Method of and video system for identifying different light-refle

Details Method of and video system for identifying different light-refle Method of and video system for identifying different light-refle

1976-04-02

1977-06-07

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358107, 356237, 250225, 250562, H04N 718

Patent

active

040287289

ABSTRACT:
Article surface defect detection methods and closed-circuit video systems for use therewith are disclosed for discriminating between different types of light-reflective surface areas on articles. Such methods and systems are particularly adapted to ascertain the presence and absence of, as well as condition of, circuit paths and satisfactory versus unsatisfactory soldered connections on printed circuit boards. In order to optimize the contrast between such two-dimensional and three-dimensional light-reflective surface areas, a specially oriented and polarized screen is interposed between the light source and article surface to be examined, and a rotatably adjustable polarized filter is preferably mounted on the camera, with the axis of the lens system thereof being oriented substantially perpendicularly to both the polarized light rays and the exposed article surface to be examined.

REFERENCES:
patent: 3713741 (1973-01-01), Sheehan
W. P. Shaw, High-Speed Automatic Particle Counter, 2-75, p. 2588, I.B.M. Technical Disclosure Bulletin.
E. E. Haas, Surface Defect Detector, 1-72, p. 37, Western Electric Tech. Dig. No. 25.

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