Registers – Coded record sensors – Particular sensor structure
Patent
1993-04-08
1994-11-29
Willis, Davis L.
Registers
Coded record sensors
Particular sensor structure
235466, G06K 710
Patent
active
053692608
ABSTRACT:
Bar code scan data is corrected for spot-speed variation by processing the data to determine a spot-speed profile having non-zero acceleration within at least some of the characters of the bar code symbol being scanned, and then using the speed profile to normalize the scan data. Preferably, average spot speeds across individual characters are determined, and a speed profile is fit to these average spot speed data points in such a manner that the curve is not forced to pass through every data point. In this way, a spot-speed profile is derived that does not incorrectly attribute, to speed variation, errors due to other sources, e.g., random edge errors from printing. Preferably, the spot-speed profile consists of a plurality of straight line segments. The segments may be slightly disjoint, and each segment is from two to four characters in length, depending on the density of the bar code symbol.
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patent: 4276470 (1981-06-01), Rady et al.
patent: 4578570 (1986-03-01), Mazumder et al.
patent: 4705939 (1987-11-01), Ulinski, Sr.
patent: 4761544 (1988-08-01), Poland
patent: 5122645 (1992-06-01), Saeki et al.
Rashid Peter J.
Symbol Technologies Inc.
Willis Davis L.
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