"t 
d 
JO 
EE 
is 
vO 
id 
11 
le 
2B ol-BtuLocdcoousunnofm MO 0 | 
9 W 93 (Q^« "$5 £7 
  
  
  
  
  
  
  
  
  
Beam 
rM 
splitter 
[E Br T ru ee e cus 3 
| | A 
| | 
| | [7171 
| | 
| Test plate | 
| 
Beam | ] | e 
expander | | A 
Ne Pas fii al 
S 
Collimator 
lens V V E 
R 
Hologram Mirror 
Observer 
Fig, 5 
Computation 
It is evident that an interacting relation must be maintained between the 
development of the optical and measurement techniques of this application of 
close range photogrammetry and the computational developments needed to 
ensure a full realisation of the information recorded via an optimally 
efficient operation for data reduction. We are fortunate in having the 
cooperation with University College London and with Stuart Granshaw, and in 
the availability of exceptional computational facilities in the Division of 
Information Technology and Computing at NPL. A scheme for developing this 
interaction has been devised to serve our internal needs, with the intention 
that it could be made more widely available when completed. 
The program being developed is a variation of the self-calibration bundle 
solution developed by Granshaw, but specifically adapted to our needs. 
Conclusions 
This paper has described how the involvement of NPL in three-dimensional 
measurement for engineering purposes has led to an interest in close range 
photogrammetry, and the consequent studies of the potential of the technique, 
193