Autofocus method for scanning remote sensing cameras

	Autofocus method for scanning remote sensing cameras
	Lv, H.; C. S. Han; X. C. Xue; C. H. Hu and C. Yao
	2015
发表期刊	Applied Optics
卷号	54 期号:20 页码:6351-6359
摘要	Autofocus methods are conventionally based on capturing the same scene from a series of positions of the focal plane. As a result, it has been difficult to apply this technique to scanning remote sensing cameras where the scenes change continuously. In order to realize autofocus in scanning remote sensing cameras, a novel autofocus method is investigated in this paper. Instead of introducing additional mechanisms or optics, the overlapped pixels of the adjacent CCD sensors on the focal plane are employed. Two images, corresponding to the same scene on the ground, can be captured at different times. Further, one step of focusing is done during the time interval, so that the two images can be obtained at different focal plane positions. Subsequently, the direction of the next step of focusing is calculated based on the two images. The analysis shows that the method investigated operates without restriction of the time consumption of the algorithm and realizes a total projection for general focus measures and algorithms from digital still cameras to scanning remote sensing cameras. The experiment results show that the proposed method is applicable to the entire focus measure family, and the error ratio is, on average, no more than 0.2% and drops to 0% by reliability improvement, which is lower than that of prevalent approaches (12%). The proposed method is demonstrated to be effective and has potential in other scanning imaging applications. (C) 2015 Optical Society of America
收录类别	SCI ; EI
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/55180
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Lv, H.,C. S. Han,X. C. Xue,et al. Autofocus method for scanning remote sensing cameras[J]. Applied Optics,2015,54(20):6351-6359.
APA	Lv, H.,C. S. Han,X. C. Xue,&C. H. Hu and C. Yao.(2015).Autofocus method for scanning remote sensing cameras.Applied Optics,54(20),6351-6359.
MLA	Lv, H.,et al."Autofocus method for scanning remote sensing cameras".Applied Optics 54.20(2015):6351-6359.

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