Microscan MS-Q Imager Manual de usuario Pagina 112

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Set Targeting Zone Tolerances
Save changes whenever you reconfigure Imager settings.
9-6 COPYRIGHT © 2005 MICROSCAN SYSTEMS
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Settings
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all Data
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to USB
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Rules
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to PS2
Set Targeting Zone Tolerances
Targeting Zone Tolerance is particularly useful in environments where closely spaced
symbols of various sizes need to be precisely targeted.
It allows the Imager to effectively narrow the field-of-view relative to the size of a
symbol and thus determine how close your target spot can be to a symbol and still be
a candidate for decoding.
It does this by counting the number of pixels
across a symbol and comparing that with
the distance (in pixels) the target spot is
from the edge of the symbol (x 2). The
exact formula is shown in the diagram to the
right.
For example, a target tolerance of 100% would
require the target spot to be no more than half
the dimension (width or height) of the symbol.
So for a symbol that is 100 pixels across, the
target spot must be within 50 pixels on either
side. A 100 pixel symbol with a 50% tolerance
must be within 25 pixels on either side of the
symbol.
The symbols presented below represent a range of tolerances, the 50 setting being the
most precise (least tolerant) and the 1600 symbol being the most tolerant. If you set
the unit to a 50% tolerance, you will need to aim the targeting spot directly on the
desired symbol for it to be read.
Read one of the following symbols to set the decode accuracy of the MS-Q Imager.
Unlimited (Default) 50% 75% 100%
125% 150% 200% 400%
Symbol
Target spot
Distance
from
target
spot
Symbol
width
Targeting zone tolerance =
2 * distance from target spot /symbol width
(or height) * 100
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