ROS Programming: Building Powerful Robots

Visualizing a single image

We cannot use rostopic echo /camera because, as it's an image, the amount of information in plain text would be huge and not human-readable. Hence, we are going to use the following command:

    $ rosrun image_view image_view image:=/camera
  

This is the image_view node, which shows the images in the given topic (the image argument) in a window. This way, we can visualize every image or frame published in a topic in a very simple and flexible manner-even over a network. If you press the right button of your mouse in the window, you can save the current frame in the disk, usually in your home directory, or ~/.ros.

ROS Kinetic also has rqt_image_view, which supports viewing multiple images in a single window but does ...