問題介紹:app
slam構建地圖,先進行降採樣,再進行可視化或存儲。然而通過降採樣後,代碼沒有報錯的狀況下,點雲數據散成一團。將代碼和點雲數據展現以下,spa
pcl::VoxelGrid<Lidar::PointType> voxel_filter; voxel_filter.setLeafSize(0.02, 0.02, 0.02); Lidar::PointCloudPtr mapPointCloud(new Lidar::PointCloudType); //濾波器輸入變量 //... //往輸入變量中填充數據 //... voxel_filter.setInputCloud(mapPointCloud); voxel_filter.filter(*mapPointCloud); std::cout << "after voxel_filter, mapPointCloud size : " << mapPointCloud->points.size() << std::endl; std::string index = std::to_string(ndtCount); pcl::io::savePCDFileASCII ("/home/gordon/fase_ws/src/ddd_wall_mapping/filter_map_"+index+".pcd", *mapPointCloud);
問題分析:指針
猜測是因爲降採樣濾波器的輸入和輸出是同一個指針變量,在處理過程當中內存混亂,致使點雲數據出錯。code
解決方案:blog
使用兩個不一樣的變量做爲降採樣濾波器的輸入和輸出,而且做爲輸出的變量每次都要進行清空操做。內存
問題解決後的代碼和點雲數據展現以下,string
pcl::VoxelGrid<Lidar::PointType> voxel_filter; voxel_filter.setLeafSize(0.02, 0.02, 0.02); Lidar::PointCloudPtr mapPointCloud(new Lidar::PointCloudType); //濾波器輸入變量 //... //往輸入變量中填充數據 //... Lidar::PointCloudPtr filter_mapPointCloud(new Lidar::PointCloudType); // 濾波器輸出變量 voxel_filter.setInputCloud(mapPointCloud); voxel_filter.filter(*filter_mapPointCloud); mapPointCloud->clear(); *mapPointCloud += *filter_mapPointCloud; std::cout << "after voxel_filter, mapPointCloud size : " << mapPointCloud->points.size() << std::endl; std::string index = std::to_string(ndtCount); pcl::io::savePCDFileASCII ("/home/gordon/fase_ws/src/ddd_wall_mapping/filter_map_"+index+".pcd", *mapPointCloud);
至於具體緣由,至今不詳,忘高手或前輩指點迷津。 io