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BlendPRO – Wide Screen Image Processor
Manual # 26-0206000-00 / Revision A
Example: # of Projected Horz Pixels = 3072 + (2 x 256) = 3584
Note that in this case a default overlap of 256 pixels was assumed. The operator can adjust the overlap as required
to fit application requirements and the BlendWizard will automatically respond. If the # of Projected Horz Pixels
exceeds the number that can be handled with the minimum number of projectors the user will be prompted to
increase the number of projectors or decrease the overlap parameter. In this case, we have sufficient pixels (3x1280
= 3840) to project the 3584 pixels required to support three projectors with an overlap of 256 pixels.
Data Doubling
In order to create a seamless image on the output display, images from adjacent projectors must overlap and the
image data projected by each projector in the blend region must be identical. The two adjacent projectors must output
the same image onto the overlapped region. The input and output image displays on the BlendWizard screen
provide a graphical representation of the image processing that is performed to generate the display.
Figure 2-8
illustrates the screen contents that correspond to the example that we have been following here. In this example,
BlendPRO will receive input from a three head graphics processor running at 1280x1024 resolution. As indicated in
the Source View Window BlendPRO will process 3328 pixels of the available input to derive the output display. The
3328 pixels will be re-formatted to drive three projectors. Projector #1 will output the full 1280 pixels derived from
video source #1. In order to provide the same image content in the overlap area, Projector #2 must output the last
256 pixels of video source #1 as the first 256 pixels on the left side of it’s image. For this reason, 256 pixels from
video source #1 are then followed by the first 1024 pixels of the image from video source #2 to drive Projector 2
(source pixels 1024 through 2304). A similar process occurs for the third projector where the first 256 pixels of the
image projected by Projector #3 must correspond to the last 256 pixels on Projector 2 (source pixels 2048 through
2304). The remaining 1024 pixels in the output image are derived from source pixels 2305 pixels 3328. This data is
shown in the Destination View Window.
