On the basis of the precision analysis of focusing machine , we have tested the focusing principle of oblique photography , and do the experiment both on the ground and in the air . in the end , we draw the conclusion that the theory of the auto - focusing system is right and reasonable 在对调焦机构进行精度分析的基础上，对斜距调焦原理进行了实际检验及对相机进行了地面和飞行照相试验，表明斜视相机自动调焦系统的理论分析正确、设计合理可行。
According to the optics system of oblique camera , make certain the scheme of auto - focusing system , and analyze its principle in detail . this paper presents a new method in order to compensate out of focus of oblique photographic distance , the principle is very simple and it is steady and reliable for structure design 根据斜视相机光学系统的特点，确定了自动调焦系统方案，对其工作原理进行了详细的分析与论述，并通过对相机斜距离焦的分析，提出了一种新的斜距离焦补偿方法，其原理简单，结构上实现起来稳定可靠，能够完全实时补偿某一典型高度上的斜距离焦。
In reference 1 , based on optical principle , and using microscope " s f ocu sing method , a method of measuring the thickness and refractive index of transpa rent material is presented ; besides , according to the quantitative correspondenc e relationship between the refractive index and the density of some solution , a method of measuring the density of solution is presented too 文献1是根据光学原理，运用显微镜调焦方法提出了测量透明材料厚度和折射率的方法；在此基础上，根据不少溶液的折射率和浓度均有定量对应关系的特点，提出测定浓度的简易方法。
Sum - of - gradient - magnitude measure is chosen to adapt all images with different enlargement according to analysis of focusing measures ’ character . for 3d bond targets , it is explained that why focusing window should be placed accurately . efficiency of the whole system is ensured by analyzing shift of focal plane when enlargement ratio is changing 为了保证快速采集到键合器件的清晰图像,通过对调焦评价函数特征的分析,选择能够适应各个放大倍数显微图像的梯度作为系统的自动调焦评价函数;针对三维器件说明了调焦窗口正确放置的原则和必要性;分析了变倍过程中聚焦平面位置的变化规律,提高了自动调焦的效率。
