7.5.5 Extending DOF Using Standard Acquisition Group (Cycle All In
Same Phase)
Multiple Image Acquisition Settings assigned to the same Acquisition Group (Standard), can
be configured and enabled 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 (see 15 mil
reading diagram). 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
Alternative Acquisition Groups (Input Select) feature described in par. 7.5.6.
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 VisiSet™ Standard Setup Wizard to set the different acquisitions
settings.
NOTE: By default the Alternative Acquisition Group Select parameter is
disabled.
Multi Image Acquisition Settings Procedure using Standard Setup Wizard:
1. Using the Standard Setup Wizard set the first acquisition setting (default) for the 195 mm
Reading Distance. Save the setting to Permanent Memory.
2. Through the Calibration Tool (Interactive Mode):
a. Set Calibration>Image Acquisition Setting 1 - Status to Disabled
b. Set Calibration>Image Acquisition Setting 2 - Status to Enabled
c. Set LEDs And Keypad>Autolearning Setup>Image Acquisition Setting to 2
d. Close the Calibration Tool
3. Using the Standard Setup Wizard set the second acquisition setting for the 300 mm
Reading Distance. Save the setting to Permanent Memory.
4. Through the Calibration Tool (Interactive Mode):
a. Set Calibration>Image Acquisition Setting 1 and 2 - Status to Enabled
b. Verify that the reader decodes at both distances then Close the Calibration Tool
c. Send Configuration to Permanent Memory
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