PCL常见编程问题

转自:

https://blog.csdn.net/zhazhiqiang/article/details/52495872

 

针对大家在利用PCL开源进行开发过程中的常见问题,进行解答。本文会长期更新。
1.如何获取pcd文件点云里点的格式,比如是pcl::PointXYZ还是pcl::PointXYZRGB等类型?

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#include

#include

#include

#include

 

pcl::PCLPointCloud2 cloud;

pcl::PCDReader reader;

reader.readHeader("C:\fandisk.pcd", cloud);

for (int i = 0; i < cloud.fields.size(); i++)

{

    std::cout << cloud.fields[i].name;

}

2.如何实现类似pcl::PointCloud::Ptr和pcl::PointCloud的两个类相互转换?

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#include

#include

#include

 

pcl::PointCloud::Ptr cloudPointer(new pcl::PointCloud);

pcl::PointCloud cloud;

cloud = *cloudPointer;

cloudPointer = cloud.makeShared();

3.如何加快ASCII格式存储,也就是记事本打开可以看到坐标数据的pcd文件读取速度?
建议将pcd文件换成以Binary格式存储。

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#include

#include

#include

#include

 

pcl::PointCloud::Ptr cloud(new pcl::PointCloud);

pcl::io::loadPCDFile("C:\office3-after1.pcd", *cloud);

pcl::io::savePCDFileBinary("C:\office3-after21111.pcd", *cloud);

4.如何给pcl::PointXYZ类型的点云在显示时指定颜色?

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#include

#include

#include

#include

 

pcl::PointCloud::Ptr cloud(new pcl::PointCloud);

pcl::io::loadPCDFile("C:\office3-after21111.pcd", *cloud);

 

pcl::visualization::PCLVisualizer viewer("pointcloud viewer");

pcl::visualization::PointCloudColorHandlerCustom sig(cloud, 0, 234, 0);

viewer.addPointCloud(cloud, sig, "cloud");

while (!viewer.wasStopped())

{

    viewer.spinOnce();

}

5.如何查找点云的x,y,z的极值?

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#include

#include

#include

pcl::PointCloud::Ptr cloud;

cloud = pcl::PointCloud::Ptr (new pcl::PointCloud);

pcl::io::loadPCDFile ("your_pcd_file.pcd", *cloud);

pcl::PointXYZ minPt, maxPt;

pcl::getMinMax3D (*cloud, minPt, maxPt);

6.如何判断点云中的点为无效点,即坐标值为nan,以及如何将点设置为无效点?

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#include

 

pcl::PointXYZ p_valid;

p_valid.x = 0;

p_valid.y = 0;

p_valid.z = 0;

std::cout << "Is p_valid valid? " << pcl::isFinite(p_valid) << std::endl;

 

pcl::PointXYZ p_invalid;

p_invalid.x = std::numeric_limits<float>::quiet_NaN();

p_invalid.y = 0;

p_invalid.z = 0;

std::cout << "Is p_invalid valid? " << pcl::isFinite(p_invalid) << std::endl;

7.如何将无效点从点云中移除?

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#include

#include

#include

 

typedef pcl::PointCloud CloudType;

CloudType::Ptr cloud(new CloudType);

cloud->is_dense = false;

CloudType::Ptr output_cloud(new CloudType);

 

CloudType::PointType p_nan;

p_nan.x = std::numeric_limits<float>::quiet_NaN();

p_nan.y = std::numeric_limits<float>::quiet_NaN();

p_nan.z = std::numeric_limits<float>::quiet_NaN();

cloud->push_back(p_nan);

 

CloudType::PointType p_valid;

p_valid.x = 1.0f;

cloud->push_back(p_valid);

 

std::cout << "size: " << cloud->points.size() << std::endl;

 

std::vector<int> indices;

pcl::removeNaNFromPointCloud(*cloud, *output_cloud, indices);

std::cout << "size: " << output_cloud->points.size() << std::endl;

8.如果知道需要保存点的序号,如何从原点云中拷贝点到新点云?

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#include

#include

#include

#include

 

pcl::PointCloud::Ptr cloud(new pcl::PointCloud);

pcl::io::loadPCDFile("C:\office3-after21111.pcd", *cloud);

pcl::PointCloud::Ptr cloudOut(new pcl::PointCloud);

std::vector<int > indexs = { 1, 2, 5 };

pcl::copyPointCloud(*cloud, indexs, *cloudOut);

9.如何从点云里删除和添加点?

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#include "stdafx.h"

#include

#include

#include

#include

 

pcl::PointCloud::Ptr cloud(new pcl::PointCloud);

pcl::io::loadPCDFile("C:\office3-after21111.pcd", *cloud);

pcl::PointCloud::iterator index = cloud->begin();

cloud->erase(index);//删除第一个

index = cloud->begin() + 5;

cloud->erase(cloud->begin());//删除第5个

pcl::PointXYZ point = { 1, 1, 1 };

//在索引号为5的位置1上插入一点,原来的点后移一位

cloud->insert(cloud->begin() + 5, point);

cloud->push_back(point);//从点云最后面插入一点

std::cout << cloud->points[5].x;//输出1

如果删除的点太多建议用上面的方法拷贝到新点云,再赋值给原点云,如果要添加很多点,建议先resize,然后用循环向点云里的添加。
10.PointCloud和PCLPointCloud2类型如何相互转换?

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#include

#include

 

pcl::PointCloud::Ptr cloud(new pcl::PointCloud);

pcl::PCLPointCloud2 cloud2;

pcl::io::loadPCDFile("C:\office3-after21111.pcd", cloud2);

pcl::fromPCLPointCloud2(cloud2, *cloud);

pcl::toPCLPointCloud2(*cloud, cloud2);

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