Operator`s manual

30 BlendPRO – Wide Screen Image Processor Manual # 26-0206000-00 / Revision A
Adjust projector Color Balance controls as required to match all projectors (Please refer to the operating
manual for the projector for detailed instructions).
STEP 4: Projector Registration (Overlap and Geometry Adjustment)
Set BlendPRO to output the Projector Alignment Test Pattern. This test pattern will automatically be tailored
to support the overlap specified for the edge blending regions.
Adjust the physical position of the projectors and the output size adjustments until the test patterns properly
align. (Please refer to projector documentation for instructions).
STEP 5: Output Black Level Adjustment for Non-Overlapped Region (DLP Projectors)
Set BlendPRO to output the following test pattern:
Black (0% Gray)
Despite the fact that BlendPRO is outputting black video to the projectors, you will notice that the projected
light intensity for the overlapped regions is greater than the intensity in the non-overlapped regions, resulting
in a vertical band. This is due to the fact that the overlapped regions are hit by the light “leakage” projected
from two projectors. BlendPRO provides adjustments to minimize this artifact as shown in the following
figures. You will also notice two narrow and dim vertical bands on each side of the overlapped region. These
bands are often called Sea-of-Mirror sidebands, or Halo by projectionists. The projected light intensity
without any adjustments is shown in Figure 2-5.
1 2 3 4 5 6 3 7 8
BLACK
FULL WHITE
A
1 - PROJECTOR 1 BLACK LEVEL REGION
2 - PROJECTOR 1 RIGHT HALO WIDTH
3 - PROJECTOR OVERLAP WIDTH
4 - PROJECTOR 2 LEFT HALO WIDTH
5 - PROJECTOR 2 BLACK LEVEL REGION
6 - PROJECTOR 2 RIGHT HALO
7 - PROJECTOR 3 LEFT HALO WIDTH
8 - PROJECTOR 3 BLACK LEVEL REGION
PROJECTED LIGHT
INTENSITY WITH
BLACK INPUT
Fig 2-5: Projected Light Intensity without Black level adjustments