Questions tagged [opencv]
OpenCV (Open Source Computer Vision) is a cross-platform library of programming functions for real time computer vision.
472 questions
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OpenCV can't be used in ROS
I have been trouble by opencv problems. I have planed to transport my windows's code into ROS, which I have tested by local video files. I found that ROS doesn't support local video files, until ...
Yongqiang Gao
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How to synchronize image and marker display between two ROS nodes
I have two ROS nodes, a "display node" and a "detector node", that both use cv_bridge and subscribe to the same image topic. The detector node publishes an array of ROI boxes ...
Pi Robot
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OpenCV modification and re-compiling
Hi all,
I need to modify an OpenCV module (ML) and I would like to know how I can do it for the version of OpenCV included in ROS.
Thank you
Walter
Originally posted by Myzhar on ROS Answers with ...
- 198
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OpenCV VideoCapture Not Working in Diamondback?
Hi all, I recently updated my diamondback version to the latest version and I realised that my packages that I had written previously that used OpenCV's VideoCapture (webcam) fail to work. That is the ...
dkst
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Opencv python LineIterator returning position information?
In the python sample for InitLineIterator here:
Copied below for convenience:
>>> import cv
>>> img = cv.LoadImageM("building.jpg", cv.CV_LOAD_IMAGE_COLOR)
>>> li = cv.InitLineIterator(img, (100, 100)...
Marrok
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Proper source of xncore for compiling svn opencv with openni support?
I've just upgraded my opencv svn to 2.2.9 and am building it with OpenNI support on a Ubuntu 10.10 64-bit system, already having installed the apt-get available openni-dev (either because I have ros ...
- 3,397
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Cannot play AVI files with Diamondback Debian OpenCV
I can't seem to play AVI files using the latest ROS OpenCV Debian packages under Diamondback and Ubuntu 10.04. Is anyone else able to do this? I am wondering if the Debian packages were compiled ...
Pi Robot
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OpenCV Error: Image step is wrong () in cvInitMatHeader
Hi,
Recently, whenever I enter the command "rosbag record -a" while trying to run vslam, my bumblebee camera will stop working and the following error comes up:
...
ccm
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Convert from a sensor_msgs::CompressedImage message to IplImage
I'm saving test videos in a JPEG compressed bag file. Then I try to use it as input to a subscriber that listens to the "/camera/image/compressed" topic and convert it to OpenCV's IplImage ...
GeorgeAprilis
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How to display CV_32FC2 images in ROS
I'm trying to use OpenCV to calculate real-rime optical flow and display it in ROS. The task, using provided OpenCV's functionality, seems fairly easy. I've used ...
tom
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Is OpenCV compatible with pyqt?
hello there,
I am using ROS to develop a system in my research. So, I am retrieving video images from the robot and I want to draw a circle on the screen to the object that the robot recognizes.
I ...
Shamma
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Scores of tod_detecting / tod_training in "Solutions in Perceptions Challenge 2011" , details available?
Hello, are there details on how well ROS packages tod_training and tod_detecting performed at "Solutions in Perceptions ...
Julius
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ROS, Camera1394, and libusb issue
Hello,
This is a repost of a question asked over at Ask Ubuntu where I thought this might be more appropriate, but sadly I didn't get any bites.
I'm trying to get up and running with a Point Grey ...
Bradley Powers
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ROS Answers SE migration: bgr2hsv oddity
Usinge OpenCV cvCvtColor to convert BGR images to HSV. Seems to work fine, but the channel order is not what I expect. Assumed I would see HSV ordering, but using COI or cvSplit, looking visually at ...
sneiman
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Working package for fiducial pose recognition?
Hi all,
I've been trying to compile the fiducial package (http://www.ros.org/browse/details.php?name=fiducial) without success due to a compilation error in its dependency, opencv_candidate (http://...
Billy
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ROS Answers SE migration: kinect opencv
I'm trying to use the depth data obtained by kinect with C++ program.
I've already installed openni_kinect with the guide(http://www.ros.org/wiki/openni_kinect,
OpenNI itself is installed in this ...
dinect
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How to use very latest OpenCV version in ROS?
I am trying to use the very latest version of OpenCV in ROS because I want to integrate a critical bugfix from OpenCV. From what I read OpenCV is integrated by some 'magic' mechanism. Is it simply ...
Julius
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Camera pose calibration with multiple camera's
Hi,
we're using the camera_pose_calibration package and try to calibrate multiple camera's with it.
We followed the instructions at http://www.ros.org/wiki/camera_pose_calibration - which went well.
...
Steven Bellens
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32
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Putting a sensor_msgs/Image into a message, getting it back, and converting it for OpenCV?
I'm just doing this wrong somehow.
I've got a Sensor_msgs/Image already. I want to put it into my message which has "Sensor_msgs/Image image" in it's definition.
Can I just do this:
...
Murph
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Why are corners not detected in images with chessboard fiducials?
Using pose_estimator in tod_training for creating a training base, I wonder why sometimes the pose estimation fails. On fat_free_milk from tod kinect training data pose could be estimated on all of ...
Julius
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1
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5
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OpenCV camshift.py sample broken after Diamondback upgrade
Hello OpenCV + ROS users,
I will submit a ticket for this but I'm wondering if anyone has a quick fix in the meantime. I was using the camshift.py OpenCV Python sample successfully under Cturtle. ...
Pi Robot
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1
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66
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YUYV/YUV422 in image_transport
Most of USB webcams used in hobby robotics support YUYV coding natively. Currently both OpenCV and ROS by default convert this image to BGR format and this is not most efficient decicion for most ...
Tõnu Samuel