put control points on the fundus of the 
dummy model of eye. Also adjustment or 
detection for camera calibration is impossible 
because of the crystalline lens power is 
different on each patient, and the focus must 
be adjusted each time. 
On fourth, eye fundus surface is 
covered by retina and blood veins. And the 
  
  
    
  
  
  
  
  
  
  
  
  
  
  
  
n 
retina is half transparency and 
expressionless pattern, therefore possibility 
for mismatching is high. Even in case the 
system decided matching success, the system 
dose not know which stratum of fundus is 
matched. 
This paper mentions solutions for 
All the first and second problems, and introduce Fig - 2 Stereo photo of fundus 
of the developed system. Also this paper 
So mentions present solutions for the third and 
forth problems. 3. Principle 
1), The bundle of ray reflected from 
m ocular fundus by flush light of a fundus 
19 2. Glaucoma camera makes a spatial image by focusing 
gh The cause of glaucoma disease is through convex lens of the fundus camera. 
not clearly known. The symptoms are This spatial image is relayed to a film surface 
progresses slowly, and disease are continue through lenses after the convex lens as stereo 
without feeling pain, and finally the viewing (fig - 2). Getting DEM of fundus from 
glaucoma will lose eyesight from the patient. the stereo images on the film is divided two 
The statistic shows that 3 % of 40 systems as below. 
: years and elder are suffered by glaucoma, 1) À ocular fundus to a spatial image 
MIS and it is highest cause of blind. 2) A spatial image to a film surface 
of First, at system of 2) on the basis of 
nif photogrammetry principle, height of spatial 
. image is taken by parallax of stereo image. 
Ire mm And a fundus height is taken by multiplying 
in Crystalline |! : . . 
E magnification of system of 1) to the spatial 
tor Light axis | usb axis image height. 
be E The system prepares a CCD camera 
nd upon the film surface where fundus images 
s are focusing. Also a normal camera can be set 
3s on the same position. In this case, developed 
ie Fig-1 Fundus films are scanned to digital images by a film 
n scanner which included in the system. 
ine 
fie Objective pi ine Rr Coherence 
ora Eye Lens Photographing Relay Lenses Prism 
eS À | Spatial | | 
is \ | | 
ds : : 3 
for 
era | dt 
del | 
ind pis E 
use Aprture 
all. Stereo Base Film Surface 
"10 
Fig - 3 Photographing optical system of the fundus camera 
559 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B5. Vienna 1996