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On Image-Collecting, trapezoidal distortion is one of the most common distortion. We present a rectification method for it. In the case of knowing the focal distance and the size of CCD, the only parameter needed to know to restore the image is the angle of the camera axis with the ground.

摘要图像采集中的梯形失真是工程中最常见的失真之一，对此本文提出一种校正方法，在已知摄像机的镜头焦距和CCD大小的情况下，仅需要知道摄像机中轴线与地面的倾角一个参数，不需要控制点，就可以恢复原始图像。

The focal length of the camera lens plays an important role in photo criteria.

摄影机镜头的焦距在摄影规范中起着重要的作用。

If you don't want to spend the money to put a lens in shutter, focal plane Speed Graphics can be a very important part of your camera inventory.

如果你不想为了把透镜放入快门花费钱，焦点的平的速度制图法能是你的照相机财产目录的非常重要的部分。

Canon released the Hansa Canon in 1936, the first 35mm focal-plane shutter camera.

佳能发布hansa佳能公司在1936年第一次35毫米焦点平面快门照相机。

Then the relevant basic knowledge is introduced, which includes the classification of camera shutters, the meaning of some parameters, the design principles and work features of focal-plane shutter.

紧接着研究分析了照相机快门的分类和一些参数的含义以及焦平面快门设计原理和工作特性，具体分析了电磁控制式纵走单幕焦平面快门整体设计要求，并对整体和各功能组成部分进行了设计。

The camera pans back to reveal Joey and Chandler's new foosball table.

镜头显示出乔伊和钱德勒的新足球桌。

Recorded with the lander's robotic arm camera as it was maneuvered to look under the lander, the region also includes a leg and plate-sized footpad.

着陆器机械臂上的相机朝下拍摄，这个区域还包括一条支架和餐盘大小的防陷垫。

Gamma camera is composed of forepart electronics circuit, data acquisition system and data process system.

相机主要由前端电子学电路、数据采集系统以及数据处理系统组成。

Having the sphere in the center of the view press Ctrl+C to create a Camera and fix the chosen foreshortening. In

调整透视，（将所要表现的物体放置在画面的中间）然后按下Ctrl C来创建出摄像机，然后修正透视，之后按P键切换的透视图都会

The third, it put forward a solution of IP camera and its specifications.

依照现有条件和市场上已有的产品技术规格，提出了一个可行的设计方案。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。