OpenGL成像机理及其与摄影测量方位元素的相关分析

Relating OpenGL Imaging Process with Exterior and Interior Parameters of Photogrammetry

从射影几何的角度深入分析了OpenGL成像机理 ,并且分析了OpenGL与摄影测量相关的内外方位元素的表达。推导出了两种成像过程的转换公式 ,并建立了一套用摄影测量方法构造OpenGL透视成像矩阵的公式。实验验证了摄影测量学中共线方程与OpenGL的透视成像机理的一致性。

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.