Defect detecting method and device

Details Defect detecting method and device Defect detecting method and device

1981-06-11

1984-05-15

Sikes, William L.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

250223B, 250572, 356240, G01N 2100

Patent

active

044485263

ABSTRACT:
In a defect detecting method and device, image formed by receiving light from an illuminated object to be examined, is divided into a plurality of picture elements, and the signals of the picture elements are stored. The signals are later read out in the order in which the portions of the object corresponding respectively to the picture elements are traversed by a substantially spiral imaginary line drawn on said object, and a defect is detected from the relationship between the signal of one of the picture elements and the signal of another picture element read out a little before the reading of the signal of said one of the picture elements.

REFERENCES:
patent: 2649500 (1953-08-01), Fedorchak
patent: 3529167 (1970-09-01), Calhoun
patent: 3987244 (1976-10-01), Messman
patent: 4256957 (1981-03-01), Ford et al.
Mengers, "Digital Video Systems Applied to Product Inspection", Proc. SPIE, vol. 170, pp. 43-50 1979.

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