基于直方图分析的航空摄像机自动调光方法研究

申小禾; 刘晶红; 楚广生

doi:10.11999/JEIT150530

基于直方图分析的航空摄像机自动调光方法研究

doi: 10.11999/JEIT150530

2.
(中国科学院长春光学精密机械与物理研究所长春 130033) ②(中国科学院大学北京 100049)

基金项目:

国家863高科技研究发展计划(2008AA121803)，中国科学院航空光学成像与测量重点实验室基金(2012MS06)

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出版历程
- 收稿日期: 2015-05-06
- 修回日期: 2015-12-02
- 刊出日期: 2016-03-19

Auto Exposure Algorithm for Aerial Camera Based on Histogram Statistics Method

2.
(Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China)

Funds:

The National 863 Program of China (2008AA121803), Funds of Key Laboratory of Airborne Optical Imaging and Measurement, Chinese Academy of Sciences (2012MS06)

摘要

摘要: 航空摄像机在空中对地面进行拍摄，拍摄场景复杂，传统的灰度平均值法在一些如有干扰点或背景与目标灰度差别大的场景下曝光会不正确，丢失图像信息，为了解决这些问题，该文在根据图像灰度信息的调光算法以及硬件实现方面进行了相关研究。首先根据当前帧图像的灰度直方图中灰度级为0和255附近的信息进行初调；然后根据图像直方图及其卷积和，搜索其中的峰值区域并确定图像的不感兴趣区域(包含的灰度级单一，信息量少的区域)；接着根据这些区域占整幅图像的比重，由权值分配曲线为其分配不同的权值；最后计算加权后的灰度平均值，并将其作为反馈量控制下一帧的调光。实验结果表明，在普通场景下能够准确曝光，在暗背景和亮背景场景下，相比传统方法使图像感兴趣区域信息熵提高10%以上。此方法能适用于多种场景，满足航空摄像机对复杂场景自动调光的需求。
- 图像处理 /
- 航空摄像机 /
- 灰度直方图 /
- 加权平均值 /
- 自动调光
Abstract: The aerial camera takes photographs from sky. Conventional auto exposure algorithms can not be suitable for some special scenes such as the background is bright or dark and few strong interference points exist. Unsuitable exposure causes information losing in images. In order to solve this problem, an algorithm based on gray value is proposed. Firstly, it regulates the exposure preliminarily using the information of the histogram near 0 and 255. Then it obtains the regions of no interest in the image through the convolution of the histogram and weighted different proportion for the regions according to their area in the entire image. Finally, the weighted average is computed, which is regarded as the feedback controlling exposure. Experimental results indicate that image entropy of regions of interest increased more than 10% in dark or bright background. This method is suitable for many scenes, and meets the demands of the aerial camera.
- Image processing /
- Aerial camera /
- Histogram /
- Weighted average /
- Auto exposure

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参考文献(30)

陶会锋, 杨华, 王一程, 等. 可调强光对可见光 CCD 摄像系统成像过程的干扰研究[J]. 红外与激光工程, 2014, 43(5): 1605-1609.

TAO Huifeng, YANG Hua, WANG Yicheng, et al. Study on interference to imaging process of visible CCD camera by adjustable light[J]. Infrared and Laser Engineering, 2014, 43(5): 1605-1609.

黄辉. 可见光相机调光调焦图像处理算法研究[D]. [硕士论文], 中国科学院光电技术研究所, 2014.

HUANG Hui. Research of automatic exposure and autofocus image processing algorithm for visible light camera[D]. [Master dissertation], Insititue of Optics and Electrics, Chinese Academy of Sciences, 2014.

郭惠楠. 彩色数字相机成像系统的关键性技术研究[D]. [博士论文], 中国科学院西安光学精密机械研究所, 2014.

GUO Huinan. Research on key technology of digital camera imaging system[D]. [Ph.D dissertation], Xian Institute of Optics Precision Mechanics, Chinese Academy of Sciences, 2014.

LIANG Jiayi, QIN Yajie, and HONG Zhiliang. An auto- exposure algorithm for detecting high contrast lighting conditions[C]. 7th International Conference on ASIC, Gulin, China, 2007: 275-278. doi: 10.1109/ICASIC. 2007. 4415733.

杨作廷, 阮萍, 翟波. 基于图像熵的高动态范围场景的自动曝光算法[J]. 光子学报, 2013, 42(6): 742-746. doi:10.3788/ gzxb20134206.0742.

YANG Zuoting, RUAN Ping, and ZHAI Bo. Auto-exposure algorithm for scenes with high dynamic range based on image entropy[J]. Acta Photonica Sinica, 2013, 42(6): 742-746. doi: 10.3788/gzxb20134206.0742.

