Elo
provides a standard calibration utility for video alignment. The CALIBRATION
is used to convert touches from the Elo coordinate system to Windows virtual
coordinate system.
The
driver uses the following equation to convert a raw touch coordinate point from
Elo coordinate system to the Windows screen coordinate system.
Calibration
equation is
Xcal
= a + m*Xuncal,
where,
Xuncal,
is in Elo coordinate system
Xcal,
is in Windows coordinate system
m
= nScrDx / nEloDx
"a",
is the X offset value entry
nScrDx
= distance between targets in Windows virtual coordinates
nEloDx
= distance between targets in Elo coordinates.
This
is specially useful if you want to save the calibration over the network or
in some other place, and later configure the touchscreen using one common data
set.
To
get the current calibration data from driver use EloGetCalibrationData, for
changing the data use EloSetCalibrationData
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