【摘要】 假设水印是已知二值序列,原图像小波系数是取值广义高斯分布的独立同分布随机变量,对于乘性水印嵌入方法,基于水印嵌入强度的最大似然估计,该文推导出小波域图像水印的一个最优相关检测器,即水印相关检测必须与检测数据的β次幂作相关运算,其中是广义高斯分布的形状因子。更多还原

【Abstract】 This paper derives a watermark detector for images which are watermarked in DWT domain.Under the assumptions that the watermark coefficients are a known,binary valued sequence.and the original image coefficients are an i.i.d.random sequence from a Generalized Gaussian Distribution(GGD).The paper shows that this watermark should be detected by the watermark with the powerβof the observations(hereβis the shape factor parameter of Generalized Gaussian Distribution).The approach is based on maximum-likelihood estimation of the embedding strength of the watermark.更多还原