ons are already 
'! object coordi- 
| forward inter- 
linates (fig.6) is 
the image pro- 
ogrammetrische 
. 
correlated. The 
s performed by 
rs to determine 
step is the 
ther by bundle 
points 
296 
  
fig.4: CCD-camera 
As a result we receive spatial (X,Y,Z-) coordinates of 
the measured shape of the face and the plaster cast. 
For further analysis the data files are transferred to 
CAD-programs (Computer-Aided-Design). 
After running the PHAUST module some hundred 
points are available to be linked up within regular sur- 
face meshes in AutoCAD or Microstation. With that 
any interpolation of points is possible depending on 
the demanded accuracy. For example a cubic B-spline 
is used in AutoCAD to interpolate 3D polylines and 
meshes. Special applications allow the assessment of 
post-therapeutical changes of all points on the mea- 
sured faces. 
tdi ey 
  
fig.ba: measurement image 
Lists of coordinates or graphic analyses are available. 
In other words: photogrammetric measurement of 
patients at two or more points in time allow a nume- 
rical and / or graphic overlay and comparison of the 
shapes. The derivation of views from any possible 
perspective, transversal and lateral sections as well 
as the calculation of angles, distances, shapes or 
volumes now allow the objective evidence of the 
consequences for soft tissue after skeletal surgery 
treatment. The following figures 5a and 5b show 
details of the frontal measurement image with a 
projected point grid and the appropiate image points. 
In the background of the picture some retroreflecting 
targets of the calibration frame are visible. 
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International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B5. Vienna 1996