screen_grab

Capture the screen and publish it on a ROS sensor_msgs/Image topic

Currently this runs as a nodelet. screengrab.launch shows an example launch file, it will probably need to be copied and altered for integration in a real system.

roslaunch screen_grab screengrab.launch

A nodelet image display window will also pop up showing the captured image of the screen, and of course rqt_image_view or any image subscriber can be used.

The built package is available for jade:

sudo apt-get install ros-jade-screen-grab

But building for hydro and indigo ought to work.

A video of an earlier version: https://www.youtube.com/watch?v=Ys9BN4mJ_yc

Some discussion is here: https://plus.google.com/+LucasWalter/posts/f7fLhyWL3A4

Changelog for package screen_grab

0.0.2 (2016-01-26)

0.0.1 (2016-01-22)

• Looks like opencv imshow can't be used from two nodelets in the same group.
• Fixed nodelet xml for image show, now it works
• Install launch files. It looks like image_view has some problems 'Could not create object of class type image_show::ImageShow as no factory exists for it.'
• catkin_lint cleanup
• New image_show was useful for debugging screen_grab nodelet, may move elsewhere later, also is much less cpu than image_view or rqt_image_view. ScreenGrab ndelet is now fully operational. #5
• Looks like the setting/getting of parameters is working now (and maybe can be simplified further), but I haven't run image view as a nodelet yet. I have discovered that connecting to the nodelet manager with a bad node name brings it to a halt (am I not printing output to screen for it?), so maybe my image view command isn't right. If nodelets are that brittle then they become a lot less useful whatever the performance gains.
• Nodelet merged with roi code, also dr is using private namespace.
• Implemented nodelet #5, but need to merge with RegionOfInterest changes
• #4 RegionOfInterest control in parallel to dynamic reconfigure.
• Now dynamic reconfigure is working, though it would be nice to see if I can set slider maximums at start time and override the cfg.
• Now can set the update rate dynamically, there is no Rate::set method but it can just be overwritten with new Rate instance.
• Putting all parameters into a namespace, make sure everything uses relative namespace names
• Have a launch file that also launch image_view
• Using ros parameters to set x,y,width, & height, next add defaults to new launch file.
• Taking code from vimjay screencap to work here, this does no conversion yet.
• Contributors: Lucas Walter