Method and apparatus for classifying a defect on a semiconductor wafer
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United States of America Patent
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Aug 24, 1999
Grant Date -
N/A
app pub date -
Oct 7, 1996
filing date -
Oct 9, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A surface image of a semiconductor wafer having a defect is picked up as a inspection image while a surface image of a semiconductor wafer having no defect is stored in an image memory as a reference image. A density difference image between the inspection image and the reference image. By extracting the defect in wiring and non-wiring regions from the density difference image, extract images are obtained. Two luminance information for wiring and non-wiring regions are obtained from extract images. Based on the luminance information, the type of the defect is determined and a production process where the defect has occurred is detect.
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