基于等灰度线的二次曲面快速成象算法  

AN ALGORITHM FOR FAST IMAGE GENERATION OF QUADRATIC SURFACES BASED ON EQUI-INTENTITY CURVES

作　　者：蔡志权[1] 杨东波[1] 潘士先[1] 

机构地区：[1]北京航空航天大学电子工程系

出　　处：《计算机辅助设计与图形学学报》1994年第2期106-111,共6页Journal of Computer-Aided Design & Computer Graphics

基　　金：国家自然科学基金

摘　　要：在对二次曲面的空间几何模型和光照模型分析的基础上，提出了基于等灰度线生成二次曲面的快速成象方法。给出了等灰度线的空间表达式。从理论上解决了实现快速算法的关键问题：１．等灰度线投影方程的确定方法，用近似方法获得速度与精度的良好折中，２．等灰度线投影的点生成算法。并对算法的效率及精度作了分析。A new method for fast image generation of quadratic surfaces based on equi-intensity curves is proposed on the basis of the geometric model and the shading model analysis. Equations of the equi-intensity curves are derived under the usual model of diffusive reflection and Phong 's model of specular-surface reflection. Two key problems are solved theoretically:1. how to compute the projective equations of the equi-intensity curves'.an approximation which yields good compromise between precision and efficiency is presented;2. how to calculate the coordinates of points on the equi-intensity curves. In addition, analysis for efficiency and precision of the algorithm is given.

关 键 词：等灰度线 二次曲面 成象算法 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]