PRECISION PHOTOGRAMMETRY AT CLOSE RANGES WITH SIMPLE CAMERAS

Abstract

Photogrammetry at close ranges can be applied to solve a great number of interesting and important non-topographical problems. The author presents and illustrates a dozen examples taken from the fields of engineering and architecture, most of them involving work performed in his laboratory. In order to introduce modern photogrammetry to the engineer's working methods, it must, as far as possible, be made independent of the existence of surveying cameras. Three different, well-tried types of simple camera are illustrated. If precise and reliable results are desired, three requirements must be fulfilled: careful calibration of the camera, a sufficient number of control points and, as a rule, a medium-sized computer to enable a numerical treatment of the problems. Resume La photogrammetrie peut etre appliquee a la solution de maints problemes importants, non-topographiques. L'auteur donne une douzaine d'exemples tires du domaine d'application du genie et de l'architecture, la plupart concernant des travaux acheves dans son propre laboratoire. Pour que la photogrammetrie moderne soit utile aux ingenieurs il faut qu'elle soit independante des appareils photographiques specialises. L'auteur met en evidence trois appareils non-specialises deja utilises pour ses travaux. Pour assurer le succes de pareils travaux il faut avoir: (1) une chambre soigneusement etalonnee; (2) un reseau de points de control suffisament dense; (3) un ordinateur d'une capacitye moyenne.