Influence of Brightness Gain on the Object-Background Contrast of an Image Intensifier
-
摘要: 亮度增益为微光像增强器的重要参数，影响微光夜视环境下以微光像增强器为核心的目标背景对比度测试结果精度。本文基于对比度测试原理，通过对不同亮度增益的ICCD进行目标背景对比度测试，分析得到亮度增益与目标背景对比度的变化关系及影响因素。测试结果表明：亮度增益分别为12000 cd/(m2·lx)、8300 cd/(m2·lx)、6000 cd/(m2·lx)时，环境照度在[2×10－3, 8×10－3](lx)区间内，目标背景对比度受亮度增益影响较小。照度在区间外时，受亮度增益影响，目标背景对比度测试结果可能失真。本文研究结果为提高ICCD目标背景对比度测试精度提供数据支持。Abstract: Brightness gain is an important parameter of low-light image intensifiers. It affects the accuracy of the object-background contrast in low-light night vision environments. Based on the principle of contrast tests, this study analyzes the relationship between the brightness gain and the object-background contrast, as well as influencing factors, via the object-background contrast test on an ICCD with different brightness gains. The results show that when the brightness gain is 12000, 8300, or 6000 cd/(m2·lx) and the ambient illuminance is within the range of [2×10－3, 8×10－3] (lx), the object-background contrast is minimally affected by the brightness gain. However, when the illuminance is outside this range, the object-background contrast test result may be distorted due to the influence of the brightness gain. The results of this study can guide the improvement of accuracy of ICCD object-background contrast tests.
-
Key words:
- image intensifier /
- ICCD /
- object-background contrast /
- brightness gain
-
图 2 三代微光像增强器的ABC曲线
Figure 2. ABC curve of the third generation low light level image intensifier
图 4 G＝12000 cd/(m2·lx)时照度与目标灰度的关系
Figure 4. Relationship between illuminance and target gray level when G＝12000 cd/(m2·lx)
图 5 照度-目标灰度在10－3 lx量级拟合直线
Figure 5. Illuminance-target gray fitted line in the order of 10-3lx
图 7 不同照度对应目标背景对比度的变化关系
Figure 7. Relationship between different illuminance and target background contrast
-
[1] 刘必鎏, 时家明, 赵大鹏, 等. 目标与背景的对比度分析及其应用[J]. 航天电子对抗, 2007, 24(3): 48-51. https://www.cnki.com.cn/Article/CJFDTOTAL-HTDZ200803019.htmLIU Biliu, SHI Jiaming, ZHAO Dapeng, et al. Analysis and application of object and background[J]. Aerospace Electronic Warfare, 2007, 24(3): 48-51. https://www.cnki.com.cn/Article/CJFDTOTAL-HTDZ200803019.htm [2] 韩坤, 姚泽, 乔凯, 等. 微光ICCD相机的动态调制传递函数理论模型研究[J]. 红外技术, 2020, 42(3): 294-299. http://hwjs.nvir.cn/article/id/hwjs202003013HAN Kun, YAO Ze, QIAO Kai, et al. Theoretical model of dynamic MTF of low-light-level ICCD[J]. Infrared Technology, 2020, 42(3): 294-299. http://hwjs.nvir.cn/article/id/hwjs202003013 [3] 向世明, 倪国强. 光电子成像器件原理[M]. 北京: 国防工业出版社, 1999.XIANG Shiming, NI Guoqiang. The Principe of Photoelectonic Imaging Devices[M]. Beijing: National Defense Industry Press, 1999. [4] 陈旭浪, 党小刚, 郭欣达, 等. 基于三代微光ICCD成像装置的目标对比度影响因素测试分析[J]. 