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Figure 5: First registration point at start of calibration process
The user is required to touch and hold their finger at the intersection of the crosshair
until the touch is registered and stored in memory. A green crosshair will appear at the
point where the user first touches the screen as shown in Figure 3. This is the current
location of the registered touch and should not be confused with the target. Do not try
to drag this green crosshair onto the registration point.
The user should then move their finger so that it is directly over the registration point
and hold it in place for about 4 seconds. The duration in which the point is held is shown
as a sweeping grey circle in Figure 4. When the entire circle goes from dark grey to light
grey, the initial target will be replaced by a green crosshair showing that the new touch
point has been registered. This is shown in Figure 5. If a user removes their finger
before this occurs then they must restart the process for that particular registration
point.
After the first touch point has been registered, the process repeats itself with a
registration point appearing in the top right corner, then the bottom right corner, and
finally the bottom left corner. When the entire process is complete, the screen should
look similar to the screenshot shown in Figure 6.
If the calibration process has been performed correctly then the touchscreen should
now be ready for use. Users should not see a significant difference between the location
of their finger or stylus, and the pointer that is shown on the screen. If the gap is more
than a few millimeters apart then repeat the calibration process.
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© NEC Corporation 2016
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