Abstract
An image watermarking scheme based on Normed Centre of Gravity NCG and lifting-based wavelet resisting nonlinear geometrical attacks was proposed to achieve the copyright protection of digital image in this paper.Firstly the watermark image was preprocessed by employing scrambled.Secondly wavelet transformation based three-level lifting for the original image was conducted and then NCGs were detected from the low frequency and high frequency components then the feature vector was generated by taking distances between NCGs.Finally the copyright information was obtained by calculating the watermark and feature vector.The experimental results show that the scheme can well withstand local nonlinear geometric attacks meanwhile security of the algorithm is guaranteed by using secret keys.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call