Wavelet-based digital watermarking for image authentication

TitleWavelet-based digital watermarking for image authentication
Publication TypeConference Paper
Year of Publication2002
AuthorsPaquet, A. H., and R. K. Ward
Conference NameElectrical and Computer Engineering, 2002. IEEE CCECE 2002. Canadian Conference on
Pagination879 - 884 vol.2
Keywordscopy protection, data compression, digital watermarking, discrete wavelet domain, discrete wavelet transforms, human visual system, image authentication, image coding, image compression, image processing operations, image tampering, perceptual transparency, quantisation (signal), quantization, security of data, transform coding, visual perception, wavelet packet coefficients

We present a novel watermarking scheme to ensure the credibility of digital images. The proposed technique is able to detect malicious tampering of images even if they have been incidentally distorted by basic image processing operations. Our system is based on the quantization of wavelet packet coefficients and uses characteristics of the human visual system to maximize the embedding weights while keeping good perceptual transparency. We develop an image-dependant method to evaluate, in the discrete wavelet domain, the optimal quantization steps allowing the tamper proofing of still images. The nature of multiresolution discrete wavelet decomposition allows the spatial and frequency localization of image tampering. Experimental results are presented to demonstrate the capacity of our system to detect unauthorized modification of images while staying robust to image compression.


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