Laplacian-based focus measure allows rapid focus estimation of annular regions in gray-scale images

Ettore Masetti, Mario Ettore Giardini, Marco Ruggeri, Luigi Rovati

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

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Abstract

Important ophthalmic imaging techniques, such as fundus camera imaging, utilize light sources that need to be focused on an annular section of an eye surface. In order to be performed dynamically, this requires real-time control of the focus plane of the illumination optics. When considering adaptive focusing in ophthalmic instruments, liquid lenses represent the best compromise in terms of tunability, tuning range, compactness, numerical aperture, and speed. In recent years, several compact eye imaging devices using liquid lenses have been described in the literature. These would benefit from low computational complexity algorithms for adaptive local auto-focus on an annular region, to allow the illumination optics to be controlled by low-cost and low-power electronics. In this paper, we propose a novel radial-focus evaluation method based on a revised version of a more traditional Laplacian-based focus estimator. This radial focus evaluation is targeted to focusing annular sections of an image, with the advantage of a drastic reduction of computational complexity.
Original languageEnglish
Title of host publication2023 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)
Place of PublicationPiscataway, NJ
PublisherIEEE
ISBN (Electronic)9781665453837
DOIs
Publication statusPublished - 13 Jul 2023
EventIEEE International Instrumentation and Measurement Technology Conference (I2MTC 2023) - Kuala Lumpur Convention Centre, Kuala Lumpur, Malaysia
Duration: 22 May 202325 May 2023
https://i2mtc2023.ieee-ims.org/

Publication series

NameIEEE International Instrumentation and Measurement Technology Conference
PublisherIEEE
ISSN (Print)2642-2069
ISSN (Electronic)2642-2077

Conference

ConferenceIEEE International Instrumentation and Measurement Technology Conference (I2MTC 2023)
Country/TerritoryMalaysia
CityKuala Lumpur
Period22/05/2325/05/23
Internet address

Keywords

  • liquids
  • instruments
  • estimation
  • imaging
  • focus quality

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