面向防伪认证的PDF417二维码水印技术的实现

Realization of PDF417 Two-Dimensional Code Watermarking Technology for Security Certification

利用PDF417二维条码以模组为原子的特点,提出一种基于模组的PDF417条码水印的方法。该方法首先将水印转换成二进制数据,再选取PDF417二维条码中符合特定条件的区域作为水印信息的嵌入点,根据待嵌入的水印信息值修改二维码图像的像素值,实现水印信息的嵌入和提取。实验结果表明,相比同类算法,根据本文提出的方法嵌入水印后的图像具有更高的质量和更大的水印容量。同时,该方法具有较好的抗JPEG压缩和抗打印扫描的鲁棒性,但是对设备分辨率要求较高。

Utilizing the characteristic that the PDF417 two-dimensional code takes the module as an atom,the paper proposes a digital watermark method based on the module of PDF417 two-dimensional code.The method first converts the watermark into binary data, and then selects the eligible area in the PDF417 two-dimensional code as the embedding point of the watermark.The pixel value of the two-dimensional image is modified according to the watermark information value to be embedded to realize the embedding and extraction of the watermark.The experimental results show that,compared with similar algorithms,the proposed method in this paper has higher image quality and larger watermark capacity.Additionally, the method has good robustness against JPEG compression,printing and scanning,but with higher resolution requirements for the device.