2-dimensional code reader

Details 2-dimensional code reader 2-dimensional code reader

1998-10-21

2000-10-24

Le, Thien M.

Registers

Coded record sensors

Particular sensor structure

23546225, G06K 710

Patent

active

061353531

ABSTRACT:
A 2-dimensional code reader includes a camera for scanning a surface which carries a 2-dimensional code thereon, an amplifier for amplifying electric signals fed from the camera, a device for identifying a code-region out of the scanned surface and a device for detecting information contained in the 2-dimensional code. The amplifying rate or gain is controlled according to a signal level representing a brightness of the identified code-region, not depending on a brightness of a whole scanned surface. The amplifier may includes an automatic gain controller which controls the amplifying rate according to the brightness of the whole scanned surface. In this case, the amplifying rate is adjusted based on an areal ratio of the code-region to the whole scanned surface area to obtain a clear image of the code, irrespective of the brightness of the scanned surface. Some symbol marks may be included in the 2-dimensional code in order to effectively identify the code-region on the scanned surface.

REFERENCES:
patent: 5484990 (1996-01-01), Lindacher et al.

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