[ros-users] viewing usb webcam stream with rviz

[Benoit Larochelle]

Hi Matt,

You should post this question on answers.ros.org.

RVIZ forces you to give a frame ID to see the image, and this frame ID must “exist”. Often, when you see this error, it’s because you don’t have a TF between your reference frame and your camera frame. You can just publish a dummy TF if you don’t need anything complex.

To help you debug, you can use image_view like Suat suggested, because this one does not require a frame id.

Benoit


From: Suat Gedikli 
Sent: Thursday, April 28, 2011 11:32 AM
To: User discussions 
Subject: Re: [ros-users] viewing usb webcam stream with rviz

Hi, 
try image_view. "rosrun image_view image_view image:=<topic>"
-Suat



On Thu, Apr 28, 2011 at 2:28 AM, Matt McLellan <mattmclel at gmail.com> wrote:

  Hi,

  Does anyone have any experience with viewing a image stream from a usb webcam?

  I have the usb_cam node (part of the bosch_drivers package) running, but I can't seem to view the video in rviz.  It gives me an error saying 'fixed frame does not exist'.  I get the same error when I run the camera using the uvc_camera node as well.

  With both nodes, I can see that the camera is turned on (the led next to the lens lights up), and I can display the raw image dump i a terminal, but what is the best way to actually view the video?

  Thanks.

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