Microscan MS-Q Imager Manual de usuario Pagina 125

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Advanced Operations
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Rules
MS-Q Imager User’s Manual 7-5
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
narrow the field of view
relative to the size of a
symbol, and to determine
the distance the
laser target must be from the symbol for a
decode event to occur.
This is accomplished by counting the number
of pixels across a symbol and comparing that
number with the distance (in pixels) of the
laser target 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 laser target spot to be no more
than half the dimension (width or height) of the candidate symbol. So, for a symbol that is
100 pixels across, the laser target spot would have to be within 50 pixels on either side. A
100-pixel symbol with a tolerance of 50 would have to be within 25 pixels on either side of
the symbol.
The configuration symbols below represent a range of tolerances, 50 being the most
precise (least tolerant) and 1600 being the least precise (most tolerant). If you set the
imager to 50% tolerance, you will need to aim the laser target so that the spot is directly
on the candidate symbol.
Read one of the symbols below to set the desired tolerance.
Targeting Zone Tolerance =
2 x distance from laser target spot / symbol
width (or height) x 100
Candidate
symbol
Symbol
width
Laser
target
spot
Distance of
laser target
spot from
symbol (in
pixels)
50
75
100 125
150
200
400 1600 (Default)
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