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Avoiding Seams On High-Resolution Multi-Projector Displays using An Un-calibrated Camera

Report ID:
May 2000
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A scalable, high-resolution display may be constructed by tiling many projected
images over a single display surface. One fundamental challenge for such a display
is to avoid visible seams due to both misalignment and variations in color
balance among the projectors. Traditional methods for avoiding seams involve
sophisticated mechanical devices and expensive CRT projectors, coupled with
extensive human effort for fine-tuning the projectors. This paper describes
three methods that facilitate seamless imaging on a multi-projector display: automatic
alignment, automatic color balance, and optical blending. These methods rely on an
inexpensive, uncalibrated camera to measure the relative mismatches between
neighboring projectors, and then correct the projected imagery to avoid seams
without significant human effort.

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