120 
CONCLUSION 
In this paper some ofthe direct optical con- 
touring methods are evaluated with regard to 
their performance characteristics. At the out- 
set optical contouring schemes seem to offer 
major advantages in close-range applications; 
however, care must be taken in assessing the 
metric accuracy of the contours generated. 
Optical contouring systems provide a power- 
ful means of obtaining quick but qualitative 
information of close-range objects. The prob- 
lems associated with data reduction repre- 
sent the major roadblock to the widespread 
use of their potential. 
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