A thought occurred to me that it would be nice to build a little webcam type thing onto a whiteboard. I recently became aware that Ultra-Short Throw video projectors, which are able to project a 254cm (100") diagonal image from only about 8cm (3") away are a thing that exists.
My question is: What sort of lenses come to mind to do the opposite? That is, take a rectangular surface that is very close and accurately capture it, with minimal distortion.
3 Comments
anguo@lemmy.ca · 6 pts · 1y
I would imagine it would be the exact same lens & mirror setup. Light goes both ways.
colourlesspony@pawb.social · 2 pts · 1y
I think you can just use a wide angle lens and convex mirror to get the same effect. Like a rear view car mirror or security mirror. I found image on google showing how it works.
nickwitha_k@lemmy.sdf.org · 2 pts · 1y
Awesome! Thank you! I'll have to think on this for a bit and see if I can figure out a way to use some of my spare parts to test.