A fast auto-focusing technique for the long focal lens TDI CCD camera in remote sensing applications

	A fast auto-focusing technique for the long focal lens TDI CCD camera in remote sensing applications
	Wang D.; Ding X.; Zhang T.; Kuang H.
	2013
发表期刊	Optics and Laser Technology
ISSN	ISBN/00303992
卷号	45 期号:1
摘要	The key issue in automatic focus adjustment for long focal lens TDI CCD camera in remote sensing applications is to achieve the optimum focus position as fast as possible. Existing auto-focusing techniques consume too much time as the mechanical focusing parts of the camera move in steps during the searching procedure. In this paper, we demonstrate a fast auto-focusing technique, which employs the internal optical elements and the TDI CCD itself to directly sense the deviations in back focal distance of the lens and restore the imaging system to a best-available focus. It is particularly advantageous for determination of the focus, due to that the relative motion between the TDI CCD and the focusing element can proceed without interruption. Moreover, the theoretical formulas describing the effect of imaging motion on the focusing precision and the effective focusing range are also developed. Finally, an experimental setup is constructed to evaluate the performance of the proposed technique. The results of the experiment show a 5m precision of auto-focusing in a range of 500mdefocus, and the searching procedure could be accomplished within 0.125 s, which leads to remarkable improvement on the real-time imaging capability for high resolution TDI CCD camera in remote sensing applications. 2012 Elsevier Ltd.
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/181722/40664
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Wang D.,Ding X.,Zhang T.,et al. A fast auto-focusing technique for the long focal lens TDI CCD camera in remote sensing applications[J]. Optics and Laser Technology,2013,45(1).
APA	Wang D.,Ding X.,Zhang T.,&Kuang H..(2013).A fast auto-focusing technique for the long focal lens TDI CCD camera in remote sensing applications.Optics and Laser Technology,45(1).
MLA	Wang D.,et al."A fast auto-focusing technique for the long focal lens TDI CCD camera in remote sensing applications".Optics and Laser Technology 45.1(2013).

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