Multiplicative Watermark Detection Using Locally Optimum Nonlinearity
Tian-Yu Ye, Yu Fu, Zhiguo Qu, Xinxin Niu, Yixian Yang · 2008
This paper concentrates on watermark detection problem, which judges the existence of watermark. A multiplicative watermark detector using locally optimum nonlinearity is derived, based on the condition that DWT coefficients obey to a generalized Gaussian distribution. Experimental results show that the suggested detector has good performances under various situations. Finally, a method for improving its responses is suggested.