Method and apparatus for detecting significant difference of she

Details Method and apparatus for detecting significant difference of she Method and apparatus for detecting significant difference of she

1988-06-17

1990-12-04

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

356237, 358106, 382 34, 382 47, G06K 900

Patent

active

049759710

ABSTRACT:
A method of detecting a significant difference of a to-be-checked sheet includes the steps of: scanning a traveling to-be-checked sheet by a camera in the widthwise direction to obtain image data, extracting an outline of an image and an outline of a defect on the to-be-checked sheet from the image data, sequentially writing the outline data extracted in the outline extraction step in a memory with a predetermined cycle in accordance with travel position data and simultaneously reading out the outline data, comparing outline pattern data for an immediately preceding cycle as outline mask data with the latest outline pattern data obtained in a cycle following the immediately preceding cycle, and detecting a significant difference between the outline mask data and the latest outline pattern data in accordance with the comparison result obtained in the comparison step.

REFERENCES:
patent: 4614430 (1986-09-01), Hara et al.
patent: 4724481 (1988-02-01), Nishioka
patent: 4776466 (1988-10-01), Yoshida

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