Track gauges for aligning and focussing the imaging system in a

Details Track gauges for aligning and focussing the imaging system in a Track gauges for aligning and focussing the imaging system in a

1990-06-04

1991-11-26

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358406, 358475, 356381, 250560, 382 45, G06K 7015

Patent

active

050689126

ABSTRACT:
A set of track gauges for use in aligning, focussing and normalizing an imaging system of a high speed document processor have been provided. Each of the gauges fit within a track (14) in front of the imaging system (10 or 12). The depth gauge (70) is used to align the secondary light beam (26) with the primary light beam (22) so that all documents passing through the track (14) will be evenly illuminated from two points symmetrically offset from a line normal to the track (14). In addition, the depth gauge (70) is used to align a normally reflected beam (32) with a photodector array (56). Two different trunnion mirrors (54 and 28) are adjusted in the two different alignment operations. The focussing guage (80) includes a set of black 87 and white 88 strips positioned on a middle region 86. The white reference gauge (90) has a reflective white coating in its middle region 96. An oscilloscope (100, 210, 300, or 400) is used to display the intensity of reflected light (32) impinging on the photodector array (56) duringy all optical alignment and focussing operations.

REFERENCES:
patent: 4408231 (1983-10-01), Bushaw et al.
patent: 4464081 (1984-08-01), Jacobs et al.
patent: 4623938 (1986-11-01), Asano et al.
patent: 4751376 (1988-06-01), Sugiura et al.
patent: 4912567 (1990-03-01), Nakajima et al.

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