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Optical Engineering

Analysis of image motion on autofocus precision for aerial cameras
Author(s): Fanhao Meng; Yalin Ding; Dejiang Wang; Jihong Xiu
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Paper Abstract

Aerial cameras often suffer from image motion due to the severe aerial environments that decrease the autofocus precision. An analysis of the influence of image motion on autofocus precision is provided to obtain the optimal focus position. First, the focus measure function based on discrete Fourier transform is applied to evaluate the sharpness of the collected image for autofocusing. Then, two forms of image motion model, including linear shift and jitter, are discussed and analyzed. Finally, a quadratic fitting curve is employed on the focus measure function for image sequence. The maximum of the fitted curve corresponds to the optimal focus position. Experimental results demonstrate that the maximum value of the focus measure function decreases more than 10% approximately when the image motion increases to five pixels, and the optimal focus position computed by quadratic fitted curve generated a good performance in autofocus techniques. The proposed autofocus algorithm can be applied to aerial cameras.

Paper Details

Date Published: 7 August 2015
PDF: 9 pages
Opt. Eng. 54(8) 083102 doi: 10.1117/1.OE.54.8.083102
Published in: Optical Engineering Volume 54, Issue 8
Show Author Affiliations
Fanhao Meng, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Univ. of Chinese Academy of Sciences (China)
Yalin Ding, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Dejiang Wang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Jihong Xiu, Changchun Institute of Optics, Fine Mechanics and Physics (China)


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