Robust digital image watermarking based on complex wavelet transform

Authors:
Terzija Nataša;Geisselhardt Walter
Affiliations:
Institute of Information Technology, University Duisburg-Essen, Duisburg, Germany;Institute of Information Technology, University Duisburg-Essen, Duisburg, Germany
Venue:
ICCOM'05 Proceedings of the 9th WSEAS International Conference on Communications
Year:
2005

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Abstract

In this paper a new robust digital image watermarking method is presented. It is based on the Complex Wavelet Transform (CWT) and combines the image feature extraction. The goal is to resist both geometric distortion and signal processing attacks. The proposed method is performed in the spatial domain. By this, the original image is decomposed into four level of CWT decomposition. Every level of CWT decomposition is further separately reconstructed using the Inverse Complex Wavelet Transform (ICWT), in order to form its spatial representation (the channel). For the embedding purpose the channel of the fourth level of decomposition is selected. With the Harris feature detector the salient points of the fourth channel are detected and around the salient points a pseudorandom sequence used as the watermark is repeatedly embedded. Algorithm robustness is tested on the following attacks: JPEG, JPEG2000 compressions, geometrical attacks (rotation, scaling, cropping) and different filtering attacks carried out by using the benchmark software Checkmark.