Apparatus for detecting surface defects on running metal strip
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United States of America Patent
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May 15, 2001
Grant Date -
N/A
app pub date -
Jun 29, 1999
filing date -
Jul 21, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to an apparatus for detecting surface defects on a running metal strip (1), which comprises means (2) for illuminating the area (3) of the strip (1) to be inspected, at least one pair of cameras (4, 5) each periodically capturing an image of the same portion (6) of said area (3), a computing unit (7) comprising means for reconstructing a stereoscopic image of said portion (6) from the images provided by the pair of cameras (4, 5), means for detecting, on said stereoscopic image, those objects which exhibit a relief--as a projection or as an indentation--with respect to the surface of the strip (1) greater than a predetermined threshold, means for analyzing the images of said objects and means (10) for displaying the result of this analysis to the operator.
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