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Proceedings Paper

A novel auto-focus function
Author(s): Jian Wang; Hongbin Chen
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Paper Abstract

The one key problem of passive auto-focus technique based on image is image definition criterion which is estimated by auto-focus function.This paper analyzes the limitation of traditional spatial domain auto-focus functions which are not sensitive to small changes of images,and presents a new auto-focus evaluation function which uses the combination filters to strengthen the image medium-frequency information.In order to evaluate the new function performance,the parameters of unimodality,accuracy,sensitivity,calculating cost are compared and analyzed.Compared with the traditional spatial domain evaluation functions,such as Brenner function,Laplacian function and Tenengrad function,the experimental results show that the new function has a fast calculation speed,and has a high sensitivity.

Paper Details

Date Published: 15 October 2012
PDF: 6 pages
Proc. SPIE 8420, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical System Technologies for Manufacturing and Testing, 842012 (15 October 2012); doi: 10.1117/12.970405
Show Author Affiliations
Jian Wang, Institute of Optics and Electronics (China)
Graduate Univ. of Chinese Academy of Sciences (China)
Hongbin Chen, Institute of Optics and Electronics (China)


Published in SPIE Proceedings Vol. 8420:
6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical System Technologies for Manufacturing and Testing
Xiangdi Lin; Yoshiharu Namba; Tingwen Xing, Editor(s)

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