Research on image definition function use in a real-time autofocusing system

Guojin Chen; Kesong Zhang; Ye Gong; Guohua Xu; Huli Shi

doi:10.1117/12.521704

2 September 2003 Research on image definition function use in a real-time autofocusing system

Guojin Chen, Kesong Zhang, Ye Gong, Guohua Xu, Huli Shi

Proceedings Volume 5253, Fifth International Symposium on Instrumentation and Control Technology; (2003) https://doi.org/10.1117/12.521704
Event: Fifth International Symposium on Instrumentation and Control Technology, 2003, Beijing, China

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.

Citation Download Citation

Guojin Chen, Kesong Zhang, Ye Gong, Guohua Xu, and Huli Shi "Research on image definition function use in a real-time autofocusing system", Proc. SPIE 5253, Fifth International Symposium on Instrumentation and Control Technology, (2 September 2003); https://doi.org/10.1117/12.521704

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