Method and apparatus for edge detection

Details Method and apparatus for edge detection Method and apparatus for edge detection

2005-06-07

2005-06-07

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

C250S22300B, C053S381700, C053S569000

Reexamination Certificate

active

06903359

ABSTRACT:
An embodiment of the present invention comprises a method and apparatus of detecting edges. Light directed from any angle at a smooth surface will not cast a shadow regardless of the printing on the surface. Light cast at an appropriate angle on a stepped surface casts a shadow. The apparatus and method of the present invention cast light from several directions/sources while focusing on one location. If the same level of gray is detected from all sources, there is no shadow and hence the location is not an edge. If the result of one or more of the light sources is a darker image than the others, there is indication of an edge by the presence of a shadow. The use of edge detection in an insertion machine can help to decrease the amount of user adjustment needed to operate the machine using various sizes of envelopes.

REFERENCES:
patent: 4782238 (1988-11-01), Radl et al.
patent: 6098374 (2000-08-01), Yates et al.
patent: 6164043 (2000-12-01), Miller et al.
patent: 6230076 (2001-05-01), Miller
patent: 6617602 (2003-09-01), Kodama et al.

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