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Questions tagged [ar-track-alvar]

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How to read markers in ar_track_alvar?

Hi there, I was trying to use this pkg ar_track_alvar to detect a tag, and I found out that it keeps recognizing random things as tags. So I want to filter those wrong targets out by using the code ...
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Camera calibration and ar_track_alvar pose

I've managed to get ar_track_alvar working with my distortion-free USB camera. Tag recognition works wonderfully. However, the marker poses detected by ar_track_alvar seem a bit off, meaning the scale ...
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mismatching topics ar_track_alvar_msgs

Greetings~ While trying to reach position/orientation of detected marker, getting this kind of error: ...
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ar_track_alvar publication rate too small

Hello! These days I'm trying to use ar_track_alvar to track ar tags but the publication of ar_track_poses is too slow. I use Ubuntu 16.04 and ros kinetic. My CPU is Intel I7 with 8G memory. When I use ...
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How to make robot_localization work with AR tags

Hi, We are working on a project and we have big issues using robot_localization to work as a global localizer. We are using ROS Kinetic, Gazebo 7.0, a Kinect camera and ekf_localization_node as filter ...
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How to invert coordinate frames of a Transform

I have a fixed transform coming from the ar_track_alvar pkg, that gives me the markers pose into the camera_link. I want to get the inverse of it and save the exact data but reversed. The problem is ...
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How to create a static tf from artags to map frame?

Hi, I am using the ar_track_alvar package to detect artags placed in my environment. When the tags are detected I get a new frame like "ar_marker_1" and this is linked to the robots camera ...
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ar_track_alvar fails to find IndividualMarkers with Kinect

Hello guys, I cannot find a credible reason why my Kinect camera is not able to detect AR Markers, I am using ar_track_alvar with ROS Kinetic, Gazebo 7 and Husky robot. To test the package I placed a ...
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How do I properly use multimarker in an xml file?

I am trying to detect three AR trackers with the ar_track_alvar package link ar_track_alvar package. The three trackers should be detected as a bundle. My xml file which describes the markers looks as ...
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ar_track_alvar does not recognize tags

Hello I have used the ar_track_alvar ROS package to recognise AR Tags. The problem is that it only recognizes tag zero, and for all other tags, it gives wrong and very large ID and is not consistent. ...
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cant get frame_id of ar_track_alvar pose

I am trying to get pose of the camera and set it with respect to the world frame. I want to get the frame_id from msg, so that I can set multiple cameras with respect to world frame dynamically. I am ...
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AR tag tracked, but overlapping with Pointgrey camera

I have a blackfly GigE camera and I want to use it to track a tag. Now the problem is I can detect the tag, but the tag frame is overlap with the camera frame. Does any body have any idea? Thank you! ...
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Why ar_track_alvar is not installing?

When i try to install the ar_track_alvar using sudo apt-get install ros-indigo-ar-track-alvar I was getting the following error. Reading package lists... Done Building dependency tree Reading state ...
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Ar_track_alvar bundle with differents markers size

Hi everyone, I am working with ar_track_alvar package. I would like to use the node "findMarkerBundlesNoKinect" to detect multiple bundles, but in each bundle the master tag's size is ...
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Is it possible to get the distance from the robot to an AR Tag?

I am using the ar_track_alvar package to detect ar tags found here: markers I launch the package using this command: roslaunch ar_track_alvar ar_track_alvar 4.4 0.08 0.2 /camera/depth_registered/...
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How to use sample from AR_track_ALVAR

Hello, I'm trying to run the sample "sampleTrack.cpp". When the program is running it is not able to open the camera because it need to use highgui plugin. So I added Cmakelists.txt from ...
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How to get pointcloud2 data from usb_cam or Pointgrey camera?

Hello, experts~ I am a new in ROS. And recently, I am trying to get image and make it detected by the node ar_track_alvar. However, this ar node requires sensor_msgs/PointCloud2 data. Firstly I tried ...
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unwanted rotation of the markers detected with ar_track_alvar

hello! I discovered something weird with ar_track_alvar but maybe I just forgot something when launching it. I put a mark on the head of a robot and another one one the ground, this is when it is ...
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Frame with two parents in tf2

I have the following task. 'ar_track_alvar' node publishes transformation from a camera to a marker. My own node publishes transformation from a world frame to the marker. My aim is to find ...
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ar_track_alvar source files location

Hi Guys, I'm new to ros and this packages system. I'm trying to edit the cpp files for ar_track_alvar package, yet I can't find where are they, I can only see the header files but not the cpp files ...
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How to use ar_track_alvar for detecting markers using Kinect?

