自动对焦的过程就是运用爬山搜索算法求取对焦评价函数最大值的过程。
The procedure of auto-focusing is to getting the maximum of the focusing (evaluation) function employing the mountain-climb searching algorithm.
图像对焦越准确，高频分量的能量越多，系统的对焦评价函数反映了图像高频分量的能量。
The focusing evaluation function of the auto-focusing system is consistent with the energy of high frequency of the image.
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.
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