Cöltekin, Arzu 
  
different viewpoints. This way, the correct geometry is determined and a more practical approach to make the 3-D 
models has been gained. The only data used is videography. 
To supply coordinate reference, a common datum is determined, that its origin in this case is the corners of a room. All 
the objects in the room have their own coordinate system, relating the common datum. Only if a need occurs to relate 
this with a geographic coordinate system, then the geodetic control points become necessary. 
Data and Implementation 
Data is collected using the Sony Camcorder TR-780-E Hi-8 CCD video camera, with auto-focus and a fixed zoom in 5 
second shots. Images are stored in 30-minute videotapes and grabbed by using IRSS (Interactive Resource Sharing 
System) which is an internal implementation of the institute. 
The base software was Sense8’s WorldToolkit and the C code developed on their libraries (Mattila, 1997). Images are 
transferred into .tga format to be able to process by World-Toolkit. 
a] 
  
  
hj 
  
  
  
  
  
di 
  
  
  
  
  
Figure 1. The graphical relative orientation of an image and the room model. The change of viewpoint is shown on the 
left and the results on the right: a) a video image presented as a background and the movable room model on it: b) the 
viewpoint of the model changed so that the scale corresponds the one of the image; c) the viewpoint of the model 
changed until the locations in X and Z are the right ones; d) the orientation specified by the w— and y— 
rotations. 
(The image above is taken from Haggrén et al. 1997) 
  
144 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B5. Amsterdam 2000. 
  
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