基于纠错编码的彩色图像双水印算法研究

提出一种基于纠错编码的彩色图像双水印算法，用于版权保护和图像篡改定位与恢复。算法在图像的红色分量的频域中嵌入鲁棒水印，在绿色分量的空域中嵌入认证水印。其中，认证水印为从三个颜色分量的DCT系数中提取的二进制编码序列。为提高认证水印的安全性和定位能力．对认证水印进行纠错编码，并利用M序列对认证水印进行加密。仿真实验表明，认证水印能够检测篡改并进行恢复，版权保护水印具有较好的鲁棒性。

Dual Watermarking Algorithm of Color Image based on Error-Correcting Codes

A dual watermarking algorithm of color image based on error-correcting codes for copyright pro- tection, image tamper location and recovery is proposed. The algorithm embeds the robust watermarking into the frequency domain of red component and the authentication watermarking into the spatial region of green component. Wherein, the authentication watermarking is the binary code sequence extracted from DCT coefficients of the three-color component. To improve security and locating capability of the authenti- cation watermark, the authentication watermarking is coded in error-correcting code and encrypted with M -sequence. Simulation results show that the authentication watermarking could detect and recover the tam- pering, and the coovrizht nrotection watermark is of good robustness.