Apparatus for generating edge position signals for use in locati

Details Apparatus for generating edge position signals for use in locati Apparatus for generating edge position signals for use in locati

1987-10-20

1988-11-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250223R, G01N 2186

Patent

active

047822384

ABSTRACT:
The edges of address elements such as address labels and window apertures located on a mailpiece, are detected by utilizing illumination from first and second alternating "on" and "off" light sources which illuminate the address elements at an acute angle. In the case of label detection, the edge closest to the on illuminating source generates a high contrast image, while the edge furthest from the "on" illuminating source is shadowed. In the case of illumination of an aperture, the opposite is true. That is, the light reflected from the edge which is furthest from illuminating source is high contrast, while edge closest to the illuminating source has a lower contrast. When the images generated due to edge illumination by the left and right light sources are subtracted from each other, the edges are further enhanced due to the fact that the remaining portions of the images cancel each other out.

REFERENCES:
patent: 3890509 (1975-06-01), Maxey
patent: 3932755 (1976-01-01), Sagawa
patent: 4011447 (1977-03-01), Henderson
patent: 4112309 (1978-09-01), Nakajawa et al.
patent: 4196648 (1980-04-01), Jones et al.
patent: 4301373 (1981-11-01), Sjodin
patent: 4691100 (1987-09-01), Kizu et al.

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