标准混沌映射切换在数字水印中的应用

Digital Watermarking System Based on the Standard Chaotic Maps Switch

提出一种基于标准混沌映射切换的数字水印方法 .首先创建产生混沌随机序列的标准混沌映射模型 ;然后在不同时段根据切换策略产生不同的混沌序列 .嵌入水印时 ,将选择的图像分块 DCT中频系数与混沌序列相加 ,进行取模运算后再嵌入混沌映射模型进行迭代 .检测时利用同一个相应的标准混沌映射模型生成混沌水印序列 ,并进行相关检测 .研究结果证明了这种方法的合理性 .

The standard chaotic maps model is first built to produce many kinds of chaotic sequence based on changing parameters during different time durations. The chaotic signal is added into the block middle-frequency DCT coefficients which is selected by visual model, by the same time taking a modular operation on the sum and embedding the result of the modular operation in the iteration of the standard chaotic generating systems. In the correlative detector, the chaotic sequence is retrieved from the watermarking image by using the corresponding chaotic model. The simulation results show that the performance of this watermarking system is better than that based on single chaotic map.