一种基于位置优化的DWT-DCT-SVD水印算法  

A location optimization-based DWT-DCT-SVD watermarking algorithm

作　　者：张奥莹 王树梅[1] Zhang Aoying;Wang Shumei(School of Computer Science&Technology,Jiangsu Normal University,Xuzhou 221116,Jiangsu,China)

机构地区：[1]江苏师范大学计算机科学与技术学院,江苏徐州221116

出　　处：《江苏师范大学学报(自然科学版)》2025年第1期48-55,共8页Journal of Jiangsu Normal University:Natural Science Edition

基　　金：江苏师范大学自然科学基金资助项目(22XFRS040)。

摘　　要：为提高数字水印的鲁棒性和安全性,本文提出一种基于位置优化的DWT-DCT-SVD水印算法.首先,通过Logistic混沌算法对水印进行置乱预处理,以增强算法的安全性;然后,通过网格搜索优化算法精准选择水印最佳嵌入位置,以提高水印的鲁棒性;最后,通过对载体图像和带水印图像进行两级离散小波变换(DWT),并结合离散余弦变换(DCT)和奇异值分解(SVD)技术来完成水印的嵌入和提取,实现信息的高效嵌入与准确恢复.此外,通过动态调整嵌入强度,进一步增强算法的随机性和不可预测性,从而显著提升算法的抗攻击能力.实验结果表明,该方法不仅在保证水印不可见性的前提下能够有效抵抗高斯噪声、旋转、JPEG压缩等多种攻击,而且保障了优越的鲁棒性和安全性,为数字水印技术的实际应用提供了新的解决方案.To enhance the robustness and security of digital watermarks,a location optimization-based DWT-DCT-SVD watermarking algorithm was proposed in this paper.Initially,the watermark went through the preprocessing of scrambling with a Logistic chaos algorithm to enhance the security of the algorithm.Subsequently,the optimal embedding positions were precisely selected using a grid search optimization algorithm to ensure the robustness of the watermark.Ultimately,the watermark was embedded and extracted by subjecting the carrier and watermarked images to a two-stage discrete wavelet transform(DWT),followed by the integration of discrete cosine transform(DCT)and singular value decomposition(SVD)techniques,ensuring the efficient embedding and accurate recovery of information.Additionally,the embedding strength was dynamically adjusted to further enhance the randomness and unpredictability of the algorithm,thereby significantly boosting its resistance to attacks.The experimental results revealed that this method,while ensuring the invisibility of watermarks,could effectively withstand multiple attacks such as Gaussian noise,rotations,and JPEG compression,and at the same time guaranteed superior robustness and security,providing a new solution for the practical application of digital watermarking technology.

关 键 词：Logistic混沌算法 网格搜索 离散小波变换 离散余弦变换 奇异值分解 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]