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Liang-Chien Chen 
  
  
(a) 
  
   
  
(b) 
Fig.6 Comparison of Traditional Window Matching and CLR Matcher 
(a) Single Window, (b) CLR Windows 
3 EXPERIMENTAL RESULTS 
The experiment includes the testing of the proposed scheme for building detection from a pair of color aerial 
image pairs. Test images were scanned from a pair of aerial photos with a scale of 1 to 9800. Scanning at 22.5 |um 
pixel spacing, the pixel coverage in the object space is about 20 cm. The images of the test area are shown in fig. 7. 
The result of segmentation using region growing for the left image is shown in fig. 8. Fig. 9 shows the building 
blocks manually selected from the segmented regions. This is considering the semi-automatic approach and is the 
only manual input in the whole process. Fig. 10 is an edge strength map. The results of detected building corners 
are illustrated in fig. 11. In which, a partial enlargement is shown in fig. 11 (b). Finally, the detected buildings are 
shown in fig. 12. 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000. 173