Method of forming a mask in image processing operation
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United States of America Patent
Stats
-
Jun 14, 1994
Grant Date -
N/A
app pub date -
Aug 28, 1992
filing date -
Aug 28, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for examining the appearance of an examination object has the steps of taking an image of the object to obtain image data and processing the image data by an image processing apparatus. A mask is formed to determine, in the image data to be processed, a non-examination region of various configurations and, when the position of the examination object is deviated from the correct position, the position of the mask also is shifted correspondingly to enable appearance examination in varying conditions. To this end, a brightness threshold value is set in the input multi-value image data so as to define the non-examination region to be excluded from said examination region, thereby forming said mask, and the pixels having gradation levels not higher or lower than the threshold value are excluded from the examination region.
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