Vinten Radamec Free-d - Manual (Page 23)

Vinten Broadcast Ltd free - d ™ Installation Manual V1.4.4
Page 23 of 46
If the reported distance and the actual distance differ by more than about 1
part in 500 (10 mm in 5 metres) suspect that one or both of the first two
‘reference’ targets has an incorrect X- and/or Y-value. Correct the fault before
proceeding.
7.4 Height and camera Z-offset
With the studio camera mounted on a pedestal, and with the tilt locked at
zero, measure the actual camera height above the studio floor (to the
appropriate reference point, which is usually the optical axis of the studio
camera’s lens). Compare the measured height with that reported by the
free-
d ™ system.
If the reported height and the actual height differ by more than about 10 mm
suspect either that the three ‘reference’ targets have incorrect Z-values, or that
the camera’s Z-offset value is incorrect. The Z-offset value must be measured
from the white spot on the side of the upward-looking camera (below the
free-
d ™ logo) to the reference point on the studio camera. If the free-d ™ camera is
above the reference point the offset should be negative.
7.5 Camera X-offset
With the studio camera mounted on a locked pedestal or tripod, and with the
tilt locked at zero, pan the camera so that the reported pan angle is zero (the
camera is then looking along the positive Y-axis). Note the X-position
reported by the
free-d ™ system. Now rotate the pan by 180 degrees, so that
the camera is looking along the negative Y-axis. The reported X-position
should be no more than 5mm different from that previously measured.
If the X-position changes significantly when the pan is changed from 0º to
180º, either the optical axis is not directly above the pan axis of the camera
head (in which case this test is not useful) or the X-offset value is incorrect.
The subsequent tests require free-d ™ to be connected to a virtual-set
system, with the ability to view a composite picture consisting of the
output from the studio camera keyed over a virtual background.