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.
- Research Organization:
- Nevada Test Site (NTS), Mercury, NV (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC52-06NA25946
- Assignee:
- National Security Technologies, LLC
- Patent Number(s):
- 9,658,444
- Application Number:
- 14/539,962
- OSTI ID:
- 1358242
- Resource Relation:
- Patent File Date: 2014 Nov 12
- Country of Publication:
- United States
- Language:
- English
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