Problem generating PCD from rgbdslam

asked 2011-04-13 02:39:37 -0600

Shark
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updated 2014-01-28 17:09:31 -0600

ngrennan
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I've currently been using a bag file approach to run rgbdslam. The procedure I use is as follows:

I record a bag file with rgbdslam using the command:

rosbag record /rgbdslam/batch_clouds /tf

And then I use the command:

rosrun pcl_ros bag_to_pcd <bag_file_name> /rgbdslam/batch_clouds <destination_directory>

However, the error I get when running the above command is as follows:

[ERROR] [######]: Frame id /base_link does not exist! When trying to transform between /batch_transform and /base_link.

I assume this problem likely has to do with applying the correct transform from the /tf recorded in the bag file. Is there an simple solution to this, or will I need to make an edit to the bag_to_pcd code to work for this specific case?

Thanks

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answered 2011-04-13 22:05:39 -0600

Felix Endres

6468 ●28 ●57 ●93 http://www.informatik....

will I need to make an edit to the bag_to_pcd code to work for this specific case?

Yes, open bag_to_pcd.cpp and replace the one occurence of /base_link by /openni_camera

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answered 2011-04-13 23:32:49 -0600

Shark
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updated 2011-04-13 23:42:10 -0600

So I implemented this as my own package called "bag_to_pcd2." I just want to confirm, but should the output be a series of pcd files? I was under the assumption that it would be one combined pcd file.

If not, I guess I can right my own pcd combiner.

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If so, they should all be in the same frame. Write the pcd files to ascii and you could even concatenate the point clouds with a text editor

Felix Endres ( 2011-04-13 23:57:48 -0600 )edit

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answered 2011-04-14 00:10:21 -0600

Shark
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updated 2011-04-14 00:29:24 -0600

So the bag_to_pcd code is working fine with the bag file provided on the rgbd6dlsm webpage. However, when I try recording it on bag files I've generated, I get a bunch of errors that look like as follows:

[ WARN] [1302782687.209693801]: TF_OLD_DATA ignoring data from the past for frame /openni_depth_frame at time 1.30278e+09 according to authority /bag_to_pcd Possible reasons are listed at

[ERROR] [1302782687.243355116]: You requested a transform that is 103.609 seconds in the past, but the tf buffer only has a history of 0.288 seconds. When trying to transform between /batch_transform and /openni_camera.

Is this likely an error during data collection? As indicated in the original post, I execute the command to start recording before I hit CTRL+P. After I have sent the world model (CTRL+S), I then ctrl+c out of the rosbag record.

And I forgot to thank you for your help in my earlier posts. Your help is very much appreciated

Edit: Nevermind, the converter seems work on occasion with my own bag files.

-Shark

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Not exactly sure why, but restarting roscore seems to remedy this problem. Just a heads up for anyone else who might run into this problem.

Shark ( 2011-04-14 02:52:39 -0600 )edit

Could it be that you still had roslaunch openni_camera openni_node.launch running? Then the kinect_base_linkX nodes publish transforms with newer timestamps

Felix Endres ( 2011-04-14 03:16:24 -0600 )edit

Ahh yes, you're right. I had my openni_camera.launch running too (so turning off roscore inadvertently made me turn off the openni_camera too).

Shark ( 2011-04-15 10:51:30 -0600 )edit

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