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Marquee ACON Ultra Installation/Operation Guide

2-34

AU User Controls, Settings and Operation

that allows a conversion from camera pixels, to convergence steps. This is done on a test point by
test point basis. If the automated

Convergence Calibration

routine has been completed and indicates

some inadequate results in test points, revisit those test points via the

Convergence Maintenance

Window

and adjust the settings. The automated Convergence calibration routine does not need to

be performed again. If a scale factor is insufficient, use the

Auto Scale

button. If the Visibility Settings

are insufficient, use the settings in the

Vision Control Tab

and the

Auto G2 and Drive

button to correct.

Use the

AGC

button to have

test the image quality of each of the pertinent colors. A test score

above 50% for all colors indicates acceptable settings. Higher scores are desirable. To further verify
the correct settings, press the

Run Convergence

button.

will try to run the Convergence correction

algorithms on the active test point. If success is indicated, the settings are satisfactory.

NOTE:

All the scaling factors for a convergence set point should have scale factor numbers with the
same sign.

NOTE:

Test points that display equivalent amounts of misconvergence in response to the

Show

Misconvergence

checkbox should have equivalent scale factor magnitudes.

2.3.5.3

Calibration of the Geometry relationships

An isolated test point means little when dealing the Center and Screen Geometry passes. The
corrections from both of these passes influence the entire screen; thus, one test point out of
alignment may not necessitate changes. The calibrated relationships here use an evaluation of the
entire set of test points; and – unlike

Convergence Calibration

– if changes are made to test points

after calibration, the automated calibration routine must be performed again.

NOTE:

If changes are made to Center and Screen Geometry test points after Calibration, the
automated calibration routine (the appropriate Setup > Calibration > Geometry menu is
chosen based on the test point set(s) altered) must be performed again.

To explain further, consider the

Skew

geometry adjustment. When

Vertical Skew

is changed, the

measured Screen Geometry test points should show little change in the horizontal reading and
positive or negative change in the vertical direction. The vertical change is proportional to the
direction of the

Skew

change and the vertical distance from the center. Note that direction is relevant.

The test points on one side of the center will move towards the left of the projector, the test points on
the other side of center will move towards the right of the projector. The waveform shown in this
figure shows the test point error readings measured on a facet after

Vertical skew

has been introduced.

In this waveform, there are 24 test points in the set. The first 24 measures are the horizontal
readings; the second 24 measures are the vertical measures.

During the second stage of the Geometry calibration (first stage is AGC calibration);

introduces a

known amount of distortion of the tested projector geometry. After measuring the entire test point set,
the generated waveform is stored as part of the calibration data. This waveform is used during the
calibration to configure and proportion an

Expert Knowledge Rule Base

. This

Rule Base,

along with

the generated set of waveforms – one waveform for each projector geometry –is used during further
correction operations to identify the correct projector geometry and to calculate the magnitude of the
necessary changes.

At the conclusion of the Calibration operation, any insufficient results are stored in a text file and
displayed in a separate notepad window.  Each projector with insufficient results generates a
separate file.  The contents of the text file describe the specific instances and the test points that may
require additional adjustment.  VDC document number 79041-01 FMEA worksheet includes, among
other items, all of the messages that may appear in this text file.  Associated with each of these setup
failure conditions, are suggested causes, and possible courses of action to correct the issues.