基于人眼视觉特性的包装印刷图像水印技术研究

Packaging and Printing Images Watermark Technology Based on Human Vision Characteristics

结合图像DCT特征和Dally拟合的HVS模型,提出了一种适合包装印刷图像的水印方案。编程仿真实验结果表明,嵌入水印后的图像与源图像几乎一样,提取的水印与原始水印几乎相同,人眼无法分辨;对含水印的图像进行了压缩和剪切攻击测试,结果表明嵌入的水印具有较好的鲁棒性和透明性;从嵌入方案上看,嵌入的水印具有不可预测性。并对含水印图像进行了抗打印和扫描攻击测试,结果表明提出的水印方案在一定的误差范围内能够检测出包装印刷品的真伪。综合实验结果表明,提出的水印方案是一种较好的、适合于包装印刷品防伪的水印技术方案。

A watermark scheme for the packaging and printing images was put forward according to the image characteristic of discrete cosine transform and human visual model fitted by Dally. Simulation experiments re- suits showed that the watermark image and source image, the extracted watermark and original are almost the same; human eye can not distinguish. Attacking experiments of compression and cutting showed that the embedded watermark has better robustness and transparency; from embedded solutions, the embedded watermark is provided with the unpredictability. The experiments of printing and scanning image embedded watermark showed that proposed watermark scheme can detect the authenticity of presswork in a certain error range. Comprehensive results showed that the proposed watermark scheme is a good watermark technology and suitable for presswork anti-counterfeit.