自动光圈

电视摄像镜头自动光圈控制方法的讨论

Discussion to Auto iris Control Method Used in Televison Camera Lens

它采用视频信号控制带有电子快门的CCD摄象机的积分时间以及平面电机自动光圈，实现宽范围全自动调光。

The full automatic light adjustment within a wide range is carried out by the integration time of CCD camera with an electron shutter and planar motor automatic iris controlled by video signal .

在光线极度阴暗的条件下，亦可以通过多点变焦自动光圈镜头捕捉图像。

The camera captures clear images under low-light conditions with a varifocal auto-iris lens .

这两款相机都能3.3-12毫米自动变焦光圈镜头。

Cameras feature a3.3-to12-millimeter varifocal auto-iris lens .

自动曝光，光圈优先（A），快门优先（S），手动曝光（M）

Programmed auto exposure , Aperture Priority Auto and Shutter Priority Auto , Manual exposure . ; AE lock .

但是，由于自动行动的光圈，这不是实际的平均状况亮度指示。

However , due to the action of an auto-iris , this is not indicative of actual average picture luminance .

如果你在使用自动模式、光圈优先模式或者快门优先模式，那么你已经选择了对相机曝光的大部分控制。

If you are shooting in automatic ( P ), aperture priority ( A or Tv ) or Shutter priority ( S ) modes you have opted to give up most of the control over exposure to the camera .

目前绝大多数数码相机都具备相当的自动曝光功能，其原理就是借助自动测光系统获得数码图像的最佳曝光依据，再自动配置光圈及快门来进行拍摄。

Most of the recent digital cameras are equipped with auto-exposure function whose principle is to get the optimal exposure quantity through photometric system and adjust the aperture and shutter automatically .

针对光圈自动调节对背景成像的影响，本文提出了背景自动补偿的前景分割算法，通过背景图像自动补偿来消除光圈影响。

For the aperture auto-adjusting , background auto compensation approach is proposed in this thesis to remove the effect by auto-compensating the background image .