vds MARQUEE ACON Ultra Camera Kit Operation & Maintenance Manual Download

Page: 54 / 93

Marquee ACON Ultra Installation/Operation Guide

2-31

misconvergence is visible, use the

Motor Control Tab

to reposition the camera location until the

center intersection shows the most misconvergence. In the corresponding picture, a blue circle is
shown around the intersection that should be positioned at the center of the image.

NOTE:

When

Show Misconvergence

is checked, the displayed image does not automatically update.

At any time, the displayed image may be updated with a single click on the

Picture Tab

NOTE:

When setting the location of a test point, the green intersection should be the one centered in
the

Picture Tab

. It is sometimes difficult to distinguish the misconverged color line with the

green lines. Clicking the

Apply

button on the

Basic Motor Tab

will temporarily remove the

induced misconvergence allowing the truen location of the green intersection to be viewed.

NOTE:

If it is difficult to choose which is best between a number of intersections, any would work
with approximately equal efficiency.

2.3.5 Calibration

Once the locations of the test points in all sets are finalized,

needs to perform a calibration

operation to finalize a series of relationships. The calibration process is used to build relationships
between the projector and the specific test point or test point set being calibrated. While

allows

the option of calibrating all three sets of test points in one operation, it is advisable to perform the
convergence calibration first, and then perform calibration on the Screen and Center Geometry test
point sets.

When performing Convergence calibration, at most three projectors in an installation should be
chosen at a time. Part of the calibration process involves moving the

and

Drive

settings of the

projector through the entire available range. If too many projectors are doing this at once, the
ambient light levels skew the calibration results to the lower end of the available range; giving less
than optimum results. Geometry calibration can be performed safely on all projectors in the
installation.

2.3.5.1

Visibility Settings and Automated Gain Control calibration

With the

camera set to the location of the current test point, a group of projector and camera

settings is calibrated to provide the best image quality for the

ACON Ultra

measurement tools. This

automated Gain Control (AGC) is performed in all of the calibration operations – Convergence,
Center Geometry, and Screen Geometry.

All test points must have the image quality (visibility) settings optimized to allow the

correction

routines to perform at the highest level. The correction routines support a range of image quality
settings and the optimum setting places the test point’s image quality at the top of this range. The
visibility settings include projector

contrast

brightness

and

drive

settings as well as camera

offset

and camera

gain

settings.

The

Vision Control Tab

is present on all of the Maintenance Dialogs. This tab provides part of the

interface necessary to manually prepare the test point for the AGC operation.  The AGC operation
can be configured to find the best settings for any of the image quality settings; however, the more
parameters the AGC search has to cover the longer it takes to complete.  Typically, only three or four
of the parameters are needed to obtain optimum levels.  The user will manually select levels for all
parameters not covered in the AGC search.  Better performance has been observed if the CRTs are
driven to as low a level as possible; therefore it is suggested to position the Camera

gain

at the

maximum level (100%) and the Camera

offset

at mid range (50%).

If manual setting is desired, the range of control allowed with the projector

contrast

parameter is much