Defect detection method
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United States of America Patent
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-
Sep 14, 1993
Grant Date -
N/A
app pub date -
Jan 21, 1992
filing date -
Jan 24, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An image of a light irradiated object is picked up by a video camera. Detection of defects on the object is conducted from the image signal from the video camera. Two inspection zones adjacent each other are established on the picture screen, each having a preset size. The brightness of each of the respective two inspection zones is sensed and accumulated as the inspection zones are indexed across the screen. When the difference between the accumulated values of the respective inspection zones exceeds a preset threshold value a defect is defined.
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