Datalogic Matrix 120, Руководство по продукции

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MULTI IMAGE ACQUISITION SETTINGS
PRODUCT REFERENCE GUIDE 127
Automatic Image Settings Selection
If we don’t know from one item to the next which reading condition will be presented,
we will cycle through the pre-defined database of Image Settings (one per acquisition)
in order to automatically capture the correctly lighted image over the course of several
acquisitions. When the correct condition is matched, the result should be able to pro-
duce a Good Read.
When the Image Settings Selection is Automatic (default), then these Image Settings
groups will be used cyclically.
NOTE
If items to be read having the same lighting conditions are grouped together, then we
can improve the read rate through the
Start Acquisition From parameter. By choosing
the Last Successful value, we will start with the Image Setting that last produced a Good
Read. For this group of items the last Image Setting used will be correct for the next
item and so we start each cycle with the acquisition that will potentially produce a Good
Read.
Applications typically require more than one acquisition to obtain suffi-
cient Good Read percentages. This means that for
N acquisitions we will
surely have captured the correct lighting condition but we will also have
captured some acquisitions with the wrong lighting condition. A conse-
quence then is that we cannot run these types of applications at the
maximum speed because not all the acquisitions are useful to us. We
must wait for a sufficient number of acquisitions that will guarantee a
Good Read result.