vds MARQUEE ACON Ultra Camera Kit, Operation & Maintenance Manual

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Marquee ACON Ultra Installation/Operation Guide
2-30 AU User Controls, Settings and Operation
The number of test points chosen for the Screen Geometry test point set affects several operational
characteristics. If the number of test points is insufficient, the Calibration routines will not have
enough information to be able to recognize some or all of the projector geometries to be corrected.
After completion of the calibration routine,
AU will issue any warnings concerning invalid geometry
models. If these warnings are presented, test points may be insufficient in number or placement. On
the other hand,
AU can only make one geometry correction after testing ALL of the points in the set.
Therefore, extra test points in the set may unnecessarily prolong the completion of the Geometry
Correction operation. Typically, 20-25 test points have been sufficient to trace all edges of the screen
and provide complete information for the correction algorithms. The Screen Geometry test point set
can have a maximum of 50 test points. The “Add” and “Remove” buttons on the
Screen Geometry
Maintenance Window
allow the user to add or remove test points to the end of the test point set.
2.3.4.3.2 Using the Script Editor (the short method)
The Screen Geometry Script Editor allows the user to quickly establish most of the test points needed
for a complete Screen Geometry test point set. From a separate dialog window, all of the corners of
the screen are identified. Each corner is identified with a valid test point intersection that is closest to
the corner. After the entire screen is outlined by these test point intersections, the
Initial TP: Screen
routines extrapolate a specified number of test points between each corner. For example, a
rectangular shaped screen would have its four corners matched with a test point intersection in the
corners, and the user selects to add 3 more test points per edge. After the
Initial TP: Screen routines
complete, a total of 16 test points would be in the set – one for each corner then three more for each
of the four edges.
This method operates in a very quick and reliable way and provides a fairly good estimate of test
point positions. However, if the screen contains some irregularities (e.g. a cockpit cutout) the
Screen
Geometry Maintenance Window
may still have to be visited to reposition the effected test points
outside the irregularity.
2.3.4.4 The Convergence Test Point set
Both Convergence Correction and the third Geometry pass use the Convergence test point set.
Typically, the test pattern that is used for these correction passes has a denser grid pattern than that
used for the Screen and Center Passes. When the Geometry algorithms use this test point set, static
and dynamic green convergence are used to align the points of the image compared to the
memorized intersection locations. When geometry is using these points for correction, it has already
performed as much geometry correction as it can with the screen-wide Geometry and Picture
settings. When the Convergence algorithms use this test point set, static and dynamic convergence
are used again, however it is the red and the blue CRTs that are being aligned to the green raster.
The Marquee projector has 45 convergence control points (9 columns of 5 rows). If the projection
facet covers the entire raster, then all 45 of the projector’s convergence zones will require an active
test point. If the facet shape occludes some of the convergence
zones, then some test points may be marked “
Unused
”; it is
important to check carefully before disabling a test point to make sure
the zone truly has no effect on the facet. Even if the actual control
point falls off of the facet, it still may affect the visible portion of the
raster. If the convergence zone is outside the facet shape but still
affects a facet area, one must choose an intersection on the effected
area. The process of establishing the convergence test point set
involves finding, on the facet, the area of maximum control – as
indicated by the area of maximum misconvergence.
The Convergence Maintenance Dialog provides a mechanism to do this. When checked, the checkbox
entitled “ Show Misconvergence ” introduces a set amount of misconvergence into the projector (This
misconvergence is removed when the dialog leaves the selected test point). While this