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2013-11-18 22:08:55 -0500 received badge  Famous Question (source)
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2013-07-22 05:04:30 -0500 commented answer Image_view displays empty gray window

you guys were right, the camera was not publishing images so that was the problem that had to be fixed. thanks for your help

2013-07-15 08:15:21 -0500 received badge  Notable Question (source)
2013-07-15 05:49:21 -0500 commented answer Image_view displays empty gray window

I used rostopic hz /camera/image, which returned the message 'subscribed to [/camera/image]'. I then did rostopic list -p, which returned nothing, as well as rostopic list -s, where /camera/image appeared. It looks like /camera/image is a subscriber and that nothing is being published to the topic.

2013-07-13 01:16:11 -0500 received badge  Popular Question (source)
2013-07-12 06:01:03 -0500 asked a question Image_view displays empty gray window

I have not been able to make image_view work. Currently, when I run it a gray screen displays rather than an image.

My first thought is that that I don't have the topic correctly entered. I have tried rosrun image_view image_view image:=/camera/image and rosrun image_view image_view image:=/gscam/image_raw. Both lead to the same result. All of the packages needed are downloaded and compiled.

2013-06-20 19:05:28 -0500 received badge  Notable Question (source)
2013-06-15 06:52:15 -0500 commented answer Do not know why the master node is not running

you were both right, that was exactly it. thanks a lot you guys, I understand much better how ROS runs now

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2013-06-15 05:51:36 -0500 received badge  Popular Question (source)
2013-06-14 06:51:41 -0500 asked a question Do not know why the master node is not running

I have an iRobot create, and after installing my packages and running a script, I get the error: Unable to register with master node [http://tahoma:11311]: master way not be running yet.

This seems to be a common problem, but I haven't been able to make the troubleshooting solutions work. I ran roscore - no errors pop up, and I expected this would start up the master node. But running the script still returns the original error.

What explanations could there be for the master node to not be running?