vds 69871-01 Operation & Maintenance Manual Download Page 58

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Marquee ACON Ultra Installation/Operation Guide

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2.3.6

Memorization

Once the

Calibration

operation is successful, the system is ready to memorize the current geometry

of the projector.  Two sets of data are acquired during memorization.  The first is the set of electronic
settings which establish the projector’s existing geometry and convergence information.  The second
set of information is the measured values of all the Test Points.  When the Geometry correction
algorithm routines are needed to perform corrections, this initial, memorized set of test point
observations is compared against the current sampled set of observations to calculate an error for
each valid test point.  These error calculations are used to calculate two different pieces of
information: the desired amount of change for geometry (center as well as screen), and the priority
of the particular geometry.  Thus, the

Rule Base

of a particular geometry may calculate that a large

change is needed; however, a different geometry with a smaller change may be determined to have
higher priority. The geometry change with the highest priority will get implemented first. In the
Center and the Screen passes of the Geometry correction algorithm, a single projector geometry is
changed at a time. In the Edge pass of the Geometry correction algorithm, multiple changes may be
made in a single pass.

During the

Memorization

process,

compiles statistical information from repeated measurements

of the same test point.  When the memorization operation is complete, if the results are
questionable, a notepad is opened displaying a text document with each warning message.  This
information may indicate that there are still some insufficiencies within the calibration of the test
points.  These warnings are treated in the FMEA style diagnostic worksheet (VDC D/N 79041-01).
The document is organized as a chart with failure modes followed by possible effects and possible
corrective actions.  Work through this chart to identify what, if any, corrective action is required to
facilitate a successful memorization.

2.3.7

Correction Operations

After

has been calibrated and memorized, it can be used to correct for small amounts of drift in

the projector’s convergence and memorized geometry. Select the group of channels (projectors) that
will perform the operation and then select the operation to perform. The

software will first initialize

the camera of each channel selected, then attempt to identify the presented test pattern. If the
correct test pattern is present,

continues with the correction operation. If the correct test pattern

is not present, the channel’s projector displays a warning message and the

status window

displays a message signaling that it is waiting for the correct test pattern. If

initially fails to identify

the test pattern, it cycles through the other CRTs of the projector to attempt to eliminate issues
caused by the CRT glare seen on the rear of the facet. Once the test pattern has been identified by

, the requested correction operation continues. Both the Geometry and Convergence correction

operations provide feedback through the GUI’s status window. Messages from a channel have the ID
of the associated projector attached for ease of association.

The

Geometry

Correction

operation performs three different testing passes; the first testing pass

corrects the projector’s static positioning as well as the linearity of the projection. The second pass of

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