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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
收稿日期:2012-02-16,
修回日期:2012-04-26,
网络出版日期:2013-05-24,
纸质出版日期:2013-05-15
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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.
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。
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.
李威,李朝晖,颜昌翔,等.胶片型航空相机的快门设计和研究 \[J\]. 光学 精密工程,2005,13(增刊):9-14.LI W,LI ZH H,YAN CH X, et al.. Design and study on the shutter in a film-space camera \[J\]. Opt.Presicion Eng., 2005,13(supp):9-14. (in Chinese)[2]关澈,王延杰.CCD相机实时自动调光系统 \[J\]. 光学 精密工程,2008,16(2):358-365.GUAN CH,WANG Y J.Real-time auto light control system of CCD camera \[J\]. Opt. Presicion Eng., 2008,16(2):358-365.[3]KEHTARNAVAZ N, OH H J, SHIDATE I, et al.. New approach to auto-white-balancing and auto-exposure for digital still cameras \[J\]. SPIE,2002,4669:268-276.[4]KUNO T,SUGIURA H. A new automatic exposure system for digital still cameras \[J\]. IEEE Trans. On Consumer Electronics,1998,44(1):192-199.[5]\[苏\]H.n. 扎卡兹诺夫.航空摄影机的快门 \[M\]. 北京:科学出版社,1974.38-50.\[Rus\]H.n. Shutter of Aerial Camera \[M\]. Beijing:Science Press,1974:38-50. (in Chinese)[6]王庆有.CCD应用技术 \[M\].天津:天津大学出版社,2000,8.WANG Q Y. Technology of CCD Application \[M\].Tianjin: Tianjin Press. (in Chinese)[7]张雷,丁亚林,蒋贵德,等. 一种航摄快门帘缝宽度的优化 \[J\]. 光学 精密工程,2009,17(1):197-199.ZHANG L, DING Y L, JIANG G D. The optimization of breath of sew on shutter for aerial camera \[J\]. Opt.Presicion Eng.,2009,17(1):197-199.[8]张雷,丁亚林,蒋贵德.帘幕式快门曝光精度数学建模及计算 \[J\]. 光学 精密工程,2009,17(9):2098-2104.ZHANG L, DING Y L, JIANG G D. The accuracy analysis on exposure time of a curtain-type shutter \[J\]. Opt. Presicion Eng., 2009,17(9):2098-2104.[9]张洪文,冷雪,张继超,等.单帘正交组合式焦平面快门的设计与性能测试 \[J\]. 光学 精密工程,2011,19(3):587-592.ZHANG H W, LENG X, ZHANG J CH, et al..Design of focal plane-curtain shutter and its performance test \[J\]. Opt. Presicion Eng., 2011,19(3): 587-592.
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