Abstract: The image watermark is encrypted by the logistic-map sequences in chaotic dynamical systems.And error correcting technology is adopted.The idea of embedded synchronic signal introduced in the algorithm is proposed，which uses the synchronic signal for locating the watermark location.The watermark and synchronic signal are embedded into the DCT low frequency components by quantization.The embedding strength is adaptively controlled by the masking threshold.Experiment results show that the proposed watermarking scheme is inaudible and robust against various signal processing such as lowpass filtering，noise adding，re-sampling and cutting.

摘要： 利用混沌动力力学系统中的Logistic映射对水印图像进行置乱处理，并对其采用纠错编码技术，同时引入嵌入同步信号的思想，利用同步信号定位水印的嵌入位置，根据人耳的听觉特性，采用自适应量化调制策略将水印信息嵌入到DCT域系数中。实验结果表明：该算法不仅具有较好的不可感知性，而且对诸如低通滤波、有损压缩、重采样和剪裁等攻击均具有较好的顽健性。