Barcode scanner decoding

Details Barcode scanner decoding Barcode scanner decoding

2005-01-10

2008-03-04

Lee, Seung Ho (Department: 2876)

Registers

Coded record sensors

Particular sensor structure

C235S462010, C235S462120, C235S462240

Reexamination Certificate

active

07337970

ABSTRACT:
A two dimensional symbol is decoded by forming a sub-sampled image that is used to generate symbol margins for use in digitization. The sub-sampled image is based on local levels of contrast in the symbol. By using a sub-sampled image derived from local levels of contrast in the symbol to determine the symbol margins, margins can be located efficiently and in the presence of symbol contrast variation caused by irregularities in the marked surface or light source angles. Digitization proceeds based on the determined margins.

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2 pg Form PCT/ISA/210 PCT Int'l Search Report of Int'l App No. PCT/US05/43940; filed Dec. 2, 2005.

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