Method for producing correct fingerprints.
Method for producing correct fingerprints.
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DOI：
10.1364/ao.47.000025
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发表时间：
2008
期刊：
影响因子：
1.9
通讯作者：
S. M. Rao
中科院分区：
文献类型：
--
作者：
S. M. Rao
利用直角棱镜通过全内反射产生指纹的传统方法不能给出真实尺寸的图像。在这种情况下，通过具有梯形失真的Scheimpflug条件形成失真的真实的图像。介绍了一种用单棱镜和直角棱镜相结合的方法进行变形拉伸，得到正确的指纹图像。详细讨论了构造这种光学系统的方法。该方法是有用的，直接获得正确的指纹使用CCD相机。
The conventional method of producing fingerprints by total internal reflection using a right-angle prism does not give true size images. In this case an anamorphic real image is formed by the Scheimpflug condition with keystone distortion. A method of combining a single prism with the right-angle prism for anamorphic stretching to get the correct fingerprint image is described. The method of constructing such a type of an optical system is discussed in detail. The method is useful to directly obtain the correct fingerprints using a CCD camera.