The Music of the Spheres surface is now ready. We are really enjoying it after all the hard work we have done. On below is a picture of our finished table.
Finished Music of the Spheres Table
Hardware Testings
After wood work shop weeks we have had lot of testings with camera, projector, mirroring and infrared light filtering. At the beginning of the project we were thinking only to use blob detection with our table top projection. Since the current concept requires individual tracking mechanism for each object on the surface our current set up with FTIR infrared lightning did not work with fiducials.
Frustrated Total Internal Reflection technique (FTIR)
In order to make suitable lighting environment for tracking we needed Diffused Illumination Infrared Technique. Breakthrough for us was to create our own infra red lights made of halogen lamps and using infra red filters for blocking all other light away. Camera was equipped with infrared filter as well. We used the following infrared filter. Note! can not be placed directly on the lamp because it is made of plastic.
Infrared cabin (in the base are two of them on opposite sides)
An other thing we found really important was to cover projection base in our system with white heat resistance paper – same kind of paper is used for shimmering and spreading direct shooting lights (used ex. in film productions). This method was right for us to achieve uniform light area on the surface where fiducials are placed. After these steps fiducials were easy to track with out any visible lighting problems.
Finally we would like to thank Merja Nieminen who set us on right track with infrared filters.
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