HandHeld Entertainment 4600r - Manual (Page 61)

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The default centering window is a 128x96 pixel area in the center of the
imager’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
imager’s field of view, which is 640 by 480 pixels.
If a barcode is not within the predefined window, it will not be decoded or output
by the imager. If centering is turned on by scanning
Centering On , the imager
only reads codes that intersect the centering window you specify using the Top ,
Bottom , Left , or Right barcodes.
Barcode 1
Barcode 2
0
100%
100%
Default
Center
40% 60%
40%
60%
Left
Right
Bottom
Top