Questions regarding usb cameras

asked 2012-03-17 18:33:38 -0600

Sinjon
1 ●1 ●1 ●2

updated 2012-03-18 14:58:54 -0600

Kevin

2952 ●50 ●76 ●113 http://walchko.github.io/

Hi,

I'm new to ROS as well as to linux and has been trying to get the usb camera to work.

I've followed the tutorials from: http://www.ros.org/wiki/ROS/Tutorials/InstallingandConfiguringROSEnvironment and http://www.ros.org/wiki/ROS/Tutorials/StackInstallation and http://www.iheartrobotics.com/2010/05/vision-for-robots-1-of-n-setup.html

but I'm still unable to install it properly. When i try to enter the command $rosmake --rosdep-install I get the error "No package or stack specified. And current directory 'usb_cam' is not a package name or stack name."

Can someone help me? thanks in advance!

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answered 2012-03-17 20:52:55 -0600

I Heart Robotics
403 ●6 ●7 ●17

If you can deal with the code being GPL, you may want to try using this driver http://www.ros.org/wiki/uvc_camera

The tutorials will be updated after Fuerte is released hopefully.

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1

The only caveat is the USB camera has to support USB Video Class (UVC). It seems a lot of them do, but not everything ... for example the camera in my MacBook.

Kevin ( 2012-03-18 03:03:48 -0600 )edit

1

uvc_camera uses video4linux, so it should work with most of the non-UVC cameras that v4l supports. Support for non-UVC cameras is probably going to be moved into a separate node when uvc_camera is replaced with a cross-platform, UVC-only version.

Ken ( 2012-03-18 06:26:15 -0600 )edit

1

Ah ... I am confused. I was referring to libuvc_ros (which does work on my macbook, just not with the built in camera) and got confused with uvc_camera (which I guess uses v4l).

Kevin ( 2012-03-18 14:52:05 -0600 )edit

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answered 2012-03-18 14:53:06 -0600

Kevin

2952 ●50 ●76 ●113 http://walchko.github.io/

updated 2012-03-18 14:58:36 -0600

You can also try libuvc_ros. It works pretty good with Logitech cameras on my MacBook.

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answered 2012-03-28 19:53:06 -0600

Sinjon
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I am finally able to build the package. I was wondering why rosbuild doesn't work but build actually allows me to compile the codes. Also, after running the launch file, i do not see the video on my screen. My webcam is activated though. Here is errors from i get after using the launch file.

started roslaunch server http://ubuntu:51743/

SUMMARY

PARAMETERS * /uvc_camera/device * /rosdistro * /uvc_camera/fps * /uvc_camera/height * /uvc_camera/camera_info_url * /uvc_camera/frame * /rosversion * /uvc_camera/width

NODES / uvc_camera (uvc_camera/camera_node)

auto-starting new master process[master]: started with pid [3224] ROS_MASTER_URI=http://localhost:11311

setting /run_id to e3b85c52-7962-11e1-b7f2-00269e97ef00 process[rosout-1]: started with pid [3237] started core service [/rosout] process[uvc_camera-2]: started with pid [3245] [rospack] opendir error [No such file or directory] while crawling /home/sinjon/ros_workspace

[rospack] opendir error [No such file or directory] while crawling /home/sinjonros_workspace

opening /dev/video0 pixfmt 0 = 'YUYV' desc = 'YUV 4:2:2 (YUYV)' discrete: 640x480: 1/24 discrete: 352x288: 1/24 discrete: 320x240: 1/24 discrete: 176x144: 1/24 discrete: 160x120: 1/24 int (Brightness, 0, id = 980900): 0 to 127 (1) int (Contrast, 0, id = 980901): 0 to 127 (1) int (Saturation, 0, id = 980902): 0 to 127 (1) int (Hue, 0, id = 980903): -180 to 180 (1) bool (White Balance Temperature, Auto, 0, id = 98090c): 0 to 1 (1) int (Gamma, 0, id = 980910): 1 to 500 (1) menu (Power Line Frequency, 0, id = 980918): 0 to 2 (1) 0: Disabled 1: 50 Hz 2: 60 Hz int (White Balance Temperature, 0, id = 98091a): 2800 to 6500 (1) int (Sharpness, 0, id = 98091b): 0 to 127 (1) int (Backlight Compensation, 0, id = 98091c): 0 to 2 (1) bool (Exposure, Auto Priority, 0, id = 9a0903): 0 to 1 (1) current value of 10094851 is 1 unable to set control: Invalid argument ERROR: could not set some settings.
unable to set control

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also, i am trying to get my USB camera to work and i also have a inbuilt laptop camera. Currently it is activating my laptop camera. How do i switch over to the usb camera?

Sinjon ( 2012-03-28 20:03:50 -0600 )edit

I have the same failure message (ERROR: could not set some setting)... could you solve the problem?

dinamex ( 2012-07-06 11:28:10 -0600 )edit

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answered 2012-03-18 17:48:49 -0600

Sinjon
1 ●1 ●1 ●2

I've managed to figure out how to install the dependancies but have been trying to run the package. After typing in the following:

roslaunch ~/ros/stacks/camera_umd/uvc_camera/launch/camera_node.launch

i get this error:

Cannot locate installation of package uvc_camera: [rospack] opendir error [No such file or directory] while crawling /home/sinjon/ros_workspace [rospack] opendir error [No such file or directory] while crawling home/sinjon/ros/stacks [rospack] couldn't find package [uvc_camera]. ROS_ROOT[/opt/ros/electric/ros] ROS_PACKAGE_PATH[/home/sinjon/ros_workspace:/opt/ros/electric/stacks:home/sinjon/ros/stacks]

The package is in home/sinjon/ros/stacks/camera_umd/uvc_camera

did i do something wrong?

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One you downloaded it, you need to make sure the directory is in your path and that you run rosmake to compile it.

The tutorials might help. http://www.ros.org/wiki/ROS/Tutorials/InstallingandConfiguringROSEnvironment http://www.ros.org/wiki/ROS/Tutorials/BuildingPackages

I Heart Robotics ( 2012-03-20 15:27:04 -0600 )edit

One you downloaded it, you need to make sure the directory is in your path and that you run rosmake to compile it.

I Heart Robotics ( 2012-03-20 15:27:07 -0600 )edit

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