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SuperVisor LX
SECTION 4
FGAX3249400MANAA
100701
Version 1 Issue 2
4.24
Calibration
When in keying operation, the active area of the
output signal is defined by the active area of the
input VGA signal. Prior to calibration, there will be
a discrepancy between the size and position of the
VGA active area and the size and position of the
video active area. The purpose of calibration is to
make the active area of the video signal exactly fit
into the active area of the VGA signal.
Calibration is best done before any attempt is
made to resize the video signal. That is to say with
Pan, Tilt, Horizontal Size and Vertical Size all set to
their default values. It may be necessary to view
the output on a computer monitor for this purpose.
There are two methods of calibration available –
manual and auto. Either method may be used or a
combination of both.
Manual calibration requires the adjustment of four
controls. Top and Left to adjust the start of the
video active area; Height and Width to adjust the
height and width of the video active area.
If auto-calibration is used, the Supervisor LX will
determine the active area of the VGA signal and
then automatically reposition and resize the video
active area by setting calculated values for Top,
Left, Height and Width. It is important to know that
the accuracy of auto-calibration depends upon the
picture content of the VGA signal at the time of
calibration. The best picture is a full screen of pure
white. A very good alternative is to start Notepad
and maximize the window. Avoid pictures with
large areas of black in them, especially at the
edges of the picture.
Note 1: in some cases it may be found that
adjusting the Size controls (Pan, Tilt, Horizontal
Size and Vertical Size) can achieve the same
effect as calibration. Depending on the application,
this may be a practical alternative to using the
calibrate controls. It is not, however, the
recommended method.