These methods can be divided into two types . one is the methods based on the ray - tracing technique , such as monte - carlo method , zone method , discrete transfer method ; the other is methods based on the discretization of radiative transfer equation , such as discrete ordinate method , finite volume method , finite element method and so on 目前辐射传递问题的求解方法可分为两类,一类是以射线踪迹为基础的方法,如蒙特卡洛法、离散传递法、区域法等;另一类是基于辐射传递方程离散的方法,如离散坐标法、有限体积法、有限单元法等。
The new ideas of this dissertation mainly lie in two points . based on the research on the traditional edge tracing techniques , this dissertation presents an improved method according to lml rule . at the same time , studying the polygonal approximation methods , this dissertation also presents an improved and based on mergence method to image contour , and implements the transform of the contour from image to graphics preferably 本文的主要创新点在于:在研究传统轮廓跟踪技术? ? “爬虫”法的基础上,提出了基于lml规则的改进的轮廓跟踪方法;同时,研究了多边形拟合法,提出了基于聚合的改进的多边形拟合物体图象轮廓线方法,较好地实现了对边缘轮廓线的从图象到图形的转换。