针对水印系统抗攻击能力弱的问题,对目前所提出的数字图像水印技术进行深入分析,采用哈尔小波变换对原始图像进行水印图像的嵌入,通过DCT变换对添加过水印图像的数字图像进行还原,提取出水印图像,同时采用添加白噪声、高斯低通滤波处理、对图像进行部分剪切、将图像旋转10度、将图像压缩处理、添加椒盐噪声以及不处理图像直接显示提取水印方式对水印图像进行攻击,原始水印图像和提取出的水印图像之间的互相关系数平均达90%以上。

Aiming at the problem of low anti attack ability of watermarking system,the research background of digital image watermarking technology is introduced,and selects the original image and watermark image of the digital image,and uses Haar wavelet transform to embed the original image watermarking image.DCT transform is used to restore the digital image that has been added to the watermark image and extract the watermark image.At the same time,the watermark image is attacked by adding white noise,low-pass Gaussian filtering,partial cutting of the image,rotating the image by ten degrees,compressing the image, adding salt and pepper noise and not processing the image.The simulation results are analyzed.The correlation coefficient between the original watermark image and the extracted watermark image is above 90% on average.