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How can I see images from usb_cam ?

asked 2014-02-19 09:08:27 -0600

4LV4R0 gravatar image

updated 2014-02-19 09:40:56 -0600

Good afternoon.

I have usb_camera installed on my groovy raspbian. I have done : rosparam set usb_cam/pixel_format yuyv and after that I wrote : rosrun usb_cam usb_cam_node

I´m being given :

usb_cam video_device set to [/dev/video0]

       usb_cam io_method set to [mmap]

       usb_cam image_width set to [640]

       usb_cam image_height set to [480]

       usb_cam pixel_format set to [yuyv]

       usb_cam auto_focus set to [0]

      10 frames/sec at 1353855178.185472348

      10 frames/sec at 1353855178.314173063

      9 frames/sec at 1353855178.849589157

      10 frames/sec at 1353855179.782349046

       ...

My rostopic list is the next :

/rosout

/rosout_agg

/usb_cam/camera_info

/usb_cam/image_raw

/usb_cam/image_raw/compressed

/usb_cam/image_raw/compressed/parameter_descriptions

/usb_cam/image_raw/compressedDepth

/usb_cam/image_raw/compressedDepth/parameter_updates

/usb_cam/image_raw/compressedDepth/parameter_descriptions

/usb_cam/image_raw/theora

/usb_cam/image_raw/theora/parameter_descriptions

/usb_cam/image_raw/theora/parameter_updates

What´s the next I have to do to be able to see captured images?

Thanks you so much

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answered 2014-02-19 09:58:35 -0600

davinci gravatar image

If you have a screen connected (and graphical interface) it is easy:

rosrun image_view image_view image:=/usb_cam/image_raw

Otherwise you have to have to look at the multiple machines page: http://wiki.ros.org/ROS/Tutorials/Mul...

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Comments

Thanks for your answer. I´m getting a poor frame rate this time I don´t know why : only 1 or 2 frames/sec. I did it but with this message Xlib: extension "RANDR" missing on display 10.1" What does it mean? Here is the result : https://dl.dropboxusercontent.com/u/11829245/IMG_20140219_235421.jpg

4LV4R0 gravatar image4LV4R0 ( 2014-02-19 10:57:24 -0600 )edit

@4LV4R0 It should be a problem of Raspberry Pi instead of ROS. check this: http://www.raspberrypi.org/phpBB3/viewtopic.php?t=13773&p=205968

lanyusea gravatar imagelanyusea ( 2014-02-19 13:44:16 -0600 )edit

I was using xdrp with a remote desktop on windows. I think the missing message was because it. I get 15, 16 frames/sec but I can´t see the image correctly. Can it be because of the pixel_format wich may could not be supported? With mjpeg it´s horrible: only a few frames, not continous, black screen

4LV4R0 gravatar image4LV4R0 ( 2014-02-19 22:20:07 -0600 )edit

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Asked: 2014-02-19 09:08:27 -0600

Seen: 1,769 times

Last updated: Feb 19 '14