机载激光雷达扫描三维地形的渲染研究  

Rendering algorithm of airborne lidar scanning 3D Terrain

作　　者：宫海晓 贺杰 杨秋慧 GONG Haixiao;HE Jie;YANG Qiuhui(Guangxi Colleges and Universities Key Laboratory of Image Processing and Intelligent Information System,School of Data Science&Software Engineering,Wuzhou University,Wuzhou Guangxi 543002,China)

机构地区：[1]梧州学院大数据与软件工程学院,广西高校图像处理与智能信息系统重点实验室,广西梧州543002

出　　处：《激光杂志》2021年第4期179-182,共4页Laser Journal

基　　金：国家自然科学基金资助项目(No.61961036);广西自然科学基金资助项目(No.2020JJA170007);广西高校中青年教师基础能力提升项目(No.2020KY17019,2017KY0629)。

摘　　要：针对三维地形渲染过程中容易受到气流干扰产生裂缝,导致渲染成像结果分辨率较低等问题,提出机载雷达扫描三维地形的渲染方法。通过机载激光雷达获取三维地形的图像数据,利用分形维数对图像进行纹理分割,获取图像的纹理与灰度的分布特征;利用网格逼近地形法构建LOD模型,剔除冗余数据;设置邻近地形的层级差,消除因分辨率等级不同产生的裂缝现象;利用Morphing平滑过渡方法,使顶点跳突现象消失;根据多级小波尺度分解方式对三维地形图像去噪实现三维地形的渲染。结果证明:本方法可有效改善三维地形的渲染效果,提高三维地形渲染成像的分辨率。In the process of 3 D terrain rendering,it is easy to generate cracks due to airflow interference,resulting in a low resolution of rendering results.This paper proposes a rendering algorithm of airborne radar scanning 3 D terrain.The image data of three-dimensional terrain is obtained by airborne lidar;the fractal dimension is used to segment the image texture and obtain the image texture and grey level’s distribution characteristics.The grid approach terrain method is used to build the LOD model and eliminate redundant data.The level difference of adjacent terrain is set to eliminate the cracks caused by different resolution levels.Using the morphing smooth transition method,the vertex jump disappears;according to the multi-level wavelet scale decomposition method,the 3 D terrain image is denoised to achieve the rendering of 3 D terrain.The experimental results show that this algorithm can effectively improve the rendering effect of 3 D terrain and the resolution of 3 D terrain rendering.

关 键 词：机载激光雷达 三维地形渲染 纹理分割 裂缝现象 小波尺度分解 

分 类 号：TN249[电子电信—物理电子学]