I stood in the bathroom, my long mirror behind me with great excitement i took it and look myself in the eyes i noticed how my eyesight was exactly trimmed to the viewing distance i am used to, which is the distance to my computer screen. I then twisted and turned the mirror and i noticed how much it expanded my field of view (FOV).

Then it snapped in my brain what if this technique would be used with a camera system to expand its FOV or even create Stereo Imaging. My first Idea was a system where the mirror would spin around the camera. And while it spins the camera has a track of the mirrors position because the mirror is controlled by a servo. So OpenCV could select the mirror percisly to put its image in the right context, that was the idea in my head atleast I had no clue of OpenCV back then.

flat mirror
flat mirror Top-down 2D camera viewing paths reflected by a flat mirror sweeping plus or minus 30 degrees. The center normal remains radial. Light travels in the reverse direction. Rays returning into the camera are blocked.
convex mirror
convex mirror Top-down 2D camera viewing paths reflected by a convex mirror sweeping plus or minus 30 degrees. The center normal remains radial. Light travels in the reverse direction. Rays returning into the camera are blocked.

2D viewing paths traced outward from the camera; light travels in reverse.

So this was the idea i had in my head, so lets plan the next steps. First we going to look at solutions of other people. A paper on Stereoscopy [1] expanded my idea into areas i haven’t taken in account yet modelling 3D was also a good option and also led to an idea to combine the movement of a vehicle the camera is attached to with Image Processing to create a 3D image instead with mirrors, but lets stick to the mirror idea first.

The plan is pretty clear, use a camera fix a mirror to motor with a contraption that the motor is right below the camera, but holds the piece in a distance to the camera. So now iam gonna destroy one of the mirrors inside my room to have a workable piece, with right size for the contraption.

The result i suspect is that i can create a extended image/ spatial image through this technique think a panoramic shot with gaps.

references

  1. Nene & Nayar. Stereo with mirrors (1998). ↩