Image analysis – Histogram processing – For setting a threshold
Patent
1991-09-18
1994-04-19
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
250223B, 356240, 382 50, 348127, G01N 2188, G06K 900
Patent
active
053053915
ABSTRACT:
A method of and an apparatus for inspecting a bottle or the like by which the presence or absence of a defect, particularly a check, can be determined with a high degree of accuracy. Light is irradiated upon an inspection area of a rotating or moving object, and reflected light is photographed by a two-dimensional camera which includes solid-state image pickup elements. Picture element data for a first frame are fetched at a first point of time from the two-dimensional camera and stored into a memory, and then picture element data for a second frame are fetched at a second point of time after a fixed interval of time after the first point of time. Then, differences of the picture element data for the second frame from the picture element data for the first frame from the memory are taken and binary digitized with reference to predetermined brightness threshold level, and the differences which have one of two binary values are counted. The count number is compared with a predetermined number to determine the presence or absence of a defect in the object being inspected.
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Boudreau Leo H.
Prikockis Larry J.
Toyo Glass Company Limited
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