Relating OpenGL Imaging Process with Exterior and Interior Parameters of Photogrammetry

This paper focuses on bridging the imaging architecture of OpenGL and photogrammetry analytic theory. Firstly, the imaging mechanism of OpenGL has been analysed in the light of projective geometry, and the relationship between exterior and interior parameters in photogrammetry and image matrix in OpenGL has been summarized. Then, the transition equations of two imaging processes are inferred, and a set of equations that conform the perspective imaging matrix are built. By the experiment of simulation of real camera imaging process in OpenGL, the consistency of collinear equation in photogrammetry and perspective imaging mechanism in OpenGL is validated, which will pave the way for the usage of OpenGL. In this experiment, a CCD camera has been used. Firstly, several images of a industry part have been taken by this camera. Then the exterior and interior parameters of these images have been calibrated and these parameters have been input into our OpenGL program to produce corresponding imaging matrix. The experimental results show the reliability and correctness of derivation.