An application of multidimensional time-frequency analysis as a base for the unified watermarking approach

Authors:
Srdjan Stanković;Irena Orović;Nikola Žarić
Affiliations:
Electrical Engineering Department, University of Montenegro, Podgorica, Montenegro;Electrical Engineering Department, University of Montenegro, Podgorica, Montenegro;Electrical Engineering Department, University of Montenegro, Podgorica, Montenegro
Venue:
IEEE Transactions on Image Processing
Year:
2010

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Abstract

A watermarking approach based on multidimensional time-frequency analysis is proposed. It represents a unified concept that can be used for different types of data such as audio, speech signals, images or video. Time-frequency analysis is employed for speech signals, while space/spatial-frequency analysis is used for images. Their combination is applied for video signals. Particularly, we focus on the 2-D case: space/spatial-frequency based image watermarking procedure that will be subsequently extended to video signal. A method that selects coefficients for watermarking by estimating the local frequency content is proposed. In order to provide watermark imperceptibility, the nonstationary filtering is used to model the watermark which corresponds to the host signal components. Furthermore, the watermark detection within the multidimensional time-frequency domain is proposed. The efficiency and robustness of the procedure in the presence of various attacks is proven experimentally.