1. It can be applied to a theoretically unlimited amount of 
images. 
2. The search space is constrained through the image 
geometries. 
3. A method of shaping the patches to model the effects of 
camera orientation was described. 
4. The search can accommodate (sometimes large) 
unmodelled shaping parameters of the search patches, 
caused by varying surface height. 
5. The search steps within the search images can be 
controlled. 
  
  
Figure 4. The propeller and control frame. 
The MIC approach is significantly more robust and reliable than 
standard stereo-correlation algorithms due to the increased 
redundancy and geometric constraints. The technique is well 
suited not only for automated surfacing but also for interactive 
measurements providing specific object measurements such as 3- 
D coordinates, distances or volumes. The user only needs to 
identify the point of interest in a single image to obtain its 3-D 
coordinates. The MIC algorithm can be used for locating the 
point in all the other images with a high degree of reliability and 
efficiency. 
  
Figure 5. The plastic lid with projected grid. 
  
  
  
  
  
  
  
  
  
  
Surface RMS 
o, (pels) o, (pels) 0, (mm) o, (mm) 0; (mm) 
Propeller 0.05 0.05 0.04 0.04 0.17 
Plastic Lid 0.03 0.04 0.03 0.03 0.14 
  
  
Table 1. Results from the MPGC matching of both surfaces. 
  
REFERENCES 
Baltsavias, E.P., 1991. Multiphoto Geometrically Constrained 
Matching, Dissertation No. 9561, ETH Zurich. 
Beyer, Horst A., 1992b.Geometric and Radiometric Analysis of 
a CCD-Camera Based Photogrammetric Close-Range System, 
Dissertation No. 9701, ETH Zurich. 
Claus, Michael, 1984. Digital Terrain Models Through Digital 
Stereo Correlation, Photogrammetria, 39, pp.183-192. 
Dowman, I.J., 1984. Problems and Some Solutions in Digital 
Correlation for Photogrammetric Profiling, Photogrammetria, 
39, pp.155-167. 
Forstner, W. and E. Gulch, 1987. A Fast Operator for 
Detection and Precise Location of Distinct Points, Corners and 
Centres of Circular Features, Proceedings: of the 
Intercommission Conference on Fast Processing of 
Photogrammetric Data, Interlaken, Switzerland, June 2 - 4, 
1987, pp. 281 - 305. 
Van der Vlugt, Graeme, 1995. Algorithms and Design Aspects 
of an Automated Vision Based 3-D Surface Measurement 
System, Unpublished PhD Thesis, University of Cape Town. 
504 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B5. Vienna 1996 
Vollmer 
Matchin 
Intercon 
Photogr: 
pp. 273 
Fig