抵抗JPEG的自嵌入内容认证水印方法研究

Resistance to Self-JPEG Watermark Embedded in Content Authentication Method

针对JPEG压缩,提出一种自嵌入的半脆弱内容认证水印方法.采用离散小波分解提取原始图像的稳态特征并映射成水印信息,在密钥控制下生成混沌序列对水印信息进行加密;将水印嵌入到离散余弦变换的量化系数中,最后进行逆量化和逆离散余弦变换变换得到含水印图像.当图像的内容需要认证时,可以区分正常的压缩和恶意篡改,而且还可以进行篡改定位.实验结果表明,该方法对JPEG有损压缩具有较好的鲁棒性、安全性和良好的不可见性.

For JPEG compression, proposed a semi-fragile content from the embedded watermark authentication method. Discrete wavelet decomposition of the steady-state characteristics of the original image extracted and mapped to the watermark, the key is generated chaotic sequence under the control of the watermark is encrypted; the watermark embedded into the DCT coefficient quantization, the last, inverse quantization and inverse discrete cosine Transform transform of the watermarked image. When the hnage content requires authentication, you can distinguish the normal compression and malicious tampering, but also can be tampered with positioning. Experimental results show that the JPEG lossy compression method is robust, security and good invisibility.