单幅灰度图像在CAD建模中的应用  

CAD Modeling Based on Single Gray-scale Image

作　　者：梁发周[1] 马银平[2] 梁发云[3] 

机构地区：[1]南昌航空大学科技学院,江西南昌330034 [2]南昌航空大学自动化学院,江西南昌330063 [3]南昌大学机电学院,江西南昌330031

出　　处：《工程图学学报》2011年第2期60-63,共4页Journal of Engineering Graphics

基　　金：江西省教育厅重点科技资助项目(GJJ09012)

摘　　要：将基于shape from shading的三维表面重建算法应用于CAD。首先由实物表面成像模型建立基于朗伯反射模型的反射图方程;然后使用有限差分法将表面梯度离散近似,得到关于实物表面的函数方程式,利用Netwon-Raphson迭代方法求解,获得重建表面的高度函数值,重建结果符合产品模型数据转换标准,实现在CAD系统中交换;最后通过实物表面图像恢复三维表面形状,验证本算法和重建系统的可行性。A surface reconstruction algorithm in CAD is used on the basis of three-dimensional shape from shading.First,use the physical surface imaging model to create a reflection map equation based on Lambertian reflectance model;second,use the finite difference method to scatter approximation of the surface gradient to obtain the function equation of the physical surface;then find its solution by using of Netwon-Raphson iterative method to obtain the function value of the reconstructed surface height.the reconstruction results in line with product model data transferring standards and then the exchange in CAD system is realized.The image restoration through three-dimensional surface shape validates the feasibility of the algorithm and the reconstruction system.

关 键 词：从明暗恢复形状 计算机辅助设计 有限差分 朗伯体反射模型 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]