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.
在如何选择对焦评价函数和对焦区域、如何进行反馈控制和如何提高对焦速度等方面，还有诸多问题有待解决。
Such as how to select focus functions and focus Windows, how to perform feedback control, and how to improve the auto-focusing velocity etc., are far from completely solved.
在软件上，主要是搜索算法的优化，还有对焦评价函数和对焦窗口的选择，以及相对于硬件上优化后所采取的一些改进。
About software, searching algorithm has been optimized. The focus evaluation function and the choice of the focusing window have also been described.
实验表明，经过预处理后明显改善了对焦评价函数曲线的形状：曲线更加平滑，局部峰值得以去除，同时曲线灵敏度提高78%。
The experiments show that the shape of focusing measure curve is obviously improved after pre-processing, the curve is smoother, local peak is eliminated and curve sensitivity is improved by 78%.
提出用交流分量到直流分量的距离作为加权因子对频谱评价函数进行改进，有效地提高了对焦评价曲线的灵敏度。
We revised frequency spectrum functions by using weighting factor - the distance between direct component and alternating component, and improved the acuity of focus measure curve.
提出用交流分量到直流分量的距离作为加权因子对频谱评价函数进行改进，有效地提高了对焦评价曲线的灵敏度。
We revised frequency spectrum functions by using weighting factor - the distance between direct component and alternating component, and improved the acuity of focus measure curve.
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