A novel auto-focus function

Jian Wang; Hongbin Chen

doi:10.1117/12.970405

15 October 2012 A novel auto-focus function

Jian Wang, Hongbin Chen

Proceedings Volume 8420, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical System Technologies for Manufacturing and Testing; 842012 (2012) https://doi.org/10.1117/12.970405
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

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.

Citation Download Citation

Jian Wang and Hongbin Chen "A novel auto-focus function", Proc. SPIE 8420, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical System Technologies for Manufacturing and Testing, 842012 (15 October 2012); https://doi.org/10.1117/12.970405

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