针对不同环境光亮度下手机拍摄印品后提取秘密信息困难的问题, 提出一种基于奇异值信息熵不变特性的抗打印拍摄信息隐藏方法。将彩色载体图像转换到YCbCr颜色空间,选择Contourlet域低频系数进行奇异值分解, 利用奇异值信息熵的不变特性, 将全息加密的彩色QR码嵌入到彩色载体图像的奇异值中。实验结果表明算法不可见性好, 不仅对打印拍摄具有很好的鲁棒性, 而且对压缩滤波攻击及几何攻击后再次打印拍摄二次攻击仍然具有很好的抵抗性。以彩色QR码作为防伪信息, 可以携带丰富的版权信息, 使用手机即可识别, 方便快捷, 在商品包装防伪方面有着很好的实际应用价值。

Aiming at solving the difficulty of extracting secret information from the printed image captured using the mobile phone at different levels of embient luminance, this paper proposes an efficient information hiding algorithm against print-cam based on the invariance of information entropy under SVD. Convert the color carrier image from RGB color space to YCbCr color space ,and then apply SVD(Singular Value Decomposition) to low-frequency sub-bands in contourlet domain. Finally, Embed the holographic encrypted color QR code into the singular value of the color carrier image based on the invariance of image information entropy under SVD. Experimental results show that the algorithm has good invisibility, and not just has good resistance to print-cam attack ,but also resists print-cam attack after compression attacks ,filtering attacks and geometric attacks. The color QR code which can carry abundant copyright information is used as anti-counterfeiting information, and can be recognized by mobile phone quickly. The algorithm has good practical application value in anti-counterfeiting of commodity packaging.