基于Hadamard变换的数字图像水印防伪算法  

Digital image watermarking anti-counterfeiting algorithm based on Hadamard transform

作　　者：陈旭光[1] CHEN Xuguang(Yangling Vocational&Technical College,Wangling Shaanxi 712100 China)

机构地区：[1]杨凌职业技术学院,陕西杨凌712100

出　　处：《自动化与仪器仪表》2021年第9期71-74,共4页Automation & Instrumentation

基　　金：杨凌职业技术学院科学研究基金项目:无互联网环境下机房收发作业防抄袭策略研究(No.A2018048)。

摘　　要：为了提高传统数字图像水印防伪算法的性能,提出了基于Hadamard变换的数字图像水印防伪算法。根据数字图像的特点,采用阈值处理方法去除噪声,通过逆向Hadamard变换完成对数字图像的重构变换,并对原始数字图像进行一级分解,得到多个子带数字图像,再用不重复的方式将数字图像划分为多个子图,提取子块数字图像中的水印信息,通过计算待提取的水印信息的量化值,对各个子块数字图像进行处理,结合数字图像的水印防伪算法流程设计,实现数字图像的水印防伪。实验结果表明,采用数字图像水印的防伪精度高达93.4%,误码率仅为35.9%,具有较好的识别效果。In order to improve the performance of traditional digital image watermarking anti-counterfeiting algorithm,a digital image watermarking anti-counterfeiting algorithm based on Hadamard transform is proposed.According to the characteristics of digital image,threshold processing method is used to remove the noise,and the digital image is reconstructed by reverse Hadamard transform.The original digital image is decomposed into several sub-band digital images,and then the digital image is divided into several sub images in a non repetitive way to extract the watermark information in the sub block digital image,By calculating the quantization value of the watermark information to be extracted,the digital image of each sub block is processed,and the watermark anti-counterfeiting algorithm flow of digital image is designed to realize the watermark anti-counterfeiting of digital image.The experimental results show that the anti-counterfeiting accuracy of the digital image watermark is as high as 93.4%,and the bit error rate is only 35.9%.

关 键 词：HADAMARD变换 数字图像 水印防伪算法 水印提取 

分 类 号：TP39[自动化与计算机技术—计算机应用技术] TS865[自动化与计算机技术—计算机科学与技术]