4 
nated and single-illuminated parts of the photographic 
papers were measured with a planimeter. 
Fig.5 shows an exposed photographic paper. The 
double-illuminated areas are black, the single-illumina- 
ted ones are grey. The model-forest was placed on point 
C8 and is supposed to be photographed with an wide-angle 
camera, 60 % end overlap. 
  
  
  
  
  
  
  
  
  
  
  
V o ALA