文档介绍：摘 要
印刷品是传递信息的重要途径之一，而印刷行业目前对版权进行保护的手段
相对成本较高，如果可以将数字水印应用于印刷品的版权保护上，将极大地降低
防伪的成本并提高其安全性。
本文以使用数字水印进行印刷品防伪为研究重点，选择奇异值分解作为水印
的载体，以克服印刷、扫描过程中造成的信息失真。同时，针对应用的不同场合
中对水印算法的速度、精度以及系统成本的不同要求，提出了两个水印算法：一
是基于混沌序列和奇异值分解的无意义印刷数字水印算法，用于快速大量检测水
印的场合；二是基于奇异值分解的有意义印刷数字水印算法，适用于检测结果要
求高精度、高可靠性的情况。必要时使用这两种算法进行高低搭配检测，有很好
的实用性。
同时针对两种算法的不同，设计了两套不同的系统方案：一种是基于
TMS320VC5509A 的无意义数字水印监测系统。这套方案的特点在于能够快速地检
测印刷品的真伪，功耗小，便于携带。另一种是基于 TMS320DM642 处理器的有
意义数字水印监测系统，该套方案能够更加准确、直观地对印刷品进行检测和认
证。
在文章的最后，对本文的算法进行了详细的测试以及比较。实验证明、这两
种算法能满足检测的需求，并较目前常用的算法有更高的精度。
关键词：半脆弱印刷数字水印，奇异值分解，VC5509A，DM642
I
Abstract
Printed images are one of the most valuable media for information transmission. With
this great importance, it is that the anti-counterfeiting methods for printed media are
relatively scarce and expensive. A substantial cost reduction with huge performance
improvement could be achieved if we could apply the digital watermarking to
presswork for copyright protection.
This paper is focused on applying digital watermarking to printed images and
chooses Singular Value Decomposition as the vehicle for watermark embedding to
confront the distortion incurred by the printing and scanning process of images. This
work proposes two algorithms and systems for printed digital watermarking, satisfying
different requirements for accuracy, speed, and system costs in various situations. One
is Meaningless Printed Digital Watermark and corresponding system based on
TMS320VC5509A DSP. This system excels in its fast detection and low power
consumption. The other is Meaningful Printed Digital Watermarking, which could give
more accurate and intuitionistic detection results. Besides work separately, these two
systems can collaborate to achieve a relatively good accuracy and cost trade-off.
Also the performance of the two algorithms are tested and compared wi