基于小波变换和模糊熵的自适应鲁棒水印算法

Adaptive image watermarking based on wavelet transform and fuzzy entropy

提出了一种新的基于模糊理论的小波域自适应鲁棒性水印算法,目前很多小波域算法都没有真正实现自适应,该算法充分考虑了HVS掩蔽特性,利用离散小波变换的性质和模糊熵衡量出来的纹理特征和亮度对噪声的掩盖因子确定该小波系数嵌入水印的强度,使水印在不同图像块有不同的嵌入强度,真正实现自适应,实验结果表明,该算法在保持良好水印透明性的同时,对一些常见的图像处理以及噪声干扰都具有很强的鲁棒性。

This paper proposes a novel digital image robust watermarking scheme based on fuzzy theory in wavelet domain.This algorithm makes use of DWT nature that every wavelet coefficient corresponds to an image block,using fuzzy entropy to measure the richness of image texture and brightness of the noise factor to determine the strength of embedded watermarking.Different watermarking strength embedded in different image blocks determined by fuzzy entropy and brightness factor can adapt in the image and improve the robustness of the watermarking.The experimental results show that the algorithm can maintain good watermarking transparency,at the same time,further enhance the robustness of the watermarking.