MATRIX 300N™ REFERENCE MANUAL
7.2.6 Extending DOF Using Internal Image Settings Selection
(Cycle All In Same Phase) for Liquid Lens Models
For Liquid Lens models, multiple Image Acquisition Settings can be configured and enabled
internally through the application software to extend the reader's depth of field. During each
reading phase, decoding will be attempted by applying each enabled Image Acquisition
Setting (cyclically).
Example:
Read a 15 mil Data Matrix ECC 200 code covering a range from 140 to 320 mm. The reading
distance range is too long to be covered by a single acquisition setting, so two acquisition
settings could be used in which the first has a Reading Distance of 195 mm and the second
has a Reading Distance of 300 mm. When both are enabled, the reader cycles through the
two settings effectively producing the extended DOF.
NOTE: Cycling through Image Acquisition Settings that require changing the
Reading Distance parameter (for liquid lens models), drastically reduces the
frame rate due to the liquid lens refocusing delay as well as by the number of
settings simultaneously enabled. Therefore this may not be the best solution
for high speed applications. For high speed applications it is best to use the
External Image Settings Selection (Input Select) feature described in par. 0.
Otherwise use multiple readers set to different reading distances.
Since many factors and parameters contribute to maximizing the reading process, it is
suggested to use the DL.CODE Image Auto-Setup and Focus Autolearn tools to set the
different acquisitions settings.
NOTE: By default the Image Settings Selection parameter is set to Internal.
Multi Image Acquisition Settings Procedure using Internal Image Settings Selection:
1. Using the DL.CODE Image Auto-Setup and Focus Autolearn tools, set the first
acquisition setting (default) for the 195 mm Reading Distance. Then Save on Device.
2. Add another Image Setting, and using the DL.CODE Image Auto-Setup and Focus
Autolearn tools, set the second acquisition setting for the 300 mm Reading Distance.
Then Save on Device.
3. On the Reading Phase step > General Settings > Acquisition Settings, set the Image
Settings Selection to Internal (default). Then Save on Device.
4. Verify that the reader decodes at both distances with the DL.CODE Monitor.
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