Method and apparatus for inspecting objects for defects

Details Method and apparatus for inspecting objects for defects Method and apparatus for inspecting objects for defects

1979-11-01

1981-06-02

Punter, William H.

Optics: measuring and testing

Document pattern analysis or verification

250556, 356448, G06K 968, G01N 2147

Patent

active

042708630

ABSTRACT:
Labelled bottles are inspected by illuminating the labelled surface and generating brightness or intensity level signals for a plurality of points on the surface with a photo-sensitive diode array. Each intensity level signal is compared with a stored maximum intensity level and a stored minimum intensity level for the corresponding point. A difference signal is generated if the intensity level is greater than the maximum or less than the minimum intensity level. The difference signals are then weighted and summed to generate a figure of merit for the bottle being inspected. The figure of merit is compared with a predetermined value representing a "good" bottle in order to reject "bad" bottles. The maximum and minimum intensity levels can be generated by passing a plurality of known "good" bottles through the apparatus with labels distributed about the edges of the desired label area.

REFERENCES:
patent: 4075604 (1978-02-01), Degasperi
patent: 4139779 (1979-02-01), Ehrat
patent: 4150782 (1979-04-01), Ditmore, Jr.

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