Auto exposure control for high frame rate camera using image histogram feature function

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	Auto exposure control for high frame rate camera using image histogram feature function
	Ma, Z.-L.; H.-B. Gao; Y. Yu and L.-H. Cai
刊名	Guangxue Jingmi Gongcheng/Optics and Precision Engineering
	2017
卷号	25 期号:4
英文摘要	In this paper, a method for auto exposure based on image HF (Histogram Feature) function was proposed to achieve auto exposure control on high-speed camera under the condition where the background lumination was in fast speed and wide-range changes. First, multi-point photometry was conducted to extract the Regions Of Interest (ROI), thus lowering calculation amount of the photometric system; then, large step size was selected to carry out coarse adjustment of the exposure time by calculating HF function of these ROIs; finally, accurately-adjusted step size of the exposure time was calculated through fuzzy logic and then the optimal exposure time was achieved through variable-step search by using threshold limit, so accuracy and stability of the high-speed camera auto exposure were improved. The resuts show that proposed method is able to complete brightness measurement of one frame image as well as an adjustment in the exposure time within 2 ms; and compared with traditional auto exposure method based on average brightness, average information entropy achieved by proposed method is improved by 48.38% within 0-110 ms when the illumination intensity varies repeatedly from 760 lux to 23 100 lux, with a variance decreased by 62.13%. This method can provide better and more stable details on the image, which serves as useful reference for follow-up auto focusing, image recognition and target tracking. 2017, Science Press. All right reserved.
语种	中文
内容类型	期刊论文
源URL	[http://ir.ciomp.ac.cn/handle/181722/59133]
专题	长春光学精密机械与物理研究所_中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Ma, Z.-L.,H.-B. Gao,Y. Yu and L.-H. Cai. Auto exposure control for high frame rate camera using image histogram feature function[J]. Guangxue Jingmi Gongcheng/Optics and Precision Engineering,2017,25(4).
APA	Ma, Z.-L.,H.-B. Gao,&Y. Yu and L.-H. Cai.(2017).Auto exposure control for high frame rate camera using image histogram feature function.Guangxue Jingmi Gongcheng/Optics and Precision Engineering,25(4).
MLA	Ma, Z.-L.,et al."Auto exposure control for high frame rate camera using image histogram feature function".Guangxue Jingmi Gongcheng/Optics and Precision Engineering 25.4(2017).