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Never read more than a single bar code per scan! Some product labels are
composed of two bar codes, where the first bar codes identifies the product and
the “supplemental” bar code specifies the retail price. When a single image con-
tains two bar codes, the widest bar code gets read and the secondary is ignored,
as the example below illustrates.
GOOD READING OF BAD IMAGES
You will soon experience, that, as much as you might want to, it is very diffi-
cult to scan with a perfectly steady hand. So, the obvious question arises whether
this undermines the accuracy of the bar code reading.
It doesn’t! Evidently, bar code reading with the IRISPen has its limits - these
are discussed below - and one cannot expect the same flexibility from the IRISPen
that is typical of bar code laser scanners. The IRISPen is a bar code reader for
the office environment, not for industrial applications.
Nevertheless, it is important to stress how tolerant the IRISPen is with images
of bad quality. As bands of about 0.4" (1 cm.) are scanned, the IRISPen is more
flexible than other bar code reading pens. Even when your scanning generates
skewed, wavy and distorted images, the proprietary PBR technology is able to
correctly read the bar codes! You do not have to position the pen scanner with
great precision to read bar codes correctly.
5chapter4.p65 2/16/2001, 3:26 PM8