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本文介绍了自动调焦虹膜图像采集系统的系统结构、工作流程,软硬件设计及其实现。采集系统主要由CCD摄像头,加装图像采集卡的控制计算机和调焦模块组成,其软件部分主要包括虹膜图像采集程序、图像聚焦质量评估程序和搜索调焦程序。系统的调焦机构主要由89C52单片机以及其他辅助芯片组成的驱动电路控制传动机构调节摄像头,具有调焦速度较快、精度较高,并且结构组成简单,设备成本较低等特点。
This paper introduces the system structure, work flow, hardware and software design and realization of auto-focusing iris image acquisition system. The acquisition system is mainly composed of CCD camera, control computer and image acquisition card. The software includes iris image acquisition program, image quality assessment program and search focusing program. The focusing mechanism of the system is mainly composed of 89C52 single-chip microcomputer and other auxiliary chip drive circuit control transmission mechanism to adjust the camera, with focusing speed, high accuracy, and the structure is simple, low cost equipment.