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2020/4820/4820 i User’s Guide
Centering
Use Centering to narrow the image scanner’s field of view to make sure the
image scanner reads only those barcodes intended by the user. For instance, if
multiple codes are placed closely together, centering will insure that only the
desired codes are read. (Centering can be used in conjunction with
Aimer
Delay
, page 4-11, for the most error-free operation in applications where multiple
codes are spaced closely together. Using the Aimer Delay and Centering
features, the image scanner can emulate the operation of older systems, such as
linear laser barcode image scanners.)
In the example below, the gray area is the full image scanner field of view and
the white area is the centering window. Barcode 1 will not be read, while
Barcode 2 will
be.
The default centering window is a 128x96 pixel area in the center of the image
scanner’s field of view. The following diagram illustrates the default top, bottom,
left, and right pixel positions, measured from the top and the left side of the image
scanner’s field of view, which is 640 by 480 pixels.
Barcode 1
Barcode 2
0
100%
100%
Default
Center
40%
60%
40%
60%
Left
Right
Bottom
Top
Summary of Contents for 2020
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