z 
-l 
L-yYy 
0n=0 
— 
(T(m,n) = Ty : 
i 
It is well known its two parts are more similar 
with increasing this coefficient. 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
N N 
Imagel ImageT 
Center (x1,y) Center (x2,y) 
Left image Right image 
Parallax = x2—x1 
Fig. 1 The principle of correlation matching 
  
Right image 
Fig.2 (a) Input images 
  
    
Fig.2 (b) True image 
  
Correlation window size 11 
Fig.2 (c) Resultant images using different 
correlation window sizes 
In Fig.1, ^N" is the correlation window size. In the 
correlation analysis method, as the correlation 
window size is larger, remarkable error points 
decrease. However, the information of height data 
becomes rough as shown in Fig.2. 
To extract precision height data, therefore, we set 
24 International Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998 
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