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Title: Autofocus system and autofocus method for focusing on a surface

An autofocus system includes an imaging device, a lens system and a focus control actuator that is configured to change a focus position of the imaging device in relation to a stage. The electronic control unit is configured to control the focus control actuator to a plurality of predetermined focus positions, and activate the imaging device to obtain an image at predetermined positions and then apply a spatial filter to the obtained images. This generates a filtered image for the obtained images. The control unit determines a focus score for the filtered images such that the focus score corresponds to a degree of focus in the obtained images. The control unit identifies a best focus position by comparing the focus score of the filtered images, and controls the focus control actuator to the best focus position corresponding to the highest focus score.
Issue Date:
OSTI Identifier:
National Security Technologies, LLC NSTEC
Patent Number(s):
Application Number:
Contract Number:
Resource Relation:
Patent File Date: 2014 Nov 12
Research Org:
Nevada Test Site/National Security Technologies, LLC (United States)
Sponsoring Org:
Country of Publication:
United States

Other works cited in this record:

Analog circuit for an autofocus microscope system
patent, November 1999

Optical biaxial angle sensor
patent, June 2007

Autofocus method
patent, August 2012

System and Method for Determining Image Focus by Sampling the Image at Multiple Focal Planes Simultaneously
patent-application, September 2011

patent-application, December 2014

Image Processing Apparatus And Method Of Controlling The Same
patent-application, February 2015

Fast autofocus algorithm for automated microscopes
journal, June 2005
  • Bueno-Ibarra, Mario Alonso; Álvarez-Borrego, Josué; Acho, Leonardo
  • Optical Engineering, Vol. 44, Issue 6, Article No. 063601
  • DOI: 10.1117/1.1925119

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