Digital watermarking for image copyright protection in the wavelet domain, robust against geometric attacks [articol]

Abstract

This paper proposes a digital watermark embedding method based on a multiresolution wavelet decomposition. The robustness against geometric distortions is based on image normalization. The watermark embedding and extraction are carried out with respect to an image normalized to meet a set of predefined moment criteria. We embed the watermark into the higher level detail wavelet coefficients from different wavelet subbands with the use of a key. The resulting watermarking scheme can be used for public watermarking applications, where the original image is not available for watermark extraction.