Image registration method and apparatus

Details Image registration method and apparatus Image registration method and apparatus

1989-12-13

1991-05-28

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 44, 358 60, 358231, 358236, 358237, G06K 932

Patent

active

050201166

ABSTRACT:
An image registration system for registering multiple images on a screen is disclosed. A single registration sensor, such as a photodetector, is disposed at an image plane of the system, typically adjacent an edge of the image plane of an image whose position is to be controlled and registered. A sensor mask having a square opening is disposed adjacent the photodetector, and between the image projector and the photodetector. A calibration light pattern is generated, illuminating the entire active area of the photodetector during a calibration time interval. The photodetector output is saved as a calibration value. A vertical test pattern is generated nominally illuminating only one vertical half of the sensor active area, and the sensor output is saved as a vertical pattern value. A horizontal test pattern is generated, nominally illuminating only one horizontal half of the sensor active area, and the sensor output is saved as a horizontal pattern value. The calibration, vertical pattern and horizontal pattern signals are then processed to provide image position correction signals.

REFERENCES:
patent: 3033073 (1962-05-01), Shuttleworth
patent: 4085425 (1978-03-01), Hamill
patent: 4127322 (1978-11-01), Jacobson et al.
patent: 4683467 (1987-07-01), Macaulay et al.
patent: 4684996 (1987-08-01), Baumeister
patent: 4816908 (1989-03-01), Colineau et al.

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