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该文提出了一个在打印文本中添加隐藏信息的方法.加入隐藏信息的文档在外观上与原文档不会有明显的差别.隐藏信息的提取在600dpi及以上分辨率下对打印扫描失真鲁棒.隐藏信息的载体是稀疏散布于页面上的微小的黑点,每一位信息通过一组点来存储.实验表明在打印文档受到诸如涂画,折叠等严重破坏时,信息提取仍能保持很高的正确率.“,”This paper presents a practical method for embedding and extracting hidden-data in printed documents. The embedding method ensures that the documents won't have any noticeable change after embedding and data recovery is robust to printing and scanning under 600 dpi resolution or above as well as other deterioration such as scratching and folding. The median for embedding data are tiny points that are sparsely scattered on the page and each bit of data is stored by a series of points. Experiment shows that the method has a high accuracy of data recovery after printing and scanning even when the page undergoes severe scratching and folding deterioration.