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Proceedings Paper

Research on image definition function use in a real-time autofocusing system
Author(s): Guojin Chen; Kesong Zhang; Ye Gong; Guohua Xu; Huli Shi
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Paper Abstract

Real time auto-focus systems based on image analyzing are different from other auto-focus systems based on range measuring in high precision of focusing and low accuracy demand of assembling and manufacturing the parts. To construct a real time auto-focus system based on image pattern recognition, the key is foundation of image definition and preprocessing methods for original image. The paper puts forward an image definition function arithmetic combining the power spectrum based on FFT with the wavelet filter based on Meyer's wavelet. Fast FFT can be realized with specialized hardware. It can improve the computing speed of image definition function and provide the auto-focus system based on image analyzing with a fine real time and high accurate model.

Paper Details

Date Published: 2 September 2003
PDF: 5 pages
Proc. SPIE 5253, Fifth International Symposium on Instrumentation and Control Technology, (2 September 2003); doi: 10.1117/12.521704
Show Author Affiliations
Guojin Chen, Xidian Univ. (China)
Hangzhou Institute of Electronic Engineering (China)
Kesong Zhang, Hangzhou Institute of Electronic Engineering (China)
Ye Gong, Sunny Group Co., Ltd. (China)
Guohua Xu, Xidian Univ. (China)
Huli Shi, Hangzhou Institute of Electronic Engineering (China)


Published in SPIE Proceedings Vol. 5253:
Fifth International Symposium on Instrumentation and Control Technology
Guangjun Zhang; Huijie Zhao; Zhongyu Wang, Editor(s)

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