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I am trying to visualize the image stream from Xtion. I am able to see it on RVIZ but the
rosrun image_view image_view image:=/camera/rgb/image_color
command is giving me a blank screen. roswtf gives me this warning
WARNING The following node subscriptions are unconnected: * /image_view_1425967765955436448: * /camera/rgb/image_color
Can you please explain what is happening?
That warning indicates that nothing is being published to the /camera/rgb/image_color topic, but that the image_view has successfully subscribed to it. You should verify that an image from your xtion is indeed published to that topic. To do that, you can use "rostopic hz /camera/rgb/image_color" command. This will output the rate at which images are being published to that topic. If you find that there is nothing being published, use either "rostopic list" or "rosrun rqt_graph rqt_graph", to figure out the correct topic name that you should use. Otherwise you can refer to RViz, under Display types - check which topic you're subscribed to for your Image and check for spelling mistakes.
Because, as I mentioned, no such topic is being published. Your Xtion drivers are not publishing those topics so there is nothing to subscribe in either Rviz or ImageView. Perhaps you can share some info about how you run the Xtion and why you think that the topics should exist and I'll try to help
I am not certain which topics my camera drive are publishing but I am assuming that they must be publishing ../image_raw and ../camera_info So my first question is how to use this published topics and and subscribe to mono or color image which image_proc publishes.
Asked: 2015-03-10 01:14:22 -0500
Seen: 1,593 times
Last updated: Mar 10 '15
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