Adjustable exposure system for digital camera based on single curtain type shutter

Zhang Lei; DING Ya-lin; ZHANG Hong-wen; ZHANG Ji-chao; LIU Bo

doi:10.3788/OPE.20132105.1265

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Adjustable exposure system for digital camera based on single curtain type shutter

更新时间：2020-08-12

- Adjustable exposure system for digital camera based on single curtain type shutter
- Optics and Precision Engineering Vol. 21, Issue 5, Pages: 1265-1271(2013)
- 作者机构：
  
  中国科学院长春光学精密机械与物理研究所中国科学院航空光学成像与测量重点实验室,吉林长春,130033
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20132105.1265
  CLC： V447.3;TH761.6
- Received：16 February 2012，
  
  Revised：26 April 2012，
  
  Published Online：24 May 2013，
  
  Published：15 May 2013
- 稿件说明：
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张雷丁亚林张洪文张继超刘波. 基于单帘快门的数字相机调光系统[J]. 光学精密工程, 2013,21(5): 1265-1271

ZHANG Lei DING Ya-lin ZHANG Hong-wen ZHANG Ji-chao LIU Bo. Adjustable exposure system for digital camera based on single curtain type shutter[J]. Editorial Office of Optics and Precision Engineering, 2013,21(5): 1265-1271
张雷丁亚林张洪文张继超刘波. 基于单帘快门的数字相机调光系统[J]. 光学精密工程, 2013,21(5): 1265-1271 DOI： 10.3788/OPE.20132105.1265.

ZHANG Lei DING Ya-lin ZHANG Hong-wen ZHANG Ji-chao LIU Bo. Adjustable exposure system for digital camera based on single curtain type shutter[J]. Editorial Office of Optics and Precision Engineering, 2013,21(5): 1265-1271 DOI： 10.3788/OPE.20132105.1265.

摘要

采用单帘式快门配合CCD增益控制曝光量的调光方法，设计了面阵CCD相机的调光系统，以使面阵CCD相机在宽照度视场范围和较短的拍照周期内获得正确的曝光量。分析了航空成像传输过程中的影响因素，结合单帘式快门的曝光原理推导出曝光量的数学表达式。通过确定CCD的最佳曝光量，建立了快门狭缝速度、CCD增益和目标照度之间的对应关系。然后，由光电池采集地面目标的照度信号，根据采集的信号控制狭缝速度和CCD增益。最后，测试了快门辊轴的稳速精度。结果表明，对系统分别输入6 300、4 170和1 200 r/min的阶跃输入信号时，快门的稳速精度达到0.033。根据得到的稳速精度并考虑快门的曝光量误差，得到快门的曝光精度为0.091。在实验室进行了地面照相试验，测试系统获得的曝光量为1 833 DN，计算得到的系统曝光精度为0.066。结果显示利用单帘式快门和CCD增益相结合的方法能够使CCD获得正确的曝光量，捕获的图像满足使用要求。

Abstract

To obtain the perfect exposure in a wide illuminance range at a short period

an adjustable exposure system was designed for an area CCD camera in combination of a single curtain type shutter with controlling exposure by CCD gain. The effect factor on aero photographing process was analyzed

and a exposure expression was work out according to exposure principle of the single curtain type shutter. After confirming the optimized exposure amount of a CCD

the relationship among the slip rate

CCD gain and the illuminance of the ground target was established according to the exposure expression. Furthermore

the signal of a ground target illuminance was collected by a photosensitive resistance

then the signals were used to control the slip rate and the CCD gain. Finally

the rate accuracy of shutter roll shaft was tested at the input rates of 6 300

4 170 and 1 200 r/min

respectively. The result shows that the rate accuracy of shutter is 0.033，and the exposure accuracy is 0.091 according to combination of the computation results and exposure errors. A ground test on photographing was performed in a laboratory

and the results indicate that the exposure amount obtained is 1 833 DN and the exposure accuracy is 0.066. These results demonstrate that the method proposed can allow the CCD to obtain a proper exposure and captured images can meet the demands of CCD cameras.

关键词

Keywords

references

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中科院长春光学精密机械与物理研究所

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