Do kinect topics depend on drivers

asked 2012-08-10 01:04:00 -0600

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updated 2016-10-24 09:01:54 -0600

ngrennan
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I happened to have downloaded a bag file of Kinect which was recorded with the help of libfreenect driver. If i develop a node which is for kinect and that uses Openni driver. Will there be differences in the type of topics that are created by both drivers in terms of images and point clouds?

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answered 2012-08-10 08:25:52 -0600

Dan Lazewatsky
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To answer your question directly, yes, the different kinect drivers have different ROS APIs (meaning the topics they publish are different). You can take a look at the wiki pages for the different drivers (kinect_camera which uses libfreenect, and openni_camera, which uses the openni drivers) to compare.

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Thanks it really helped. From this i draw that when i write a node for kinect running on different drivers in ros i should pay attention to the topic names. So that the subscription is not hampered.

Karan ( 2012-08-10 19:19:59 -0600 )edit

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answered 2012-08-10 05:19:00 -0600

gpsinghsandhu
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updated 2012-08-10 07:37:19 -0600

Whenever using a bag file you may play that file

rosbag - and then use rostopic to find revelent info

Update: Lorenz is correct, you can simply use rosbag info

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it helped me thnx bro :-)

Sanket_Kumar ( 2012-08-10 05:20:38 -0600 )edit

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Much simpler: just use rosbag info. It will tell you the topics and types stored in the bag.

Lorenz ( 2012-08-10 07:10:13 -0600 )edit

So in conclusion, you always have the same topics in a .bag file of kinect regardless of being recorded on a laptop having either libfreenect or openni driver? The main question being do drivers affect topics in a bag file.?

Karan ( 2012-08-10 07:41:20 -0600 )edit

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You use the rosbag info command and display the output in your question and using that I will be able to help as I have only worked with openni drivers.

gpsinghsandhu ( 2012-08-10 08:05:55 -0600 )edit

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