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

Abstract

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.

Inventors:
Publication Date:
Research Org.:
Nevada Test Site/National Security Technologies, LLC (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1358242
Patent Number(s):
9,658,444
Application Number:
14/539,962
Assignee:
National Security Technologies, LLC NSTEC
DOE Contract Number:
AC52-06NA25946
Resource Type:
Patent
Resource Relation:
Patent File Date: 2014 Nov 12
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

O'Neill, Mary Morabito. Autofocus system and autofocus method for focusing on a surface. United States: N. p., 2017. Web.
O'Neill, Mary Morabito. Autofocus system and autofocus method for focusing on a surface. United States.
O'Neill, Mary Morabito. Tue . "Autofocus system and autofocus method for focusing on a surface". United States. doi:. https://www.osti.gov/servlets/purl/1358242.
@article{osti_1358242,
title = {Autofocus system and autofocus method for focusing on a surface},
author = {O'Neill, Mary Morabito},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 23 00:00:00 EDT 2017},
month = {Tue May 23 00:00:00 EDT 2017}
}

Patent:

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