提出了一种小型非接触式三维指纹获取系统.该系统采用单个CCD相机作为图像传感器, 利用相机镜头结合双棱镜的成像装置在单帧CCD图像上获得立体图像对, 再基于立体视觉原理重建三维指纹.整个系统封装后尺寸为12 mm×12 mm×10 mm.基于该系统进行了指纹获取实验, 测量的均方根误差为0.022 mm.该系统操作简单且结构紧凑, 为三维指纹的获取提供了一种小型化方案.

A compact touchless 3D fingerprint acquisition system was proposed in this paper. The system utilizes a single CCD camera as an image sensor and combines the CCD with a biprism to obtain stereo image pairs in one frame of the CCD. Then 3D fingerprint is established based on the stereo vision technique. The entire size of the compact encapsulated system is 12 mm×12 mm×10 mm. The experiment of a forefinger fingerprint acquisition was conducted based on this system and the measurement root mean square error is 0.022 mm. This work is expected to provide a miniaturized solution for 3D fingerprint acquisition with its easy operation and compact structure.