一种基于DWT-SVD算法的DSP数字水印系统设计

Design of DSP Digital Watermarking System Based on DWT-SVD Algorithm

文章给出了一种基于DWT-SVD的抗几何攻击的彩色图像水印算法,该算法将水印信息嵌入在载体图像CIEL*a*b*颜色模型的亮度空间中,并对载体图像进行打印机输出和各种攻击处理;然后利用TMS320DM642硬件平台实时采集含水印图像,进行水印的检测与提取;最后利用Matlab对采集的载体图像和提取的水印图像进行性能评估;实验结果表明,本水印算法对抵抗打印扫描过程中的几何攻击具有很好的鲁棒性,而且系统完成了水印算法的DSP硬件实现,该算法将有利于推动数字水印技术的理论研究与应用推广的发展。

This paper puts forward an image watermarking algorithm which can resist geometrical attacks based on the DWT and SVD theory. This algorithm embeds the watermark information into the brightness space of the carrier image＇s CIEL ＊a＊b＊ color model and it does some attack process to the carrier image and prints it out. Then this system captures the watermarked image real--time by use of the TMS320DM642 hardware platform and then does watermark detection and extraction. Last, it evaluates quality of the collected image with watermarked and the extracted watermark image on Matlah. Experimenta1. results show that, this watermarking algorithm has excellent ro bustness to resist geometric attacks, and completes the realization of this algorithm in DSP hardware platform. This system will greatly accelerate the research of digital watermarking technology theory and the development of application and extension.