Questions tagged [webcam]

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Fixed multi camera tracking system

Are there any ready made packages for tracking mobile robots in an environment, that utilises fixed position cameras? Something like the VICON system, but native to ros, and using off the shelf ...
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Can I turn off the autofocus of an autofocus-webcam?

Hello all, I'm using a Webcam (Logitech HD 720p Autofocus) with OpenCV and ROS. Is it possible to turn off the autofocus of the webcam? I already tried to change the camera parameters by setting the ...
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What is a depth image?

What is a depth image? Does it require a special hardware? Can I get depth image from an inbuilt webcam? Originally posted by Rai on ROS Answers with karma: 30 on 2017-03-13 Post score: 0
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Kinect v2 from image_color to /dev/video0 -- webcam streaming or other

Hey there everyone. I used ROS quite a bit over summer under a different work account but now that I have learned to love ROS, I want to use it to help me stream RGB video from my Kinect v2 for xBox ...
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how to get the image topic from the other computer with WiFi

Hi everyone, I have opened the webcam with usb_cam successfully, and I can see the image_raw topic running. However, I want to get the image_stream from the other computer. How could I do to subscribe ...
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No JPEG data found in image

I am currently running ROS on VirtualBox. After running $roslaunch usb_cam usb_cam.launch ...
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what is the first step of doing image processing with ROS?

hi i am beginner with image processing and want to start that with ROS but i dont know what is the first step ? for example should i first install OpenCV? or its not important ? and may be i should ...
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how to write subscriber and publisher for webcam?

Actually, I am new to ROS and its features. I want to know the code for subscriber and publisher for taking picture from my integrated laptop webcam and store in the hard drive. I am familiar with ...
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PTAM calibration

Hi, Im working on Indigo. I'm trying to use the ethzasl_ptam package. When I ran roslaunch ptam cameracalibrator.launch nothing happened. I edited the launch file ...
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What is the package in Indigo supports webcam in laptop?

Packages available for webcams are only for usb webcam and few for laptop cams but i cant find any Package for Indigo rather than Hydro, so what is the Indigo package supports laptop webcams ...
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Optical flow with bottom camera on aerial vehicle

I'm interested in obtaining an estimation of the linear velocity of the vehicle using optical flow, so which are the best packages for optical flow using the bottom camera of an aerial vehicle? (the ...
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How to use LSD Slam with a USB Webcam

How do you use LSD Slam with a generic USB webcam accessible to /dev/video1? The README's quickstart guide works flawlessly for me with Indigo. However, their instructions for using live_slam with a ...
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Webcam doesn't work in Hydro

As i used the $ roslaunch rbx1_vision uvc_cam.launch device:=/dev/video0 in the book ros-by-example for hydro , i find the output like this : ...
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rviz black background in menu

Hello, I want to use rviz with a webcam. I'm not able to launch rviz if LIBGL_ALWAYS_SOFTWARE is not defined. I need to do "export LIBGL_ALWAYS_SOFTWARE=0". If I go out of rviz and I want to ...
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Webcam does not display when using visp_auto_tracker

Hi everyone, I am trying to get a Logitech webcam to work with visp_auto_tracker to do some QR tracking. I am running ROS Hydro on Ubuntu. I started off with usb_cam and that worked fine with the ...
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usb_cam: [ERROR]Webcam: expected picture but didn't get it

I'm trying to use rosrun usb_cam usb_cam_node to read my web camera, but it keeps returning error: [ERROR] [1392890872.217213339]: Webcam: expected picture but ...
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Extract data from Image.msg

I need to process the data from a webcam (i used USB_CAM Package). Initially I created a listener that from the topic "/usb_cam/image_raw" extrapolates the array uint8 [] data ... but ... ...
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looking for stereo vision howto with 2 USB webcams

Hi! I want to experiment with stereo vision in ROS Groovy using two USB webcams. I found the stereo_image_proc package with the ChoosingGoodStereoParameters tutorial. Unfortunately, it seems to be ...
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Running two different cameras from uvc_camera driver?

