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Proceedings Paper

Autofocusing technique based on image processing for remote-sensing camera
Author(s): Xin Wang; Rong-chun Sun; Shu-yan Xu
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Paper Abstract

The key to the auto-focusing technique based on image processing is the selection of focus measure reflecting image definition. Usually the measures derived are on the premise of the images acquired with the same scene. As for the remote-sensing camera working in linear CCD push-broom imaging mode, the premise doesn't exist because the scenes shot are different at any moment, which brings about difficulties to the selection of the focus measure. To evaluate the image definition, the focus measure based on blur estimation for rough adjustment is proposed to estimate the focused position by only two different lens positions, which greatly saves the auto-focusing time. Another evaluation function based on edge sharpness is developed to find best imaging position in the narrow range. Simulations show that the combination of the two measures has the advantages of rapid reaction and high accuracy.

Paper Details

Date Published: 5 March 2008
PDF: 10 pages
Proc. SPIE 6623, International Symposium on Photoelectronic Detection and Imaging 2007: Image Processing, 66230F (5 March 2008); doi: 10.1117/12.791279
Show Author Affiliations
Xin Wang, Changchun Univ. of Technology (China)
Rong-chun Sun, Changchun Univ. of Science and Technology (China)
Shu-yan Xu, Changchun Institute of Optics, Fine Mechanics and Physics (China)

Published in SPIE Proceedings Vol. 6623:
International Symposium on Photoelectronic Detection and Imaging 2007: Image Processing
Liwei Zhou, Editor(s)

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