International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B3. Istanbul 2004 
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Figure 4. Morphological reconstruction 
2.3 Implementation and Results (g) (h) 
The methodology is applied to pan-sharpened IKONOS images 
of a rural area of Kish /sland (Persian Gulf) and an urban area 
of Rasht (a city in northern Iran) as demonstrated in figures 5 
and 6 respectively. Each figure consists of (a) the original 
image, (b) the fuzzy classified image, (c) segmented image, (d) 
result of trivial opening on segmented image, (e) initially 
identified road surface, (f) result of opening operation, (g 
applying second trivial opening to remove narrow paths, (h) 
effect of closing to fill the small gaps, (i) extracted road center 
line, and (j) final extracted road centerline which is 
superimposed on the original image. Please note that there are 
extreme radiometric variations on the road surface of the Rasht 
city image and also its road sides. These variations have 
affected the result of the classification extremely. Meanwhile racicä d l : des which. 
the result of the morphology process seems to be more ARE au centerme HES ach os 
E superimposed on the original image 
satisfactory. 
  
(i) t rose) 
Figure 5. (g) applying second trivial opening, (h) effect of 
closing, (i) extracted road center line, and (j) 
    
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(e) (f) (e) 
Figure 5. Road extraction from pan-sharpened IKONOS image Figure 6. 
of a rural area of Kish island: (a) original image, (b) > 
fuzzy classified image, (c) segmented image, (d) 
result of trivial opening, (e) initially identified road 
surface, (f) result of opening operation 
Road extraction from pa-sharpened IKONOS image 
of a rural area of Kish island: (a) original image, (b) 
fuzzy classified image, (c) segmented image, (d) 
result of trivial opening, (e) initially identified road 
surface, (f) result of opening operation 
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