Bar-Coded Boarding Passes (BCBP) Implementation guide - IATA

StB Bar Coded Boarding Pass Implementation Guide
5.7.2. Scanning performance
The reading distance (between reader and bar code) and the scanning area (length-width) of a
scanner are related. A smaller distance, or range, provides a better resolution. The example
below (see fig. 46), based on Intermec 1470B, demonstrates that relationship.
80mm.
60mm.
26mm.
35mm.
30mm.
40mm.
Figure 48 - Scanning range and resolution courtesy of Intermec
At a scanning distance of 60mm for example (see fig. 47), a scanner has a window of 40x30mm.
If the scanning distance is doubled to 130mm, the window is 73x55mm, which enables to scan a
bar code physically larger. However there is a trade-off. Scanners can read bar codes within a
certain distance depending on the resolution. For example a scanner can read a bar code (at any
resolution) at a minimum distance of 40mm. If the resolution of the bar code is 0.125, the bar
code can be read in the distance range between 40mm and 70mm. If the bar width is bigger, for
example 0.33, the bar code will be physically bigger but can also be read from a larger range,
between 40 and 130mm.
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