nbul 2004 
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B5. Istanbul 2004 
  
  
  
1+ 
| 
r 
0 E 
0 20 
— — d rete eiat ier patte ttt 
| 
i? ] 5 ^ 
| i 
2 
— 
| 
! 
| 
| 
l^ 
% 20 
   
  
40 7 60 80 ^. 100 
  
pieles eed 0 
  
  
  
  
  
  
  
  
  
Figure 5. (a), (b), (c), (d) Correlation between slope variation and gray 
for real image 
  
  
  
a E 
  
  
  
  
40 60 80 100 
tao ta 
40 we 80 100 
  
  
(d) 
shade variation