Image analysis – Histogram processing – For setting a threshold
Patent
1987-10-23
1989-03-07
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 56, 358106, 356237, G06K 903
Patent
active
048114103
ABSTRACT:
Inspection of a surface (14) on a circuit board (10) to detect for defects, such as misinserted leads (18--18) or missing or mis-sized components (20'--20'), is accomplished by directing beams of light (34--34) towards the surface along a first angular direction. The intensity of the light reflected along a second direction from each of a plurality of successive thin strips (40--40) running across the surface (14) is sensed by a linescan camera (36) which moves relative to the circuit board. The output signals produced by the linescan camera, as the linescan camera moves across the circuit board, are processed to obtain image data representative of each of the strips. Only the image data representative of predetermined regions (75--75) within each strip where defects may occur are retained. The retained image data are then analyzed to determine if defects are present.
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Amir Israel
Balchunas William C.
Higgins Frank P.
American Telephone and Telegraph Company
Boudreau Leo H.
Daley Donald J.
Levy Robert B.
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