DCT-based watermark recovering without resorting to the uncorrupted original image
ICIP '97 Proceedings of the 1997 International Conference on Image Processing (ICIP '97) 3-Volume Set-Volume 1 - Volume 1
Copyright protection of images using robust digital signatures
ICASSP '96 Proceedings of the Acoustics, Speech, and Signal Processing, 1996. on Conference Proceedings., 1996 IEEE International Conference - Volume 04
A robust DCT-based watermarking for copyright protection
IEEE Transactions on Consumer Electronics
Secure spread spectrum watermarking for multimedia
IEEE Transactions on Image Processing
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In general, visually recognizable watermarks offer to the digital material's owner a stronger impact at the copyright claiming time. However due to a larger amount of the watermark information, watermark transparency and robustness cannot be easily obtained. To accomplish this difficult task, many watermarking algorithms performed in the transform domain have been proposed in the literature. Specially, DWT (Discrete Wavelet Transform) based watermarking algorithms shown their better performance compared with algorithms based on other domain, such as spatial, DCT (Discrete Cosine Transform), DFT (Discrete Fourier Transform) domain algorithm. However in the most DWT-based algorithms, digital material's owner must keep a lot of information, such as original unmarked image, order information of the DWT coefficients, information about watermark pattern, etc., to extract his embedded watermark pattern (logo-type image). In this paper we propose a robust watermarking algorithm based on the DWT, in which the material's owner must keep only original unmarked image and a secrete key. The watermark image size attended in the proposed algorithm is not limited. Experimental results show the proposed algorithm is more robust compared with other watermarking algorithm reported in the literature.