Locating 2-D bar codes

Details Locating 2-D bar codes Locating 2-D bar codes

1993-06-01

1994-04-19

Hajec, Donald

Registers

Coded record sensors

Particular sensor structure

235470, 235463, 235494, G06K 710

Patent

active

053047877

ABSTRACT:
After a two-dimensional bar code is scanned to provide a stored image, the location (i.e., bounds, including orientation) of the bar code image within the scanned area image must be determined to enable decoding. Methods for locating the bar code image include the steps of sampling the stored image, identifying sampling traversals of bar code start and stop patterns, and correlating the identified start and stop pattern traversals to a common bar code image. The correlating data is then used to identify a nominally rectangular area bounding the bar code image. A bounding box may be identified as the smallest area capable of encompassing all of the start and stop pattern traversals related to a common bar code image. Output location data may specify the coordinates of the four corners of a bounding box for use in subsequent decoding. Related systems are described.

REFERENCES:
patent: 4728784 (1988-03-01), Stewart
patent: 4948955 (1990-08-01), Lee et al.
patent: 4988852 (1991-01-01), Krishnan
patent: 5138140 (1992-08-01), Siemiatkowski et al.

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