Tuning focal length of vari-focal lens for color 3D object reconstruction

Jing Sheuan Lin, Chun Jen Weng*, Pi-Ying Cheng

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


A color 3D object reconstruction system using varifocal lens with various focus algorithms was established in this study. The focal length of the varifocal lens can be regulated by varying the focal power. In this study, four categories of algorithms are applied into the system. The focal length of the system is adjusted by computer control, and the best focal length would be found by the algorithm. When the image of sample is in focus, the image will be the clearest. By finding the best focal length corresponding to each pixel position, we can convert to the height information for reconstructing the threedimensional surface profile.

Original languageEnglish
Article numberOPTM-P-03
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1 Jan 2019
EventOptical Technology and Measurement for Industrial Applications Conference 2019 - Yokohama, Japan
Duration: 22 Apr 201926 Apr 2019


  • 3D object reconstruction
  • color
  • focus algorithm
  • varifocal lens

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