The sharpness evaluation function of auto focus and search tactic was discussed based on the principle how blurred by the lens system in the chapter of the auto focus algorithms.
以镜头系统造成图像模糊的原理为基础，对常用的自动聚焦评价函数和搜索策略了进行论述。
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.
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。
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