To focus in optical system and to determine the center of rotary table are common problems in many measurement systems.

对光学系统进行调焦和确定旋转工作台的中心对许多测量系统来说是一个共性问题。

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The position of the image and the amplitude variation in the optical field are associated with the focus and the distance from the object to the front focal plane of the lens system.

象的空间位置和光场振幅的变化与透镜系统的焦距以及物体距焦平面的位置有关。

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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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The Z80 features a 3X optical zoom, face detection and an intelligent focusing system that locks in the correct focus, while the Z200 rocks a 4X optical zoom and wide angle lens -- down to 28mm.

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