Correction for scan period variation in optical image scanners

Details Correction for scan period variation in optical image scanners Correction for scan period variation in optical image scanners

1981-04-22

1983-01-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358293, H01J 314

Patent

active

043693652

ABSTRACT:
Correction for variations in scan period of optical image scanners includes measuring and storing the scan times at which optical events occur to cause image detector signals, detecting an optical marker near the end of the scan and the scan time of its detection, determining the difference between this scan time and a stored scan period, comprising the nominal scan time for marker detection, which difference represents the scan period error, dividing the difference by the stored scan period to provide a scan time unit error and multiplying each stored measured scan time by the unit error to provide a correction for each measured scan time, thereafter adding the correction to the stored measured scan time to give a corrected scan time.

REFERENCES:
patent: 4310757 (1982-01-01), Check et al.

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