从焦点检测的历史背景出发，结合光学的成像原理，提出了以图像梯度为对焦评价函数的自动调焦技术。
Through studying the historical background of the focus detection and principles of optical imaging, the auto focusing system adopts image gradient as the auto focusing evaluation function.
构建了适于生产线检测的自动对焦系统，并成功地实现快速调焦。
The auto-focusing system for camera module production line has been set up and it can focus fast as well as accurately.
一种新的采用基准离焦信号的针孔调焦方案，用于激光直写的自动对焦子系统。
A new pinhole-focusing scheme using referenced defocus signal is applied to an automatic subsystem for laser direct writing.
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