Operator`s manual

Manual # 26-0206000-00 / Revision A BlendPRO – Wide Screen Image Processor 33
4. Detailed Examples and Calculations of BlendPRO Parameters
The BlendWizard is designed to guide users through the process of defining a system configuration and setting up
the system to provide optimal results. We realize that some users will want to understand in detail how the internal
calculations are performed in the Wizard. Reviewing the details is a good way to make sure that you fully understand
the image processing techniques. If you want the details, read on, however, most users can simply skip this section
of the manual.
BlendWizard Calculations
The basic calculations performed by BlendWizard to derive output image parameters are described below. A typical
example is used to help illustrate the input provided by the user as well as the output derived from the BlendWizard
program.
Output Image Size and Aspect Ratio
Generally the first parameters entered by a user are the size of the desired wide screen output image. The operator
typically enters the vertical size and horizontal size of the output image. The aspect ratio of the output image is
automatically calculated. For this example we will assume:
- the wide screen image must fill a 30x10 foot screen and
- the resolution of the projectors is 1280x1024.
The calculations proceed as follows.
Output Aspect Ratio = Horizontal Size/Vertical Size
Example: Output Aspect Ratio = 30 feet/10 feet = 3.0
Note: The operator can also enter the vertical or horizontal size and a desired aspect ratio to derive the size of the
screen in the other dimension.
Projector Native Resolution
The operator next must indicate the native resolution of the projectors that will be used. Typical choices include:
640x480 (4:3 aspect ratio), 800x600 (4:3 aspect ratio), 1024x768 (4:3 aspect ratio) or 1280x1024 (5:4 aspect ratio).
The BlendWizard calculates the number of projectors required to fill the output screen.
The number of horizontal output pixels viewed on the wide screen image is:
Number of Horiz Pixels Viewed on the Output Image = Proj V Res x Output Aspect Ratio
Example: Number of Horiz Pixels Viewed on the Output Image = 1024x3.0 = 3072
where: Proj V Res = Projector Vertical Resolution, in pixels
The minimum numbers of projectors that can be used is:
Minimum # of Proj = # of Horiz Pixels Viewed on the Output Image/Proj H Res
Example: Minimum # of Proj = 3072/1280 = 2.4 This number must be rounded up to the next higher integer, 3 in this
case. Some of the “extra” input resolution is required to accommodate overlap regions.
The number of projected horizontal pixels required to form the output image is:
# of Projected Horz Pixels = # of Horz Pixels Viewed on Output Image + ((# of Proj - 1) x Overlap)
where:# of Proj = Number of Projectors
Overlap = Amount of Projector Overlap, in pixels