A Creditability Validation Algorithm for Paper-Based Documents

It´s a challenge to identify whether the paper archive is credible when it is printed out by the credible electronic archives system. First, this paper improves a DCT-based binary image digital watermarking algorithm. The universal algorithm not only applies to text, but also other binary image. It´s so robust that can withstand more than three times attack of paper print-scans; the image is modified with good visual effects; watermark extraction does not require the original document. Based upon the algorithm, this paper designs and implements a creditability validation system for paper document.