Bar code reader for accurately reading two-dimensional bar code

Details Bar code reader for accurately reading two-dimensional bar code Bar code reader for accurately reading two-dimensional bar code

1993-05-28

1995-01-03

Willis, Davis L.

Registers

Coded record sensors

Particular sensor structure

G06K 710

Patent

active

053788818

ABSTRACT:
A bar code reader includes an imaging element for recording a two-dimensional bar code, a frame memory for storing a two-dimensional bar code image recorded by the imaging element, and a bar code reading-control unit which finds coordinates of four corners of the two-dimensional bar code image stored in the frame memory, finds equations of four straight lines passing through four sides of the two-dimensional bar code image, sets a plurality of scan lines at equal intervals between those two of the four straight lines which cross two portions corresponding to start and end codes of the two-dimensional bar code image, and further sets a plurality of sampling lines at equal intervals between remaining two straight lines extending along the two portions, respectively, and samples the two-dimensional bar code image at positions corresponding to intersections between the scan lines and the sampling lines, whereby bar code information is read out from the two-dimensional bar code image.

REFERENCES:
patent: 4251800 (1981-02-01), Sanner
patent: 5134272 (1992-07-01), Tsuchiya

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