User's Manual

DT-018581 Reader User Guide
© 3M 2008 All rights reserved.
15
Reading 2D Barcodes
Because of their detail, 2D barcodes are most often printed at a high resolution. Many factors
may affect the ability of a software application to accurately decode the barcode’s information
from a scanned image. These include:
• low resolution, poor, faded or fuzzy printing is potentially problematic
• undersized or skewed bar codes cannot be reliably read
• large feature size (bar density) may reduce legibility
• insufficient contrast between print and paper may cause inaccurate reads
• interaction of the ink and paper may result in image bleeding or blurring over time
• laminates that affect image clarity reduce readability
The high resolution capability of the 3M™ AT9000 Full Page Readers makes them ideally suited
to capture and decode the detailed features of 2D barcodes. However, due to the document
variability, 3M cannot guarantee that its readers will be able to read every PDF 417 barcode. For
some documents, the use of a specialized, hand-held 2D bar code reader may be the most reliable
option for reading 2D barcodes.
Identification Cards
Identification cards typically have a photo and basic information on the front and a 3-line MRZ
on the back.
Figure 19: Sample Identification Card (Back)
Passports
Machine Readable
Zone (MRZ)
1D Barcode