基于DCT和量化的彩色图像数字水印算法

Color Image Digital Watermarking Algorithm Based on DCT and Quantifying

给出了一种在DCT域中嵌入彩色图像数字水印的算法,首先对水印进行预处理,嵌入时将原始图像红、绿、蓝三个分量分别作DCT变换,选取变换后的低频系数作为嵌入系数,采用量化的方法嵌入水印。算法对于常见的图像攻击,特别是对图像的JPEG压缩具有较好的抵抗性。

A watermarking algorithm embedding color image watermarking into domain of DCT was presented. The algorithm preprocesses the digital watermarking. Then the watermarking message was embedded into the DCT coefficients of red, green and blue value of original image. The embedding procedure was based on quantify ing the DCT coefficients. The experiment result shows that the algorithm has a good robustness for several opera tions of image processing, especially for JPEG compression.