Volume 14 Issue 1
Mar.  2017
Article Contents

Phuchong Sripolsaen, Pradit Mittrapiyanuruk, Pakorn Keawtrakulpong. A High Speed Autofocusing System for Micro System Applications[J]. Journal of Electronic Science and Technology, 2016, 14(1): 73-79. doi: 10.11989/JEST.1674-862X.510051
Citation: Phuchong Sripolsaen, Pradit Mittrapiyanuruk, Pakorn Keawtrakulpong. A High Speed Autofocusing System for Micro System Applications[J]. Journal of Electronic Science and Technology, 2016, 14(1): 73-79. doi: 10.11989/JEST.1674-862X.510051

A High Speed Autofocusing System for Micro System Applications

doi: 10.11989/JEST.1674-862X.510051
Funds:

This work was supported by Thailand Research Fund and Solimac Automation Co., Ltd. under the TRF Master Research (TRF-MAG) under Grant No. MRG555E058. It is also partially supported by National Research University Project of Thailand.

More Information
  • Author Bio:

    Phuchong Sripolsaen research interests machine vision and industrial automation, phuchong.sri@outlook.com;
    Pakorn Kaewtrakulpong research interests include machine vision, industrial automation, and instrumentations, pakorn.kae@kmutt.ac.th;
    Pradit Mittrapiyanuruk, praditm@g.swu.ac.th.

    Phuchong Sripolsaen research interests machine vision and industrial automation, phuchong.sri@outlook.com;
    Pakorn Kaewtrakulpong research interests include machine vision, industrial automation, and instrumentations, pakorn.kae@kmutt.ac.th;
    Pradit Mittrapiyanuruk, praditm@g.swu.ac.th.

  • Authors’ information: Phuchong Sripolsaen
  • Received Date: 2015-10-05
  • Rev Recd Date: 2015-12-02
  • Publish Date: 2016-03-25

通讯作者: 陈斌, bchen63@163.com
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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A High Speed Autofocusing System for Micro System Applications

doi: 10.11989/JEST.1674-862X.510051
Funds:

This work was supported by Thailand Research Fund and Solimac Automation Co., Ltd. under the TRF Master Research (TRF-MAG) under Grant No. MRG555E058. It is also partially supported by National Research University Project of Thailand.

  • Author Bio:

  • Corresponding author: Phuchong Sripolsaen

Abstract: In this paper, we present a high speed autofocus system for micro system applications and design a look-up-table based autofocusing algorithm for applications when a target object is always visible, e.g., manufacturing parts with alignment fiducials. We perform an evaluation of 24 focus measures to verify that which focus measure is the best for the look-up-table based method. From the evaluation, we find that the Chebyshev moments-based focus measure (CHEB) is the most suitable. Furthermore, we also develop a look-up-table based autofocus system that uses CHEB as the focus measure. In training phase, we offline construct a table from training images of an object that are captured at several lens distances. Each entry of table consists of focus measure computed from image and lens distance. In working phase, given an input image, the algorithm first computes the focus measure and then finds the best match focus measure from the table and looks up the corresponding lens position for moving it into the in-focus position. Our algorithm can perform autofocusing within only 2 steps of lens moving. The experiment shows that the system can perform high speed autofocusing of micro objects.

Phuchong Sripolsaen, Pradit Mittrapiyanuruk, Pakorn Keawtrakulpong. A High Speed Autofocusing System for Micro System Applications[J]. Journal of Electronic Science and Technology, 2016, 14(1): 73-79. doi: 10.11989/JEST.1674-862X.510051
Citation: Phuchong Sripolsaen, Pradit Mittrapiyanuruk, Pakorn Keawtrakulpong. A High Speed Autofocusing System for Micro System Applications[J]. Journal of Electronic Science and Technology, 2016, 14(1): 73-79. doi: 10.11989/JEST.1674-862X.510051

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