Piste) 
  
  
  
  
  
  
  
(c) Serna regions(L) 
  
  
(d) Segmented egions (R) 
  
  
  
  
  
  
  
  
  
  
  
  
  
eA e ==> À M ut A 
A MEN Y 
i = Crd s 7) 
Rem a rs à m TL) 
Tar Pl Le : 
Co ei Fines. ea 
A 
HO Ca M = 
WR DR RES 
— R3 IU A «a ca & - 
€ em £s ize d 
Um vA ura V bes. 
m Qu ; zs e 
_— a 
(g) 3D regions above (h) 3D regions above (1) House extracted from (j) House extracted from 
the ground (L) the ground (R) 
region-lines pairs(L) region-lines pairs(R) 
  
  
  
  
  
  
  
  
  
  
  
  
  
(k) 3D lines above the ground(L) (1) 3D lines above the ground(R) (m) A map data 
Fig.4. Experimental results of house extraction(L--left, R--right). (a) and (b) are the original images involving a lot of 
buildings, roads, and a few trees as well as cars. (c) and (d) present the totally segmented regions from the left and right 
images, respectively. (e) and (f) show the 3D lines which lie on the ground surface. (g) and (h) illustrate the house 
hypotheses extracted from 3D regions, i.e., these 3D regions which lie above the ground. (i) and (j) show the house 
hypotheses extracted from region-lines pairs which are located above the ground. (k) and (1) are the 3D lines above the 
ground. (m) is the map data at the experimental area in which two houses with X sign were unable to be detected in this 
experiment. 
785 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B4. Vienna 1996