image_view for ubuntu server 20.04

asked 2021-07-27 01:39:18 -0500

kartiki
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hello i am new to ROS , i am trying to view camera output which is publish by a topic and can be view using following command

            rosrun image_view image_view image:=/camera

however i am getting error as following

     Unable to init server: Could not connect: Connection refused
     (camera:5432): Gtk-WARNING **: 11:53:30.098: cannot open display:
      Segmentation fault (core dumped)

i am using rapsberry pi 3 b+ with picamera , ros version: noetic installed on ubuntu server 20.04. i am not sure whether image_view command pop up a new window to show the camera output bec i am not using desktop version .do i need to intstall ubuntu desktop version to view the output?

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image_view opens a window, so yes, you'd need a desktop environment. Or at least something which supports opening X windows (or perhaps wayland).

If you have another machine, you could start image_view there.

Alternatively: install a VNC server.

Or, as you already mention: install a DE on the machine you're trying to start image_view on.

gvdhoorn ( 2021-07-29 03:35:04 -0500 )edit

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import cv2 import numpy as np cap = cv2.VideoCapture(0) if (cap.isOpened()== False): print("Error opening video stream or file") while(cap.isOpened()): ret, frame = cap.read() if ret == True: cv2.imshow('Frame',frame) if cv2.waitKey(25) & 0xFF == ord('q'): break else: break cap.release() cv2.destroyAllWindows()

image_view for ubuntu server 20.04

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image_view for ubuntu server 20.04