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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B5. Istanbul 2004 
Top of Figure 14 shows the initial projections in 2 images of 4 
arcs and 4 lines connected to each other. The length of shorter 
line segments is about 12 pixels in image, and a few pixels for 
arcs. They are very difficult to reconstruct with common 
strategies. But for the proposed technique of object space 
solution with geometric constraints, they can be reconstructed 
easily and stably. The projection of reconstructed model is also 
well fitted to images (bottom of Figure 14). 
  
  
Figure 13. Initial (top) and reconstructed (bottom) projections 
of a circle 
  
  
Figure 14. Initial (top) and reconstructed (bottom) projections 
of connected arcs and lines 
5. CONCLUSIONS 
An effective approach for 3D reconstruction and measurement of 
industrial parts mainly composed of line segments, circles, 
connected arcs and lines with non-metric image sequence and 
CAD-designed data is proposed. Wire frame model of industrial 
695 
part can be accurately reconstructed with hybrid point-line 
photogrammetry. Circles, arcs and lines connected to each other 
are reconstructed by one-dimensional point template matching 
and direct object solution with known camera parameters from 
hybrid adjustment. 
Experiments of real images are very satisfying. The relative 
precision is higher than 1/8000, and all imprecision larger than 
0.1mm can be detected accurately. The proposed reconstruction 
and measurement technique also has the advantages of low cost 
of hardware and fully automatic. It shows a promising potential 
in automatic 3D reconstruction and measurement of industrial 
parts mainly composed of lines, circles, connected arcs and lines. 
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