Aberration properties of off-axis freeform surface optical system

	Aberration properties of off-axis freeform surface optical system
	Shi, H.; X. Zhang; L. Wang; C. Wang and H. Jiang
	2016
发表期刊	Guangxue Xuebao/Acta Optica Sinica
卷号	36 期号:7
摘要	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. 2016, Science Press. All right reserved.
文章类型	期刊
收录类别	EI
语种	中文
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/57175
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Shi, H.,X. Zhang,L. Wang,et al. Aberration properties of off-axis freeform surface optical system[J]. Guangxue Xuebao/Acta Optica Sinica,2016,36(7).
APA	Shi, H.,X. Zhang,L. Wang,&C. Wang and H. Jiang.(2016).Aberration properties of off-axis freeform surface optical system.Guangxue Xuebao/Acta Optica Sinica,36(7).
MLA	Shi, H.,et al."Aberration properties of off-axis freeform surface optical system".Guangxue Xuebao/Acta Optica Sinica 36.7(2016).

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