DEFINITIONS OF PERSPECTIVE DIMINUTION FACTOR AND FORESHORTENING FACTOR : A PPLICATIONS IN THE ANALYSIS OF PERSPECTIVE DISTORTION ——————————————————————————————————————————————-————
Hongyu Guo · 2013
There has been considerable confusion about the terms perspective diminution and foreshortening in the literature. Foreshortening factor has been defined and investigated in computer graphics literature, but only for the case of parallel projections. The case for perspective projection does not appear to have been investigated. In this paper, these concepts are elucidated through rigorous quantitative definitions of the perspective diminution factor and foreshortening factor. The inverse law and inverse square law that govern the perspective diminution factor and the perspective foreshortening factor in relation to depth were investigated and applied to a quantitative analysis of perspective distortion.