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Image watermarking using DCT domain constraints

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2 Author(s)
A. G. Bors ; Dept. of Inf., Thessaloniki Univ., Greece ; I. Pitas

Watermarking algorithms are used for image copyright protection. The algorithms proposed select certain blocks in the image based on a Gaussian network classifier. The pixel values of the selected blocks are modified such that their discrete cosine transform (DCT) coefficients fulfil a constraint imposed by the watermark code. Two different constraints are considered. The first approach consists of embedding a linear constraint among selected DCT coefficients and the second one defines circular detection regions in the DCT domain. A rule for generating the DCT parameters of distinct watermarks is provided. The watermarks embedded by the proposed algorithms are resistant to JPEG compression

Published in:

Image Processing, 1996. Proceedings., International Conference on  (Volume:3 )

Date of Conference:

16-19 Sep 1996