基于TMS320DM642的摄像机自动调焦系统的实现

调焦系统在各种光学测量及侦察设备中起着十分重要的作用。本文介绍了光学系统自动调焦的方法和图像法调焦的相关评价函数，利用TMS320DM642数字信号处理芯片为平台设计了图像法自动调焦系统。采用TI公司针对其开发的DSP芯片设计了实时多任务系统DSP／BIOS，完成了软件设计。该实时操作系统为实现调焦过程中任务的调度和实时调焦提供了保障。文中还提出了在实现调焦系统过程中需要注意的一些问题及解决方案。本文所设计的系统能在4～5步（大约2S内）找到像面，满足实际应用的需要。

Realization of auto-focusing system for video cameras based on TMS320DM642 DSP

Focusing systems play an important role in a variety of optical measurements and detection instruments. In this paper, several kinds of auto-focusing methods were described and the relevant focusing evaluation functions were introduced based on image processing methods. An auto-focusing system based on image processing was designed by using the TMS320DM642 digital signal processing chip as a platform, and its programming was implemented by a real-time multi-tasking operating system DSP/BIOS developed by TI company. The real-time multi-tasking operating system provides a guarantee for the realization of task scheduling and real-time focusing. Moreover, some problems and solutions which are needed to pay attention in the realization of auto-focusing system were demonstrated. The system designed in this paper can find the image plane in 4-5 steps(about 2 s), which meets the requirements of practical applications.