vds 69871-01 Operation & Maintenance Manual Download Page 48

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Marquee ACON Ultra Installation/Operation Guide

2-25

NOTE:

The initial projector Alignment is accomplished in the methods detailed under the
installation’s standard operating procedures. If a customized method is unavailable, a guide
to setting up projector geometry is contained within the projector’s user manual.

Additionally, it is important that the

camera is suitably mounted and cables appropriately

connected to allow communication with each of the projectors and each of the cameras in the
complete system. Ensure that the instructions from Chapter 1 have been properly followed and that
the hardware is properly installed and connected to the

Server before proceeding to the initial

setup and calibration of the

system.

There are two (2) test patterns used for the

functions: the geometry and the convergence test

patterns. The geometry test pattern is used by

to establish the projectors’ basic horizontal and

vertical size and shape. The convergence test pattern is used by

to perform a more precise

arrangement of all three colors. The database used to generate the test patterns should be present
and accessible before attempting to perform

initial setup and calibration.

2.3.3

Primary Relationships

The Primary Relationships build basic physical relationships between the

camera and the

Projection Facet. These relationships include:

1. Grid densities of the different test patterns used by

2. Motor step to camera pixel conversion factors
3. Motor location for the center of the projected raster

The

software only allows modification of these Primary relationships through the

Auto Setup

operation. While establishing the Grid intensities for the test patterns, the user will be requested to
change the image generator (IG) pattern to the pattern that is being learned.

ACON Ultra

performs its Geometry and Convergence correction operations against the location of

an intersection of a projected grid pattern. For Geometry, the corrections compare the location of
the grid intersection presented during memorization with the currently sampled location of the grid
intersection. For Convergence, the correction compares the location of the intersection of the
Green CRT with the location of the corresponding intersection of the Red and Blue CRT.

Geometry Test Pattern

Convergence Test Pattern

The

software limits the amount of distortion (geometric or convergence) capable of being

corrected to one-half the distance between two lines of the test pattern’s grid (maximum observable
distortion is also limited by the field-of-view of the

ACON Ultra

camera). A sparser test pattern

allows for a larger maximum limit of observable distortion, but provides for fewer test points (so the
resolution of the corrections may become limited). While a denser test pattern allows a higher
resolution of correction, but limits the maximum observable distortion. Thus, the spacing of the test
pattern should be selected to allow for a maximum amount of observable distortion, while providing
enough correction resolution to be able to have test points at all points of the screen that can be