Method of locating an object-applied optical code

Details Method of locating an object-applied optical code Method of locating an object-applied optical code

1997-12-30

2000-04-11

Frech, Karl

Registers

Coded record sensors

Particular sensor structure

23546208, G06K 710, G06K 936, G06K 980

Patent

active

060478934

ABSTRACT:
A method wherein an image of an object bearing an optical code is divided into a number of elementary images for which a brightness gradient vector is calculated. The calculated gradients of a magnitude above a given threshold value (Glim) are transformed to eliminate the information relative to the direction of the vector, while maintaining the information relative to the path of the vector. The transformed and quantized vectors of a subimage including a number of elementary images are added to calculate a total gradient vector, which is compared with reference values to select significant subimages containing a sufficient number of gradient vectors of substantially the same path.

REFERENCES:
patent: 4874936 (1989-10-01), Chandler et al.
patent: 5268580 (1993-12-01), He
patent: 5296690 (1994-03-01), Chandler et al.
patent: 5304787 (1994-04-01), Wang
patent: 5504319 (1996-04-01), Li et al.
European Search Report dated May 5, 1997 on Appln. No. EP 96 83 0661.

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