Centering - Honeywell 4820HDHM User Manual

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
Delay, page 4-12, 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.
Barcode 1
Barcode 2
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.
0
40%
60%
100%
If a barcode is not within the predefined window, it will not be decoded or output
by the image scanner. If centering is turned on by scanning Centering On, the
image scanner only reads codes that intersect the centering window you specify
using the Top, Bottom, Left, or Right barcodes.
40%
To
Botto
Left
Right
60%
Default
Center
Aimer
100%
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