Abstract
Objective To propose a holographic watermarking algorithm resistant to geometric attack based on image correction. Methods In the phase of watermark embedding, a binary watermark was converted to a hologram using the computer generated holography by the conjugate-symmetric extension, and the hologram was embedded in the high-frequency coefficients of the original image decomposed by DWT transformation. The template was then inserted into the DFT domain of the watermarked image. During extraction of the watermark, the image was first corrected using the template information and then the information was extracted. Results The proposed algorithm combined the use of holography and the image correction method of template matching. It could effectively resist low-pass filtering, noise, cropping, JPEG compression, rotation, scaling attacks and hybrid attack of rotation and scaling. Conclusion The algorithm proposed in this paper could efficiently resist geometric attacks in practice and could be used in copyright protection.
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BAI Tao-tao, LIU Zhen, LU Peng.
Holographic Watermarking Algorithm Resistant to Geometric Attack Based on Image Correction[J]. Packaging Engineering. 2014(19): 103-108
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