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Mathematical Problems in Engineering
Volume 2015 (2015), Article ID 937432, 13 pages
Research Article

A Novel Scrambling Digital Image Watermark Algorithm Based on Double Transform Domains

1School of Mathematics and Physics, Hubei Polytechnic University, Huangshi 435003, China
2School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, China

Received 21 January 2015; Accepted 20 August 2015

Academic Editor: Konstantinos Karamanos

Copyright © 2015 Taiyue Wang and Hongwei Li. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Digital watermark technology is a very good method for protecting copyright. In this paper, in terms of requisition of imperceptibility and robustness of watermarking, the multidirectional, multiscale, and band-pass coefficient features of Curvelet transform are introduced and a novel image watermark scheme based on Curvelet and human visual system is proposed. Digital watermark information is embedded into the first 16 directions with larger energy in the fourth layer. Experimental results indicate that the proposed watermark scheme is feasible and simple. Simultaneously, the embedded watermark images just have tiny difference with the original images and the extracted watermark is accurate. Moreover, it is imperceptible and robust against various methods of signals processing such as cropping, noise adding, and rotating and altering.