基于Logistic混沌序列和IWT的可逆水印算法研究

Reversible Watermarking Scheme Based on Logistic Chaotic Sequence and IWT

为了能够满足提取水印后准确恢复出原始图像,利用IWT可实现图像的无损重构和Logistics混沌序列随机性、遍历性等特性,设计基于Logistic混沌序列和IWT的可逆水印算法。算法对载体图像进行整数小波变换分解,在低频子带LL中利用Logistics混沌序列水印嵌入位置。实验表明,该算法不可感知性好,水印嵌入容量较大,算法复杂度低,运行速度快,对剪切攻击等也显示出较好的鲁棒性。

This paper proposes a reversible watermark scheme based on the Logistic chaotic sequence and IWT to recover the original image accurately after extracting the watermark,which is using the characteristics of IWT,such as lossless reconstruction of image,randomness and ergodicity.The original host image is transformed by integer wavelet transform,and embeds the watermark in the low frequency sub-band by using the logistic chaotic sequence.Simulation results show that the proposed watermarking scheme has good imperceptibility,large watermark embedding capacity,low algorithm complexity,fast running speed,and good robustness to shear attack.