Camera-based barcode recognition

Details Camera-based barcode recognition Camera-based barcode recognition

2007-09-25

2007-09-25

St.Cyr, Daniel (Department: 2876)

Registers

Coded record sensors

Particular sensor structure

C235S462190

Reexamination Certificate

active

11077057

ABSTRACT:
Embodiments of the invention relate to decoding encoded barcode information from a series of camera-captured images by generating binarized sequences from the series of camera-captured images and decoding the encoded barcode information from the binarized sequences. A series of preprocessed images is generated from the series of camera-captured images by removing non-uniform illumination, reducing noise, and enhancing contrast between bars and spaces of the series of camera-captured images. Barcode-image orientations are estimated for the series of preprocessed images. The series of preprocessed images are projected along their respective barcode-image orientations to generate a series of gray-sequence images that represent barcode information in one dimension. The binarized sequences, each of which contains partial barcode information, are connected into a concatenated sequence according to computed shift information of neighboring binarized sequences.

REFERENCES:
patent: 5682030 (1997-10-01), Kubon
patent: 6042012 (2000-03-01), Olmstead et al.
patent: 6328213 (2001-12-01), He et al.
patent: 6508404 (2003-01-01), Hecht
patent: 6978937 (2005-12-01), Iwaguchi et al.

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