* Many projectors are used to project the virtual world.
* At least some information must be known about their parameters and relative geometry such as:
o Internal parameters.
o Relative position and orientation.
o Color calibration.
* In our case, we have developped an original approach (see scientific references below) based on:
o No full calibration of the devices. We use a panoramic (catadioptric) camera to get correspondances between each projector pixel with the camera pixel. This camera represents the viewpoint of our futur observers. Then, from what the observer should see, we can build the projector images from their respective mapping.
o No 3D reconstruction of the screen.
- Tardif, J.-P., Roy S., Trudeau M., Multi-projectors for arbitrary surfaces without explicit calibration nor reconstruction, The 4th International Conference on 3-D Digital Imaging and Modeling (3DIM'2003), pp. 217-224, 2003. Pdf.