针对目前数字水印无法抵抗几何攻击的问题,提出了一种基于 QR 码的抗几何攻击数字水印算法。 将文字信息进行了 QR 码编码,所得 QR 码作为水印信息。 将载体图像进行一级离散小波变换,在变换后的低频子图中分块嵌入了水印信息。 实验结果表明,本方法可以抵抗常见的旋转、等比例和不等比列缩放攻击,同时对 JPEG 压缩也具有很好的鲁棒性,此数字水印技术能够广泛应用到数字作品的版权保护中。

A digital watermarking algorithm which can resist geometrical attack was proposed. Literal information was encoded as QR code. The QR code was embedded as a watermark into the low-frequency sub-block graph of the digital image by a discrete wavelet transform. Experiments demonstrated that this method can well resist attacks such as rotation, scaling and JPEG lossy compression. This digital watermarking technology can be widely used in copyright protection of digital works.