Method and apparatus for detecting minute irregularities on the surface of an object
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United States of America Patent
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Mar 27, 2001
Grant Date -
N/A
app pub date -
Nov 29, 1999
filing date -
Oct 27, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a method and apparatus of inspecting a surface of an object article capable of precisely detecting stains or miniature defects present in the object surface. Specifically, the invention provides a method of inspecting surface irregularity of an object article having a surface of uniform or regular brightness, which comprises the steps of: gaining brightness informations for a plurality of two-dimensionally distributed pixels by taking a picture of the article surface; finding stains on the article surface in response to each information obtained in the brightness information gaining step to produce a first output; finding miniature defects smaller in size than a unit pixel in response to each information obtained in the brightness information gaining step to generate a second output; switching the first output and the second output into appropriate electrical signals in an controlled manner; and displaying the switched electrical signals on a display in a viewable condition.
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