Dual Video Watermarking Technique Based on Energy Difference Ratio and Spread Spectrum
Wenjing Sun · 2009
A dual video watermarking technique based on energy difference ratio and spread spectrum was proposed.Firstly,at the intra prediction,transform and quantization stage,it embeded robust watermarking by low-mid frequency DCT coefficients of direct-permutation.Further more,semi-fragile watermarking was embedded by energy-difference-ratio algorithm.And besides,watermark extraction in this algorithm enabled the blind examination.Experimental results show that the proposed method will not affect the size of video files,and also has strong robustness under attacks such as re-quantization,block-deletion and collusion.