Autofocus system and method using focus measure gradient
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United States of America Patent
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May 26, 2009
Grant Date -
N/A
app pub date -
Jan 23, 2003
filing date -
Jan 23, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Described are autofocusing algorithms and system implementations for machine inspection applications. The disclosed algorithms depend neither on the type of image (visual, infrared, spectrometric, scanning, etc.) nor on the type of image detector. Disclosed image filtering techniques, image focus measure functions and adaptive velocity control methods can be used in computer-based inspection systems for many different types of cameras and detectors as well as for a variety of magnification levels. The proposed autofocusing system can utilize the existing imaging hardware of the inspection system and does not require any additional components.
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