基于DCT与DWT的彩色图像数字水印算法  

Color Image Digital Watermarking Algorithm Based on DCT and DWT

作　　者：陆宇光[1,2] 龚声蓉[1] 

机构地区：[1]苏州大学计算机科学与技术学院,江苏苏州215021 [2]常州工学院计算机信息工程学院,江苏常州213002

出　　处：《常州工学院学报》2009年第1期19-22,48,共5页Journal of Changzhou Institute of Technology

摘　　要：提出一种基于DCT与DWT域的图像数字水印算法。该算法先将图像从RGB色彩空间转化到YIQ色彩空间,在YIQ模型中取其亮度分量Y进行二级DWT变换,然后再在小波变换的基础上进行DCT变换。根据人眼对图像的纹理和边缘不敏感的视觉特性,选择能量较大的块系数嵌入水印。实验结果表明,该方法可行,并具有较强的抗剪切、几何攻击性。A new algorithm with image digital watermarking based on DCT and DWT is proposed. The given color image is split into its three components in the YIQ color space firstly, then the luminance component Y is chosen and decomposed by two level DWT, the low frequency band is chosen and decomposed by DCT. According to the characteristics of Human Visual System （HVS）, insensitive to the image＇s texture and edges, the watermarking information is embedded into the larger energy blocks. Simulation result shows that the method is practicable with good robustness to, sheafing and geometric attacks.

关 键 词：数字水印 DCT DWT 图像置乱 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]