image_view not showing image from web cam

asked 2018-10-05 08:14:12 -0600

Drkstr gravatar image

I am having trouble displaying images from my web_cam using ROS.

I am running the node usb_cam_node

rosrun usb_cam usb_cam_node _pixel_format:=yuyv

Except for these warnings, it seems to be working fine:

[ WARN] [1538744812.140648914]: Camera calibration file /home/rakshak/.ros/camera_info/head_camera.yaml not found.

[ WARN] [1538744812.204086017]: unknown control 'white_balance_temperature_auto'

[ WARN] [1538744812.209835393]: unknown control 'focus_auto'

I can see it publishing into the /usb_cam/image_raw topic using

rostopic echo /usb_cam/image_raw

and it is publishing at apx 30hz.

But when I run

rosrun image_view image_view image:=/usb_cam/image_raw

all I am seeing in this

image description

Environment details:

Running Ubuntu 16.04 in a VM

The host is a Mac, OSX version 10.14

ROS version: Kinetic.

I have confirmed the VM has access to the webcam using the Cheese Webcam Booth.

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Alternatively, You can use RViz to visualize the camera image. Just open RViz, add the topic /usb_cam/image_raw to image. From the image_view screen shot you shared, it seems like an issue of mismatch between the color format. It seems like image_view is expecting an RGB.

vijayaganesh gravatar image vijayaganesh  ( 2018-10-07 14:15:31 -0600 )edit

Thanks for replying! Can you elaborate on what you mean by 'mismatch between the color format'? And how do I get image_view to read the topic and display the image? Cheers.

Drkstr gravatar image Drkstr  ( 2018-10-08 02:08:37 -0600 )edit

Hi! Did you find a solution? I have exactly the same issue. Same system (MAC + Ubuntu 16.04 in a VM). A python code to access the camera via the VM is working.

rolfb gravatar image rolfb  ( 2018-12-31 03:59:49 -0600 )edit

Mine was a vm issue. It sorted itself out when i switched from vmware to parallels.

Drkstr gravatar image Drkstr  ( 2019-01-23 05:36:29 -0600 )edit