应用光学, 2020, 41(6): 1241-1246. https://www.cnki.com.cn/Article/CJFDTOTAL-YYGX202006017.htmCHEN Xulang, DANG Xiaogang, GUO Xinda, et al. Test and analysis of factors influencing target contrast ratio based on 3rd generation LLL ICCD imaging device[J]. Journal of Applied Optics, 2020, 41(6): 1241-1246. https://www.cnki.com.cn/Article/CJFDTOTAL-YYGX202006017.htm [5] 田园. CCD图像对比度测试方法研究[D]. 长春: 长春理工大学, 2008.TIAN Yuan. Researching on the Testing Method of CCD Picture Contrast[D]. Changchun: Changchun University of Science and Technology. [6] 周建勋, 王利平, 徐志良. 像增强型夜视系统的图像信息传递[J]. 红外与毫米波学报, 1997, 16(4): 5. https://www.cnki.com.cn/Article/CJFDTOTAL-HWYH704.008.htmZHOU Jianxun, WANG Liping, XU Zhiliang. Image information transfer of image intensified night vision system[J]. Journal of Infrared & Millimeter Waves, 1997, 16(4): 5. https://www.cnki.com.cn/Article/CJFDTOTAL-HWYH704.008.htm [7] 汪丽, 田维坚, 王耀祥, 等. 光锥与CCD耦合器件调制传递函数的测试方法[J]. 光子学报, 2005, 34(4): 3. https://www.cnki.com.cn/Article/CJFDTOTAL-GZXB20050400X.htmWANG Li, TIAN Weijian, WANG Yaoxiang, et al. Measurement method for modulation transfer function of fiber optic taper coupled with CCD[J]. Acta Photonica Sinica, 2005, 34(4): 3. https://www.cnki.com.cn/Article/CJFDTOTAL-GZXB20050400X.htm [8] 王耀祥, 田维坚, 黄琨, 等. 光锥与CCD耦合效率的理论分析[J]. 光子学报, 2004, 33(3): 4. https://www.cnki.com.cn/Article/CJFDTOTAL-GZXB200403016.htmWANG Yaoxiang, TIAN Weijian, HUANG Kun, et al. Theoretical analysis of the coupling efficient between fiber taper and CCD[J]. Acta Photonica Sinica, 2004, 33(3): 4. https://www.cnki.com.cn/Article/CJFDTOTAL-GZXB200403016.htm [9] 程万胜, 赵杰, 菜鹤皋. CCD像素响应非均匀的校正方法[J]. 光学精密工程, 2008, 16(2): 103-108. https://www.cnki.com.cn/Article/CJFDTOTAL-GXJM200802024.htmCHENG Wansheng, ZHAO Jie, CAI Hegao. Correction method for pixel response nonuniformity of CCD[J]. Optics and Precision Engineering, 2008, 16(2): 103-108. https://www.cnki.com.cn/Article/CJFDTOTAL-GXJM200802024.htm [10] 吴厚德, 许文海. 多输出CCD接缝的校正[J]. 光学精密工程, 2013, 21(2): 454-461. https://www.cnki.com.cn/Article/CJFDTOTAL-GXJM201302031.htmWU Houde, XU Wenhai. Correction of seams for multiple output CCD[J]. Optics and Precision Engineering, 2013, 21(2): 454-461. https://www.cnki.com.cn/Article/CJFDTOTAL-GXJM201302031.htm [11] 袁鹏程. 基于像素光子转换特性的图传感器校正方法研究[D]. 哈尔滨: 哈尔滨工程大学, 2019.YUAN Pengcheng. Research on Image Sensor Correction Method Based on Pixel Transfer Characteristics[D]. Harbin: Harbin Engineering University, 2019. [12] 林祖伦, 王小菊. 光电成像导论[M]. 北京: 国防工业出版社, 2019LIN Zulun, WANG Xiaoju. Introduction to Optoelectronic Imaging[M]. Beijing: National Defense Industry Press, 2019. [13] 阴浩, 刘广荣, 金伟其, 等. 像增强型CCD成像系统的分辨力分析[J]. 光子学报, 2010, 39(S1): 96-100. https://www.cnki.com.cn/Article/CJFDTOTAL-GZXB2010S1023.htmYIN Hao, LIU Guangrong, JIN Qiwei, et al. Resolution analysis of image enhanced CCD imaging system[J]. Acta Photonica Sinica, 2010, 39(S1): 96-100. https://www.cnki.com.cn/Article/CJFDTOTAL-GZXB2010S1023.htm -
下载:
点击查看大图
图(8)
计量
- 文章访问数: 142
- HTML全文浏览量: 70
- PDF下载量: 40
- 被引次数: 0
