Image_view displays empty gray window

Question

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.

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Originally posted by brein on ROS Answers with karma: 5 on 2013-07-12

Post score: 0

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Original comments

Comment by Brendan Andrade on 2013-07-12:
you can try running rostopic list which will give you a list of current topics. You may be able to tell which topic you want from the list. It might be /camera/image_raw.

Answer 1

Have you checked that the topic is being published (rostopic hz)?

Edit: What nodes other than image_view are you running? From your response, I'd guess that you either forgot to start whatever node you're using to publish camera images, or it's failing. rqt_graph may help you here.

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Originally posted by lindzey with karma: 1780 on 2013-07-12

This answer was ACCEPTED on the original site

Post score: 2

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Original comments

Comment by brein on 2013-07-15:
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.

Comment by joq on 2013-07-16:
Most likely, the driver is not contacting the camera successfully, so it has nothing to publish. Check for driver messages in the log.

Comment by brein on 2013-07-22:
you guys were right, the camera was not publishing images so that was the problem that had to be fixed. thanks for your help