The compensation principle is to reduce the gap of the plate 
observations, [ r r, ] — 0. The matrix is diagonal in shape and 
its resolution goes through the RNM (Reduced Normal Matrix 
[10]. Concerning the external data, a condition equation on the 
distances reduced to the scale of the plate. This fusion of 
photogrammetric precision and the potential of interpretation of 
the object characteristics is a new approach associating 
geometry and radiometry [11]. 
With the evolution of the photogrammetric systems with video 
images, combination with external data in the total treatment 
will allow a better mastery of space reference and a more 
precise assessment on the object [12]. 
Algorithm, figure (5) 
  
= To acquire perspective i and i+1; 
> Pre-treatments (x,y), («', y"), oblique; 
> DLT treatment - calculation of distortion — interpolation; 
> Storage of parameters (14) ; 
=> Repeat 1,2,3,4 until i+1 = NR beams 
=> Integration of other measurements (distances, co-ordinates, 
etc..) 
=> Adjustment of parameters (beams) - Rigorous method; 
— dimensional control. 
  
Sensor 
  
>) Computer 
  
  
  
  
  
  
  
  
    
Perenective | 
  
  
  
Treatments 
  
  
  
  
    
     
Perspective 2 
  
  
  
Perspective N 
  
  
Selection and capture of 
points 
  
  
  
Calculation of the 
re transformation parameters 
  
  
Calculation of residue, 
ES standard deviation , and 
verification 
  
  
Calculation of distortion 
  
  
Interpolation 
  
  
  
md 
  
Calculation of the new points 
  
  
Figure 5 - Software architecture 
4 - Application 
4-1- Test Object 
Our example concerns an experiment carried out in the National 
Center of Space Techniques (CNTS) on an industrial object (a 
Mazda pick up truck), figure (6)) The three-dimensional 
reference observations are carried out using an electronic 
tachymeter (ZEISS ELTA 46), and the snapshots using a simple 
camera (Minolta) with a 45 mm lens. Th overlap of the two 
beams was 8096. The calculation of the ground co-ordinates 
(object) and the three dimensional extraction includes all of the 
image observations of the points. The latter were carried out on 
a C100 ZEISS Planicomp comparator on the one hand, coupled 
with an on screen observation on the other hand. This double 
task was necessary to allow a comparison between the 
comparator system and the screen system. Indeed, the mastery 
of the determination of uncertainty is less obvious, especially 
when calculations of characteristics are concerned (evaluation 
of the propagation of errors) [13]. 
~114-