7system verification – Vinten Radamec Free-d User Manual

Page 22

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Vinten Broadcast Ltd

free

-

d

Installation Manual V1.4.4

Page 22 of 46

7

System verification

This chapter describes a set of tests to confirm that a

free-d

™ installation is

correctly set up. Some of the tests are performed on the camera tracking
system in isolation, and others on the tracking system in conjunction with the
associated Virtual Set system. The order of the tests has been chosen to
minimise the extent to which one test depends on the result of a later test, so
they should always be carried out in the specified sequence.

7.1

RMS error

Observe the RMS error reported by the

free-d

™ system (this can be displayed

on the CD3/563A by selecting position ‘2’ on rotary switch S5, and setting
toggle switch S3 ‘right’). The value displayed should be less than 0.10 for all
positions and orientations of the camera, although the value may momentarily
increase while the camera is moving.

If the indicated value is greater than or equal to 0.10, suspect that

the free-d

camera (particularly the focus) has been disturbed since it was calibrated, that
the camera ID number has been changed (causing the wrong calibration file to
be selected), that the appropriate camera calibration file has not been
uploaded, or that one or more of the targets has been disturbed since the
studio was calibrated.

7.2

Levelling

With the studio camera mounted on a pedestal, and with the pan and tilt
locked, observe the height (Z) value reported by the

free-d

™ system as the

camera is moved around on the (assumed horizontal) floor in the area below
the targets. Check that the reported height varies by no more than about 5
mm from place to place; this confirms that the XY plane is horizontal and that
the Z-axis is vertical. Ignore, for the time being, whether the reported height is
actually correct.

If there appears to be a consistent ‘slope’ in one direction, suspect that one or
more of the three ‘reference’ targets has an incorrect Z-value. The

free-d

software utility includes a ‘levelling’ facility to help correct this error
automatically.

7.3

Scale

With the studio camera mounted on a pedestal, and with the pan and tilt
locked, move the camera a known distance across the studio floor. Ensure
that the orientation of the camera does not change as it is being moved
(monitor the returned pan value if in doubt). Compare the distance travelled
with that reported by the

free-d

™ system.

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