On Mardia's and Song's measures of kurtosis in elliptical distributions
Journal of Multivariate Analysis
Color Image Watermarking Using Multidimensional Fourier Transforms
IEEE Transactions on Information Forensics and Security
IEEE Transactions on Image Processing
Multichannel watermarking of color images
IEEE Transactions on Circuits and Systems for Video Technology
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In this paper we present a novel watermark detector for additive spread-spectrum watermarking in the wavelet transform domain of color images. We propose to model the highly correlated DWT sub-bands of the RGB color channels by multivariate power-exponential distributions. This statistical model is then exploited to derive a likelihood ratio test for watermark detection. Our results indicate that joint statistical modeling of color DWT detail subbands leads to increased detection performance compared to previous approaches, namely watermarking of the luminance channel only, decorrelating the color bands, or relying on a joint Gaussian host signal model.