王成艳, 刘晶红, 楚广生, 等. 图像场景区分与航空摄像机自动调光方法研究[J]. 液晶与显示, 2013, 28(6): 948-954. doi:10. 3788/YJYXS2013 2806.0948.

WANG Chengyan, LIU Jinghong, CHU Guangsheng, et al. Scene distinguish and aerial camera auto-dimming[J]. Chinese Journal of Liquid Crystals and Displays, 2013, 28(6): 948-954. doi:10.3788/YJYXS2013 2806.0948.

周杰. 基于多区域分割及模糊逻辑的自动曝光方法[D]. [硕士论文], 上海交通大学, 2007.

ZHOU Jie. Auto-exposure method bases on image segmentations and fuzzy logic[D]. [Master dissertation], Shanghai Jiao Tong University, 2007.

WANG Zefeng, YANG Lei, HUANG Jijiang, et al. The investigation of automatic exposure under extreme light[C]. The International Conference on Photonics and Optical Engineering (icPOE 2014), Xian, 2014, 94491W-1-94491W-5. doi: 10.1117/12.2074827.

杨海涛, 常义林, 王静, 等. 一种基于亮度直方图的自动曝光控制方法[J]. 光学学报, 2007, 27(5): 841-846.

YANG Haitao, CHANG Yilin, WANG Jing, et al. A new automatic exposure algorithm for video cameras using luminance histogram[J]. Acta Optica Sinica, 2007, 27(5): 841-846.

刘志国, 刘晶红. 机载可见光摄像机调光方法研究[J]. 液晶与显示, 2011, 26(2): 249-254. doi: 10.3788/YJYXS20112602. 0250.

LIU Zhiguo and LIU Jinghong. Automatic exposure algorithm for airborne visible light camera[J]. Chinese Journal of Liquid Crystals and Displays, 2011, 26(2): 249-254. doi: 10.3788/ YJYXS20112602.0250.

BRKER M, R?BINGC, and LENSCH H P A. Exposure control for HDR video[J]. Optics, Photonics, and Digital Technologies for Multimedia Applications Ⅲ, 2014, 9138(5): 1-12. doi: 10.1117/12.2051127.

TORRES J and MEN?NDEZ J M. Optimal camera exposure for video surveillance systems by predictive control of shutter speed, aperture and gain[J]. Real-Time Image and Video Processing, 2015, 9400(S): 1-14. doi: 10.1117/12. 2083182.

郭惠楠, 曹剑中, 周祚峰, 等. 彩色数字相机快速自动曝光方法[J]. 光学学报, 2013, 33(10): 1011003-1-1011003-7. doi: 10.3788/AOS 201333.1011003.

GUO Huinan, CAO Jianzhong, ZHOU Zuofeng, et al. Fast automatic exposure approach for color digital camera[J]. Acta Optica Sinica, 2013, 33(10): 1011003-1-1011003-7. doi: 10.3788/AOS201333.1011003.

焦继超, 赵保军, 唐林波, 等. 基于光照和帧间预测的空间图像曝光控制算法[J]. 光学学报, 2010, 30(2): 382-387. doi: 10.3788/AOS2010 3002.0382.

JIAO Jichao, ZHAO Baojun, TANG Linbo, et al. Exposure algorithm for space image based on light and inter prediction[J]. Acta Optica Sinica, 2010, 30(2): 382-387. doi: 10.3788/AOS20103002.0382.

张雷, 丁亚林, 张洪文, 等. 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 Yalin, ZHANG Hongwen, et al. Adjustable exposure system for digital camera based on single curtain type shutter[J]. Optics and Precision Engineering, 2013, 21(5): 1265-1271. doi: 10.3788/OPE. 20132105.1265.

黄辉, 周进. 基于现场可编程门阵列的CCD相机自动调光[J].光学精密工程, 2014, 22(2): 426-433. doi: 10.3788/OPE. 20142202.0426.

HUANG Hui and ZHOU Jin. Auto-exposure for CCD camera based on FPGA[J]. Optics and Precision Engineering, 2014, 22(2): 426-433. doi: 10.3788/OPE.20142202.0426.

SHIM Inwook, LEE Joon-young, and KWEON Inso. Auto- adjusting camera exposure for outdoor robotics using gradient information[C]. 2014 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2014), Chicago, 2014, 1011-1017. doi: 10.1109/IROS.2014.6942682.

GONZALEZ R C and WOODS R E. Digital Image Processing[M]. Second Edition, Beijing, Publishing House of Electronics Industry, 2007: Second Chapter.

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