108Views2Replies

Author Options:

How would i make a lens for a projector so that when i shot i at a wall at an angle? Answered

It is as wide up and down. 
I dont know how ells to describe it.?

2 Replies

user
orksecurity (author)2011-03-20

This is known as "keystoning". Serious cameras used for taking pictures of architecture and things like that use lenses that can be shifted offcenter to correct for parallax ; something similar ought to work in a projector.

https://secure.wikimedia.org/wikipedia/en/wiki/View_camera#Movements

Video projectors generally solve this in the electronics instead, by distorting the image to compensate... cheaper, but loses some resolution.

Select as Best AnswerUndo Best Answer

user
seandogue (author)2011-03-20

Well, one way is to introduce the reverse error when shining the projector on a mirror to project to the wall.

Select as Best AnswerUndo Best Answer