摘要
在农业科技服务系统构建中,关于农业科技信息的保护方面,提出一种基于复合混沌系统加密的数字水印嵌入算法,嵌入过程在要保护图像的RGB色彩空间经Contourlet变换后的域内进行。原始水印经过复合混沌加密后,重复嵌入到R、G、B各颜色分量的Cont-ourlet变换域低频分量中。水印提取时,可以根据R、G、B颜色分量Contourlet域低频系数值提取水印。实验结果证明,该水印算法可以抵抗JPEG压缩、中值滤波、加噪、剪切、旋转剪切等常规水印攻击,有效提升了水印的不可见性和鲁棒性。
Protection of agricultural science and technology information is a part of the construction of service system of agricultural science and technology.This article proposes a watermark embedding algorithms based on the encrypted complex chaotic system.The embedding process is implemented in RGB domain of the protected image,which is transformed in the Contourlet algorithms.The original watermark image is firstly encrypted through complex chaos scrambling technique and then repeatedly embedded into the Contourlet transform low frequency sub-band of RGB color components.The watermark can be retrieved according to the coefficients of low frequency sub-band of RGB color components.The experimental result showed that this algorithm can resist attacks,such as JPEG compression,median filtering,adding noise,cropping,rotating and so on,and it can also effectively promote the invisible and robust characteristic of the watermark.
出处
《安徽农业科学》
CAS
北大核心
2010年第27期15398-15401,15418,共5页
Journal of Anhui Agricultural Sciences
关键词
农业科技服务系统
混沌系统
数字水印
CONTOURLET变换
彩色图像
Service systems of agricultural science and technology； Chaotic system； Digital watermarking； Contourlet transform； Color image；
