Method and apparatus for inspecting engine head valve retainer a

Details Method and apparatus for inspecting engine head valve retainer a Method and apparatus for inspecting engine head valve retainer a

1980-08-21

1983-08-16

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

356376, 356237, 358101, 382 22, 382 42, 382 55, G06K 900

Patent

active

043995543

ABSTRACT:
A computer vision system for inspecting engine heads during assembly for missing valve spring assembly keys comprises a solid-state camera for taking pictures of the valve spring assemblies and providing picture data upon command to a computer. The computer responds to a position encoder which relates the position of the engine head to the camera. Once the data is stored in the computer, it is analyzed to determine the center of the digitized image of the valve spring assembly and an intensity profile at the expected location of the keys relative to the center of the assembly is utilized to determine whether a key is missing.

REFERENCES:
patent: 4146924 (1979-03-01), Birk et al.
patent: 4296474 (1981-10-01), Hurt
Branaman, "Recent Applications of Electronic Vision to Noncontact Automatic Inspection", Proc. of the S.P.I.E., vol. 182, Apr., 1979, pp. 102-107.
Sumida et al., "Industrial Visual System by a Symmetry Operator", Proc. of the S.P.I.E., vol. 182, Apr., 1979, pp. 22-29.
Milgram, "Edge Linking Using Thresholding", Proc. of the S.P.I.E., vol. 205, Aug., 1979, pp. 139-144.
Olsztyn et al., "An Application of Computer Vision to a Simulated Assembly Task", Proc. of the First Int. Joint Conf. on Pattern Rec., 1973, pp. 505-513.

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