改进的基于 QR 码的数字全息水印

目的提出改进的基于快速响应矩阵码(QR码)的数字全息水印。方法利用加密傅里叶全息技术对QR码进行加密并生成全息图,在标准颜色空间下,抽取彩色载体图像的L分量进行二级小波分解,将全息图嵌入到其分解后的低频系数中,以实现水印信息的隐藏。为提高QR码译码成功率,对提取后的水印进行十字型中值滤波处理。结论 QR码水印能够保存完整的水印信息,比普通图像水印鲁棒性强,且相比于其他基于QR码的数字全息水印算法具有更强的鲁棒性。

Improved QR Code-based Digital Holographic Watermark

Objective To propose an improved QR code-based digital holographic watermark. Methods This method used encrypted Fourier holography for QR-code encryption and hologram generation. In order to hide the watermark information, the hologram image was embedded into low frequency coefficients of the host image after 2-level wavelet decomposition of the L components in the standard color space. To improve the success rate of QR code decoding, the extracted watermark was processed by cross median filter. Conclusion Comparative experiments showed that QR code watermark had the ability to retain complete watermark information and had better robustness than ordinary watermark image. Compared to other similar algorithms, the proposed method had better robustness.