i 
344 
To solve the problem, we designed and built 
the first original holographic measuring de- 
vice (Figure 1). Atthe end of 1969, our stand- 
ard error of pointing was, for the three direc- 
tions, 0.02 mm for X, 0.03 mm for Y, and 0.11 
mm for depth. These results were presented 
at the first International Symposium of 
Holography held in Besançon, France, in 
July 19701. 
At the end of 1970, our research was satis- 
factorily completed and we were able to an- 
swer Mrs. M. Marquet. This was done by 
giving figures for the six different relative 
orientation elements of the hologram with 
respect to its divergent reference beam? 3. 
In September 1970, at the Symposium of 
the LS.P. Commission V on moving object 
photogrammetry, we pointed out4 the great 
advantages of hologrammetry for high-speed 
motion problems. 
In 1972, at the XIIth International Con- 
gress of Photogrammetry, I displayed a new 
hologrammetric measuring device for high- 
precision measurements®. With the attach- 
ment being mounted on a Wild A7 (Figure 2) 
I obtained better standard errors, i.e.: 0.008 
mm forX,0.013 mm forY, and 0.070 mm forZ. 
In October 1972, at the ACSM-ASP Con- 
vention at Columbus, I presented a paper 
entitled “Numeric Relative Orientation in 
Hologrammetry,"$ in which I proposed a 
Fic. 2. Hologrammetric attachment for the Wild 
AT. 
PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING, 1976 
mathematical method for repositioning 
holograms by means of error deformation 
measurements. 
At the 1973 ASP-ACSM Convention in 
Washington, I participated in a group discus- 
sion dealing with close-range photogram- 
metry?. My principal contribution was to 
pointoutthe need fora commercial version of 
an hologrammetric apparatus, not specially 
for photogrammetrists, but to help all holo- 
gram users interested in holographic meas- 
urement. People are not making holographic 
measurements because they simply do not 
know that such measurements are possible. I 
am still convinced that, even with rough 
measurements (0.1 to 0.2 mm accuracy), great 
improvement could be made in interferomet- 
ric holography. This could be done by 
measuring not on the image object but on the 
interferometric fringes in order to determine 
their location, their form, and the exact space 
between two consecutive fringes. 
As far as the near future is concerned, we 
are working on a project to automatically 
generate contour lines onto conventional 
stereomodels. We intend to use first, pairs of 
terrestrial photographs of a three- 
dimensional model and then, if successful, to 
apply the same methods using aerial 
stereomodels. We hope to be able to report 
favorably on the progress of our research at 
the time of the congress. 
REFERENCES 
. Agnard, J. P., Brandenberger, A. J., and Boivin, 
A., "Obtention de pointés stéréoscopiques de 
précision dans l'image holographique virtu- 
elle: Hologrammétrie." International Sympo- 
sium on Holographic Applications, Besancon 
France, July 1970. 
2. Agnard, J. P., Hologrammétrie, Tolérance de 
l'orientation relative des hologrammes pour 
fins de mesures. Master's thesis Laval Univer- 
sity, December 1970. 
. Agnard, J. P., Brandenberger, A. J., and Boivin, 
A., "Tolerances in holography." Photogram- 
metric Engineering, 38-1, pp. 51-53, January 
1972. 
. Agnard, J. P., “Hologrammétrie des objets en 
mouvements ultra-rapides." Symposium of 
the ISP Commission V on Moving Objects 
Photogrammetry Paris, September 1970. 
5. Agnard, J. P., “Hologrammétrie de haute pré- 
cision.” Commission V. XII ISP Congress, 
Ottawa, August 1972. 
5. Agnard, J. P., “Numeric Relative Orientation 
in Hologrammetry.” ACSM-ASP Fall Techni- 
cal Convention, Columbus, October 1972. 
. Agnard, J. P., “Holography, a new concept to 
solve close-range photogrammetric prob- 
lems.” ASP-ACSM Convention, Washington, 
March 1973.