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ICIP09-color-wm Source Code

This is "The Multimedia Signal Processing and Security Lab", short WaveLab, website. We are a research group at the Artificial Intelligence and Human Interfaces (AIHI) Department of the University of Salzburg led by Andreas Uhl. Our research is focused on Visual Data Processing and associated security questions. Most of our work is currently concentrated on Biometrics, Media Forensics and Media Security, Medical Image and Video Analysis, and application oriented fundamental research in digital humanities, individualised aquaculture and sustainable wood industry.
MATLAB code implementing and testing the multivariate power-exponential (MPE) detector for additive watermarking in the DWT domain coefficient of color images proposed in the paper

Roland Kwitt, Peter Meerwald, Andreas Uhl, "Color-Image Watermarking using Multivariate Power-Exponential Distribution", In Proceedings of the IEEE International Conference on Image Processing, ICIP '09, pp. 4245-4248, Cairo, Egypt, November 7 - 11, 2009.

Abstract: 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 subbands 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.

See README for details.

The code is available upon request.

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