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post #1 of 2 Old 11-14-2015, 03:13 PM - Thread Starter
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Correcting skew

Hey all,
I've got a ceiling mounted projector currently projecting onto my wall. It works well enough for my needs. There is one thing that is bothering me about it - the projection has some overhanging bits - it's throwing up a parallelogram around the picture it displays. Look at the attached image.

I'd like to get rid of the overhang bits so that the result is just the image. Any suggestions?

Thanks!
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post #2 of 2 Old 11-14-2015, 07:30 PM
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Quote:
Originally Posted by PsychometricWanderer View Post
it's throwing up a parallelogram around the picture it displays. Look at the attached image.
To avoid geometric distortion, the projector needs to be perpendicular to the wall, both horizontally and vertically. The shape of the projected image (trapezoid, not parallelogram) shows that the projector is tilted upwards.
Tilt the projector download slightly should make bring the vertical sides parallel to each other. Then use the vertical lens shift to bring the image up to the screen, or similar mount the projector higher.
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