基于压缩传感的图像哈希水印算法研究

现有基于图像内容的水印算法在鲁棒性和篡改检测方面存在不足,提出了一种基于压缩传感的图像哈希水印算法。该算法利用压缩传感对图像进行随机投影,得到的压缩测量值作为图像内容特征,通过HMAC(Hash-based Message Authentication Code,基于哈希的消息认证码)算法生成图像摘要,并以水印的方式嵌入到原始图像中;认证时,提取图像中的水印,并对认证图像进行压缩传感随机投影,得到原始图像和认证图像的摘要,通过摘要对比,实现图像认证和篡改检测。仿真实验表明,该方法不仅具有较强的鲁棒性和安全性,还具有较好的篡改检测能力。

The Research of Image Hash Watermarking Algorithm Based on Compressed Sensing

For the reason that the robustness and tamper detection for existing content based watermarking algorithms are poor, an image hash watermarking algorithm is proposed based on compressive sensing. It conducts random projection on image using compressive sensing, and gets compressive measurements which represent the content features of image. By the HMAC algorithm, the image digest is generated and embedded into the original image as watermark. When authentication, the watermark is extracted from the tampered image, and random projection on the tampered image is conducted. By comparing the image digests between original and tampered images, the image authentication and tamper detection are implemented. Experimental results show that the proposed algorithm not only has strong robustness and security, but also has good ability of tamper detection.