METHOD FOR DETERMINATION OF FOCAL LENGTH OF DIGITAL NON-METRIC SHOOTING CAMERA

摘要

A method for the determination of focal distance of a digital non-metric shooting camera relates to short-basis stereophotogrammetric method in different fields of science and engineering: testing hydro-technical constructions on models, investigation of deformations of units and mechanisms, medicine, etc. According to the invention, one carries out mapping of control and measuring grid. On a goniometer one additionally installs a mirror with possibility of deflection of the control and measuring grid to objective of the camera. Values of focal distance are calculated by coordinates of crosses of the control and measuring grid and horizontal and vertical angles measured between the directions to the central and other crosses. The control and measuring grid is installed from the objective of the digital non-metric shooting camera at fixed distances that are not located for the objective in infinity. By the values of coordinates and horizontal and vertical angles one determines equivalent focal distance. By the values obtained one makes conclusion on real focal distance of digital non-metric shooting camera. The technical result is in increase of accuracy of coordinates of points of the test objects.