Calibrate horizontal extent using color

[wenzeslaus]

Tangible Landscape can now automatically calibrate vertical extent based on a empty, flat table/surface and horizontal extent based on a model. It should be able to calibrate the horizontal extent also based color only. It seems reasonable that the system would project a picture and than find that picture on the table in the same way it finds the model. User specifies the extent by placing and extending the map window.