一种抗任意角度旋转的全息水印算法

目的针对目前数字水印在抗旋转攻击方面鲁棒性较差等问题,提出一种基于DWT变换和仿射变换的抗任意角度旋转的数字全息水印算法。方法首先对数字水印进行全息加密,保证水印的安全性;结合DWT变换,将水印信息嵌入载体图像;然后通过仿射变换实现图像的角度校正,进而实现抗任意角度旋转攻击及其他常见攻击。结果水印在受到各种攻击后,仍能被有效提取,尤其是抗任意角度旋转攻击,NC值均大于0.6。结论提出的算法对任意角度旋转攻击有较强的鲁棒性,可以有效地从含水印的图像中提取水印信息,保证了水印的安全性和有效性。

An Anti-Arbitrary-Angle-Rotation Holographic Watermarking Algorithm

The work aims to propose a digital anti-arbitrary-angle-rotation holographic watermarking algorithm based on DWT transform and affine transformation, with respect to the poor robustness of the current digital watermarking in anti-rotation attack. Firstly, the encrypted hologram of the digital watermarking was done to ensure the watermark security. In combination with DWT transform, the watermark information was embedded in the carrier image. Then, the image angle was rectified based on the affine transformation, thus achieving the anti-arbitrary-angle-rotation attacks and other common attacks. After various attacks, especially the anti-arbitrary-angle-rotation attack, the watermark could still be effectively extracted. The NC value was greater than 0.6. The proposed algorithm is robust against the arbitrary angle rotation attack, and the watermark information can be effectively extracted from the watermarked image, which ensures the security and effectiveness of the watermark.