Surface profiling of object using varifocal lens with image contrast

Chih Yen Chen, Lijuan Wang, Chen Liang Fan, Pi-Ying Cheng, Chun Jen Weng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The measurement of automated and fast focusing on the improvement of speed and accuracy is an important issue in industrial inspection and biomedical microscopy. In this study, we developed a novel optical imaging system in which varifocal lenses are used to characterize the 3D surface topography of samples. The performance of the proposed system was evaluated using twelve focusing algorithms. Experimental results demonstrate the feasibility and effectiveness of the proposed system in the near real-time construction of multi-focus fusion images with large depth of field from which to derive 3D surface profiles.

Original languageEnglish
JournalOptical Review
StateAccepted/In press - 1 Jan 2019


  • Displacement measurement
  • Focusing algorithms
  • Sharpness
  • Surface topography
  • Varifocal lens


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