基于射线管分裂方法的SAR场景快速消隐技术  

A Fast Hidden Surface Removal Approach for Complex SAR Scene Based on Adaptive Ray-tube Splitting Method

作　　者：董纯柱[1,2] 殷红成[1,2] 王超 

机构地区：[1]中国传媒大学信息工程学院,北京100024 [2]电磁散射重点实验室,北京100854

出　　处：《雷达学报（中英文）》2012年第4期436-440,共5页Journal of Radars

基　　金：国家部委基金资助课题

摘　　要：SAR场景模型常采用非均匀三角网格描述,使得传统的基于Z-Buffer技术的消隐算法难以在保持较高的消隐精度的同时兼顾消隐效率。该文提出了一种基于射线管分裂方法的SAR场景快速消隐技术,将复杂SAR场景的消隐问题分解为两个简单过程:一是对场景三角网格在发射平面上的投影点云做2维Delaunay三角网格划分,二是基于射线管分裂方法对新生网格可见性进行判断和拓扑重构。典型飞机目标和草地上T-72坦克的消隐结果验证了该方法的准确性和高效性。Traditional hidden surface removal algorithm based on hardware Z-Buffer technique cannot give attention to precision or efficiency at the same time when dealing with the non-uniform triangulated SAR （Synthetic Aperture Radar） scene model. A novel high-precision hidden surface removal approach using fast ray-tube splitting algorithm is proposed, where the SAR scene hidden surface removal problem is decomposed into two simple procedures, i.e. a Delaunay triangulator is used to generate the initial ray tubes from the projected point clouds of all incident visible vertices, then an adaptive ray-tube splitting method is adopted to carry out the complex scene shading situations and resultant visible model reconstruction. Simulation results of typical aircraft and T-72 tank show that, the new approach is feasible and effective.

关 键 词：消隐算法 射线管分裂方法 DELAUNAY三角剖分 Z-Buffer算法 SAR场景 

分 类 号：TN957[电子电信—信号与信息处理]