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convert directly from bag to pcd

asked 2019-01-24 00:03:10 -0600

shahrilburt gravatar image

Hi,

I have vlp-16 running with ubuntu 14.04 and Ros indigo, is it possible to convert directly from rosbag to pcd while recording the pointcloud? as we know during recording it generate .bag.active

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Just to clarify do you want to run a node which listens to a point-cloud topic and saves them as a series of .PCD files as they arrive, avoiding the bag file completely. Or do you have a bag file of point cloud messages and you want to extract them all as PCD files?

PeteBlackerThe3rd gravatar imagePeteBlackerThe3rd ( 2019-01-24 07:12:59 -0600 )edit

Yes i was thingking to save the data pointcloud topic with the series of .PCD files avoiding the bag file. Is it possible to do that?

shahrilburt gravatar imageshahrilburt ( 2019-01-24 07:18:09 -0600 )edit

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answered 2019-01-24 08:59:06 -0600

I don't know of any existing node which can do this, but it's a very simple one to write yourself. The point cloud callback function would look like this:

void cloud_cb (const sensor_msgs::PointCloud2ConstPtr& input)
{
  // Convert the sensor_msgs/PointCloud2 data to pcl/PointCloud
  pcl::PointCloud<pcl::PointXYZ> cloud;
  pcl::fromROSMsg (*input, cloud);

  pcl::writeASCII("saved_ascii_cloud.pcd", cloud);
  pcl::writeBinary("saved_binary_cloud.pcd", cloud);
}

You'd need to write a node which subscribed to your PointCloud2 topic with this callback, and add some code to create a numbered sequence of file names.

Hope this gets you going in the right direction.

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Asked: 2019-01-24 00:03:10 -0600

Seen: 254 times

Last updated: Jan 24