Currently, the problems of digital copyright have become increasingly prominent. However, digital watermark technology is the new technology in the field of copyright protection. And it has certain defects in the practical application. It cannot effectively solve the problem of the geometric attacks in terms of image and the impact on the QR code fast scanning characteristics. In order to solve the problem, this paper presents an improved algorithmin. First, the carrier image uses contourlet transform to extract the low-frequency part of the image. And it is divided into blocks. In addition to the position patterns and separator symbol image, the QR code as watermark information is scrambled transformation. Then each of the QR code information to quantify the watermark is embedded into each block low-frequency image. Experimental result shows that the algorithm not only improves the security of information, but also increases the proportional scaling robustness of arbitrary rotation angle, any equal proportions scaling attacks and other geometric attacks. The proposed algorithm can be widely used in copyright protection, because watermark extraction method belongs to blind watermark in the experiment.
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