In ran the usb_cam node with `rosrun usb_cam usb_cam_node` the images are published and i ensured that with `rostopic echo /usb_cam/image_raw`but when i tried running `rosrun image_view image_view image:=/usb_cam/image_raw` to view the published images a blank (black) window pops up and image is not shown. how to fix it.
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