. In addition, this algorithm has good robustness to video compression attacks at different bit-rate, also resists some common attacks, such as frame deleting, some common signal processing and geometric transformation.
Authors and Affiliations
Shaohui Liu, Jiguang Wang, Feng Shi
Keywords
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