Abstract
This paper proposes a fast and approximate solution of camera calibration for image synthesis. We present three types of the approximation for perspective imaging, and compare their performances to that of the exact solution by exact perspective model. The proposed techniques reduce the processing time drastically. This is because, while the exact solution must employ biquadratic equations, by using approximations to perspective, a fast solution with quadratic equations was constructed for real time image synthesis. This technique allows some amount of errors by the approximation, but it is shown to be tolerant for practical use.
