Method for inspecting the leads of electrical components on surf

Details Method for inspecting the leads of electrical components on surf Method for inspecting the leads of electrical components on surf

1989-08-28

1991-06-11

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

356237, 358106, G06K 900

Patent

active

050239163

ABSTRACT:
A method of inspecting solder joints that connect surface-mount electronic components to printed circuit boards is provided. Preferably, the method includes the steps of obtaining an image of a plurality of the leads of the electronic component, for each obtained image, representing segments of the image that correspond to each of the leads by polygons, projecting pixel intensity values within each polygon each onto an axial dimension to provide a measured waveform, comparing the measured waveform for each lead with a corresponding model waveform, and, classifying each lead as being either satisfactory or unsatisfactory on the basis of said comparisons.

REFERENCES:
patent: 4688939 (1987-08-01), Ray
patent: 4772125 (1988-09-01), Yoshimura et al.
patent: 4802231 (1989-01-01), Davis
patent: 4827533 (1989-05-01), Tanaka
Young & Fu, "Dynamic Programming Methods," Handbook of Pattern Eec. and Image Processing (Academic Press, 1986) pp. 501-509.

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