Application of image processing to laser reflective pattern for multi-layer auto-focusing system

Yu Shih Hsu, Wei Yen Hsu, Shu Duan Fan, Hsiang Yen Lin, Chien Sheng Liu, Sheng Hong Jiang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

It is very important for laser auto-focusing systems in the applications of precise machining. The reflective laser area which is a semi-circular pattern is usually used to estimate the degree of defocusing. As work piece surface may be different in reflective properties and not always smooth, the reflective pattern is usually not a perfect semi-circle. In this study, a novel image processing algorithm is proposed to overcome this fault. Comparing with the conventional method based on the bias of gravity center, the results indicate that the proposed method can not only reconstruct the desired semi-circle back but also calculate the defocusing distant individually. After we use microscope and obtain images and perform the binary-valued image processing, we can clearly discriminate the border and structure of semicircle images and reduce the complexity of the processing of product images. The purpose of binary-valued processing is to discriminate the objects and background of images, so as to obtain the information of objects. We observe the changes of eccentric distance among images with the increases of the focal distance of microscope to determine the accuracy of microscope. The experiment results have shown the superiority of the sharpness measurement scheme we proposed.

Original languageEnglish
Title of host publication2013 7th International Conference on Sensing Technology, ICST 2013
Pages762-765
Number of pages4
DOIs
Publication statusPublished - 2013
Event2013 7th International Conference on Sensing Technology, ICST 2013 - Wellington, New Zealand
Duration: 2013 Dec 32013 Dec 5

Publication series

NameProceedings of the International Conference on Sensing Technology, ICST
ISSN (Print)2156-8065
ISSN (Electronic)2156-8073

Other

Other2013 7th International Conference on Sensing Technology, ICST 2013
CountryNew Zealand
CityWellington
Period13-12-0313-12-05

All Science Journal Classification (ASJC) codes

  • Artificial Intelligence
  • Computer Science Applications
  • Signal Processing
  • Electrical and Electronic Engineering

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