Hi, I have a whole robotic system in which I have a camera mounted on a robotic arm. One more camera is mounted on the top of a frame from which I can see my whole robotic system. How can I start two ...
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How I get webcam to my browser using rosbridge

I want to show the webcam of my laptop to browser using ros. I see a better discussion at here. I am uses ros-fuerte. The problem is that I cant able to install gscam , mjpeg_server in my system. How ...
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uvc_cam launching errors/ set_control

Hi! I am trying to get my: Bus 006 Device 007: ID 046d:08f0 Logitech, Inc. QuickCam Messenger to publish its images in ROS. I am now trying to use uvc_cam using a launch file. Problem 1: unable to set ...
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camera_pose_calibration not working in fuerte

Hi there, I would like to extrinsically calibrate a webcam and a asus xtion pro live sensor. Therefore I would like to use the camera_pose_calibration. Everything is intrinsically calibrated and I get ...
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load calibration file

Hi there, I would like to calibrate (extrinsically) a Webcam to my Kinect. For that I need the rectified image of the webcam (usb_cam/image_rect). To get that I calibrated the camera like this ...
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reconfigure parameters for uvc_camera or uvc_cam2

Hi all, I would like to use the uvc_camera driver but the image has some weird coloring. It seems that the parameters are not right. Therefore, I found would like to adjust them. I found a post here ...
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usb_cam package as nodelet

Hi there, At the moment I use the usb_cam package from the bosch_drivers stack to acquire data from a webcam on an an ARM board. (I used the uvc_cam package also but the colors are weird). Because the ...
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Time difference in showed and actual webcam image

Hi all, I'm using a Pandaboard ES (ARM) and would like to synchronize a webcam (logitech c920) and a kinect. I want to grab single frames on a keypress and save pcd and jpg to disk. Unfortunately is ...
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codec type or id mismatches when using usb_cam

Hi all, I would like to use the usb_cam package to integrate my logitech c920 into my project. Unfortunately, I get the following output when I use mjeg as pixel format: ...
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Segmentation fault, stopping uvc camera driver

Hi All, I have an extra logitech QuickCam Messenger VGA Webcam. When I simply try to run it with uvc_cam, it give me a error "Segmentation fault, stopping uvc camera driver. [ERROR] [1351517497....
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streaming video from a ros topic to a client browser

I want to stream live data from my robot to the internet. Right now I have a ROS node communicating with a webcam and publishing Image/CompressedImage data. The robot needs this data to follow lines/...
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ROS and OpenCV: sending single images, image type, and receiving laptop camera stream

WARNING: super beginner For a week or so, me and a few others were working with openCV outside of ROS and we got some things up and running. It has fallen upon me to figure out how to get it all ...
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can't set any settings for uvc_camera

Hi guys, I want to use a webcam with the uvc_camera Package. I'm using Ubuntu 11.10 server and compiled the package from source (because I use an ARM processor). It compiled without any problems but ...
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manual focus with usb_cam

Hi all, I would like to know how I could manually set the focal length. I know that I can set the autofocus option to false in the launchfile of the usb_cam package but where or how can I use the ...
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singleshot / photo with webcamera

Hi everybody, I want to use a webcam as a photocamera which can be triggered to to take single pictures (the sensor is 3.1 MP). I'm pretty new to the imaging part and would like to know how it would ...
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Multiple Camera recording with openCV

Hi, atm my goal is to connect several standard USB webcameras (2-4) to one single computer and try to run/record them at the same time. I'm using MSVS with C++ and the openCV libraries. Getting data ...
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ld: undefined reference to avformat_network_init@LIBAVFORMAT_53

Hi there! I wrote a node that converts webcam images to ROS messages, I am using opencv but the linker yells: ...
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reduction in image quality in ROS

Hi, I am working on iball 12MP camera in ubuntu . The quality of image is good when i view the video using guvcview software. When i launch the camera.launch file and view raw image, the video quality ...
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Take a picture with a webcam from within ROS

I posted this before, but then realized it should probably be its own question! I have been browsing for hours! I am still confused... I am running ROS Diamondback in Ubuntu. My codes compile, but I ...
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2 answers
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usb_cam low FPS from webcam

Hello, I found out I can use usb_cam to publish images from my webcam. I tested it with my laptop's webcam and it performs poorly, only 7 FPS. OS: Ubuntu 11.10 Oneric ROS: Electric (installed via apt-...
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Logitech webcams very "dark" when using uvc_cam

I am running into an issue with the exposure of my logitech webcams. After launching uvc_cam, either camera (logitech 1 or 2) only works properly after manually changing the camera using uvc_cam_node. ...
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