Digital Design EVOLUTION II - Barcode Techniques

5 EVOLUTION 1 SYSTEM MANUAL Issue Issue 1.1 20 Dec 2006
BARCODE TECHNIQUES:
The following are actual scanned images of a UPC-A barcode (without man-
readable or guard bars for clarity). These tests were produced on white coated
corrugated. These are pictured here to help the user understand some of the
important parameters in producing a reliable barcode. The faint background
noise is a result of the scanning process and is not indicative of a typical printed
sample.
Barcode with:
Bar width = 5
Added space = 0
Decodability = 39%
Average bar = 16X
Code class = C
Barcode with:
Bar width = 5
Added space = 1
Decodability = 50%
Average bar = .11X
Code class = B
Barcode with:
Bar width = 5
Added space = 2
Decodability = 62%
Average bar = .03X
Code class = A
Barcode with:
Bar width = 6
Added space = 0
Decodability = 47%
Average bar = .17 X
Code class = C
Barcode with:
Bar width = 6
Added space = 1
Decodability = 51%
Average bar = .10 X
Code class = B
Barcode with:
Bar width = 6
Added space = 2
Decodability = 64%
Average bar = .00 X
Code class = A
Notice the diminished
size ratio of the narrow
light bar versus the
narrow dark bar
Adding 2 spaces
makes the narrow light
bar equal to the
narrow dark bar
The narrow light bar is
still slightly less than
the dark bar
Notice the diminished
size ratio of the narrow
light bar versus the
narrow dark bar
The narrow light bar is
still slightly less than
the dark bar
Adding 2 spaces
makes the narrow light
bar equal to the
narrow dark bar
Barcode reader/verifier test equipment QUICK CHECK 800
All barcodes were readable and acceptable, some better than others
Decodability is the percentage as compared to the verifiers standard
Average bar is the size difference of a light bar to a dark bar
Code class is the overall acce
p
tance of the code A B C D F