纸张残留痕迹成像系统之数据采集部分的研究

随着信息技术的高速发展，信息安全已越来越受到人们的普遍重视。特别是安全部门对文件的保密工作尤为重视，对机密文件的审阅人有严格的限制。介绍纸张上残留的痕迹(主要是汗潜指纹)的检测原理和工作过程。提取汗潜指纹通常采用的方法是用灰粉或墨粉进行处理，但在渗透性材料上，如纸张、硬纸板等最合适的方法是采用碘熏法。这些方法均会对检样造成不同程度上的损坏，为了保持原检样的完整性，提出了一种对纸张上的汗潜指纹进行检测与成像的新方法。通过检测纸张有痕迹和无痕迹处的阻抗，将此阻抗信号处理后，输入到计算机。

Research of data collecting part on testing and imaging system of remaining trace on paper

With the rapid development of information technology, information security has been given increasing attention. The security departments, in particular, have attached greater importance to the document secrecy and they impose strict restrictions on the readers of the secret documents. This article elaborates on the testing principles and working procedures of the remaining trace on paper (mainly invisible fingerprints of sweat). Now the generally accepted method to handle and collect invisible fingerprints of sweat is by means of lime or ink powder. And the most proper way on such penetrating material carriers as paper and cardboard is steaming iodine approach. However all the above mentioned methods will damage the testing samples differently. In order to keep the testing samples original, a new method is proposed to test and get image of the invisible sweat fingerprints. The new approach is to test the difference of resistance between the remaining trace in paper and non-remaining trace, and input the tested data into computer.