Dsp-based Printing Of Digital Watermarking Algorithm Design

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 with other existing methods, and the results show that these algorithms can satisfy the designing requirements and have superior performance.