Real-time auto-focusing technique using centroid method for space camera

	Real-time auto-focusing technique using centroid method for space camera
其他题名	论文其他题名
	Kuang H.P.; Li Z.H.; Liu M.; Liu G.; Xiu J.H.; Zhai L.P.
	2007
发表期刊	Journal of Harbin Institute of Technology (New Series)
ISSN	10059113
卷号	14 期号:4 页码:577-579
摘要	A real-time auto-focusing system with auto-collimation method is introduced, which is used in auto-detecting the focus of the space camera with long focus. Auto-focusing is the key technique to ensure high quality in space imaging. It can measure and compensate the defocus caused by the change of temperature and air pressure etc. in space. To solve the problem of auto-focusing with auto-collimation method of the camera whose axis is perpendicular to the ground, it is designed that two small caliber pentagonal prisms are placed in the area of aperture suitable to the camera's relative aperture based on the theory of auto-focusing with auto-collimation, which can replace the big caliber plane reflector used in other cameras. Using the characteristic of pentagonal prism refracting light vertically, the target slit is imaged in CCD through the two-separated lens. It transforms the detecting of the axial defocusing quantity to the landscape orientation measurement of the faculae's position in the direction of CCD pixels. The defocusing quantity is obtained by measuring the opposite position of the two faculae on the CCD. The Centroid method is adopted to measure the position of the auto-collimation faculae. The arithmetic error is analyzed especially, and the causation is given. Experiments show that this real-time auto-focusing system using centroid method is reliable and the focusing precision can reach 0.01 mm.
收录类别	EI
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/24526
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Kuang H.P.,Li Z.H.,Liu M.,et al. Real-time auto-focusing technique using centroid method for space camera[J]. Journal of Harbin Institute of Technology (New Series),2007,14(4):577-579.
APA	Kuang H.P.,Li Z.H.,Liu M.,Liu G.,Xiu J.H.,&Zhai L.P..(2007).Real-time auto-focusing technique using centroid method for space camera.Journal of Harbin Institute of Technology (New Series),14(4),577-579.
MLA	Kuang H.P.,et al."Real-time auto-focusing technique using centroid method for space camera".Journal of Harbin Institute of Technology (New Series) 14.4(2007):577-579.

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