摘要
随着光电技术与数字处理技术的迅速发展,纸质产品被数字化、被篡改再复制变得更加容易,将数字水印技术应用于版权保护、印刷防伪等领域是一种行之有效且成本低廉的方法.但数字水印技术一直存在着透明性和鲁棒性之间的矛盾,为解决这一问题,提出了一种基于载体图像预处理和DCT-SVD变换的数字水印算法.通过对载体图像进行超像素分割,并对分割后的超像素块分类,完成水印嵌入前载体图像的预处理,之后将水印图像以自适应嵌入强度嵌入到三类不同的载体图像中.实验测试结果表明,通过对载体图像进行预处理,水印算法抵抗噪声攻击、均值滤波攻击、剪切攻击、旋转攻击的能力较强,经过攻击后能够提取出较清晰的水印图像,不同攻击后提取出水印的NC值均大于0.86.嵌入水印后的图像与载体图像视觉效果几乎一致,基本实现了水印鲁棒性与不可见性之间的平衡.
With the rapid development of optoelectronic technology and digital processing technology,it has become easier for paper products to be digitised and tampered with for re-copying.Applying digital watermarking technology to copyright protection,printing anti-counterfeiting and other fields is a proven and inexpensive method.However,there has been a contradiction between transparency and robustness in digital watermarking technology.To solve this problem,a digital watermarking algorithm based on carrier image pre-processing and DCT-SVD transformation is proposed.The pre-processing of the carrier image before watermark embedding is completed by super-pixel segmentation of the carrier image and classification of the segmented super-pixel blocks,after which the watermarked image is embedded into three different types of carrier images with adaptive embedding strength.The results of the experimental tests show that the watermarking algorithm is more resistant to noise attack,mean filtering attack,shearing attack and rotation attack by pre-processing the carrier images,and can extract clear watermarked images after the attacks,and the NC values of the watermarks extracted after the different attacks are greater than 0.86.The visual effects of the embedded watermarked images and the carrier images are almost the same,which basically achieves the balance between robustness and invisibility of the watermark.The watermarked images were almost identical to the carrier images,which basically achieved a balance between robustness and invisibility.
作者
李志健
汪桃
郭凌华
穆萌
LI Zhi-jian;WANG Tao;GUO Ling-hua;MU Meng(College of Bioresources Chemical and Materials Engineering,Key Laboratory of Functional Printing and Transport Packaging of China National Light Industry,Shaanxi University of Science&Technology,Xi′an 710021,China)
出处
《陕西科技大学学报》
北大核心
2022年第5期1-10,17,共11页
Journal of Shaanxi University of Science & Technology
基金
陕西省西安市未央区科技计划项目(201825,201862)。
关键词
色彩空间
超像素分割
载体图像预处理
数字水印
color space
super pixel segmentation
carrier image preprocessing
digital watermarking
