基于数字水印–二维码标签的黄茶追溯系统研究

Study on the yellow tea traceability system based on the digital watermarking–2D barcode label

改进了一种基于Arnold置乱及离散余弦变换的数字水印嵌入算法:先将水印信息进行Arnold置乱加密、二维码载体图像作离散余弦变换,再根据二维码灰度图像的二值性构造Hash函数,确定嵌入和控制系数以实现嵌入过程。在将企业防伪标识信息嵌入到含茶叶产品种植生产信息的二维码图像中作为追溯产品防伪标签的基础上,设计了基于数字水印–二维码标签的黄茶追溯系统。

This paper improved the digital watermark embedding algorithm based on Arnold scrambling and discrete cosine transform（DCT） transform. Firstly, encrypt the watermarking message via Arnold transform, and then make DCT transform of the original carriers image and embed the watermark message in the transform coefficients of DCT. The embed coefficient and control coefficient are determined by the Hash function according to the watermarking and carriers signal. Finally, the Yellow tea traceability system is designed and constructed on the basis of that a QR code product label technology with authorization digital watermark.