一种基于小波变换的鲁棒彩色图像水印算法(英文)

A Robust Wavelet-Based Color Image Digital Watermarking Algorithm

随着网络化多媒体技术的迅速发展,安全的数据通信与传输需求日益增加,如卫星遥感、医疗图像、远程监控等领域都迫切需要安全的通信与传输.而数据完整性不能完全解决数据传输过程中的安全性问题,数字水印技术是一种解决该问题的方案,基于小波变换,提出了一种鲁棒的彩色数字水印算法.算法以一随机实值序列为水印,首先对彩色图像G分量进行三层小波变换,然后将水印嵌入到G分量的低频子带中.通过阈值选择比较水印嵌入前后G分量低频子带系数以提取水印.实验结果表明提出算法能抵抗多种不同类型攻击,如椒盐噪声、剪切、尺度、JPEG压缩、中值滤波、复制/粘贴等.

With the growth of networked multimedia systems, the need of secure communication and data transfer goes increasingly. Applications such as satellite or medical imagery, or remote monitoring are numerous and various. During images transfer, data integrity is not really secure. Watermarking can be an answer to such problems. In this paper, a new robust wavelet-based color image digital watermark algorithm is proposed. The proposed digital watermark is a random real number of a sequence of bits embedded into low frequency of G component sub-band. The embedding method is based on three-level discrete wavelet transform (DWT). A threshold is used to generate frequency of watermarks with the comparison of created frequency of DWT in embedding position. Experimental results show that the algorithm is robust against various kinds of attacks such as salt & pepper noise addition, cropping, scaling JPEG compression, mean filtering, copy and pasting and so on.