面向大尺度战场的地貌晕渲增强方法  

Method of Enhancing Relief Shading for Large-scale Battlefield

作　　者：孙胜哲 李辉 SUN Sheng-Zhe;LI Hui(College of Computer Science(College of Software Engineering),Sichuan University,Chengdu 610065,China;National Key Laboratory of Fundamental Science on Synthetic Vision,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学计算机学院(软件学院),成都610065 [2]四川大学视觉合成图形图像技术国家级重点实验室,成都610065

出　　处：《计算机系统应用》2023年第5期11-19,共9页Computer Systems & Applications

基　　金：国家自然科学基金重点项目(U20A20161)。

摘　　要：地貌晕渲是大尺度战场仿真中的重要一环,针对现有的地貌晕渲技术在细节处纹理特征不明显的问题,提出了一种结合高程曲率和环境光遮蔽的大尺度战场地貌晕渲增强方法.第1步,通过分析数字高程数据的曲率属性生成地形曲率图,曲率图与卫星影像叠加可以突出显示地貌特征线.第2步,提出一种基于深度可分离卷积的环境光遮蔽计算方法,能够增强战场地形在沟壑处的视觉表现.最后将曲率图、环境光遮蔽与卫星影像三者融合生成实时地貌晕渲效果.实验表明,本文方法可以在较低级别的全球卫星影像上呈现更好的视觉效果,使得观察者在把握三维地形整体走势的同时,能进一步分析地貌细节处的纹理特征.Relief shading is an important part of large-scale battlefield simulation.Aiming at the problem that texture features of the existing relief shading technologies are not obvious in terms of details,this study proposes a large-scale battlefield relief shading enhancement method that combines elevation curvature and ambient occlusion.In the first step,by analyzing the curvature attribute of digital elevation data,a terrain curvature map is generated and then superimposed with satellite images to highlight geomorphic feature lines.In the second step,an ambient occlusion calculation method based on depthwise separable convolution is proposed,which can enhance the visual performance of battlefield terrain in gullies.Finally,the curvature map,ambient occlusion,and satellite images are fused to generate a real-time relief shading effect.Experiments show that the proposed method can present better visual effects on low-level global satellite images so that the observer can further analyze the texture features in terms of terrain details while grasping the overall trend of the three-dimensional terrain.

关 键 词：战场仿真 地貌晕渲 平面曲率 环境光遮蔽 深度可分离卷积 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] E91[自动化与计算机技术—计算机科学与技术]