Hello guys, I'm new to ros and want to use it for markers detection. I don't know how to use ar_track_alvar (individualMarkers) in the proper way to make it work using Kinect camera. I'm also confused ...
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How to let ar_track_alvar only detect certain tags

Hi, So, I'm running ar_track_alvar (the groovy branch) to detect ar tags. It all went well except sometimes it detects something that's not a tag as a tag 154 or some other tag that is way off from ...
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problem building ar_track_alvar from source

I am trying to build ar_track_alvar from source which depends on pcl_ros. I recently updated all the packages but this package seems to depend on previous version of pcl how can I build this package ...
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ar_track_alvar crashes camera_nodelet_manager

Hi, I am struggling with the following problem: I am running openni_launch and ar_track_alvar. To minimize data sent over our network, we have set the image and depth mode of the camera to 5 (QVGA). ...
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can't locate node [individualMarkersNoKinect] in package [ar_track_alvar]

I ran sudo apt-get install ros-hydro-ar-track-alvar, but when trying to run ar_track_alvar/individualMarkersNoKinect from a launch file, I get the error: ...
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ar_track_alvar mistake on id

Dear Ros Users, I'm experiencing problem on tag recognition using the ar_track_alvar package: "staring" at the same tag, the id of tag recognized is not stable (for example changing from id:...
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ar_track_alvar publication rate

Dear Ros-users, is there a way to increase the publication rate of the provided tf Transforms: Camera frame (from Camera info topic param) → AR tag frame in the ar_track_alvar package? I'm working on ...
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ar track alvar - kinect

Dear Ros Users, I'm trying to use the ar track alvare package combined with data from kinect. However, I don't understand how I can use the depth camera data, as exposed in the description of the ...
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ar_track_alvar on ARM Odroid-U3

Hi, Has anyone installed ar_track_alvar on arm yet? I'm wanting to do this on an Odroid-U3 which is armv7l. Is it available in Debian, or prebuilt binary? Or most likely I'll need to built from source....
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output_frame on ar_track_alvar

Hello, I would like to test detecting AR Tag with ar_track_alvar launch using IndividualMarkersNoKinect with my IP Camera. Since I published my own image_raw topic and camera_info topic, I have no ...
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ar_track_alvar image topic to point cloud

Hi there! This is my first time using AR Tags in ROS. I already had my camera with /image_raw and /camera_info topics published. However, when I ran "roslaunch ar_track_alvar pr2_indiv.launch&...
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How to get markers pose in a file?

Hi, I am using different AR tags and need to know how I can save their poses into a text file so I can use their poses in a MATLAB code. When I use "echo", it gives me a long list with ...
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Accuracy of AR markers tracking without depth data improvements?

Hi, I have been using the individualMarkers node from the ar_track_alvar package successfully. With the individualMarkersNoKinect however, the detected markers are about 5 cm 'below' the right ...
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ar track alvar - how to detect custom IDs

Hello community! I've got a question about tracking AR Tags with the "ar_track_alvar" package. I set up the package and subscrided to my kinect image topic. Everything runs fine. The tags, ...
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Detecting bundles with more than 3 tags

I'm trying to detect a ar_track_alvar bundle with five tags but it only detects the first three tagfrom the xml. Is it possible to detect bundles with more than three tags? My xml looks like: ...
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ar_track_alvar: no (rgb) camera tracking in bundle detection using kinect?

When running bundledetection (using FindMarkerBundles.cpp) with kinect, the actual tag tracking seems to be based only on the kinect data, as in individual detection (using IndividualMarkers.cpp) the ...
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Faster ar_track_alvar

I'm playing around with ar_track_alvar package. I use it both to initialize amcl and to localize the docking station. It works fine, but is a terrible CPU-hunger. I have changed the code to limit its ...
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Multi-tag bundles detection of ar_track_alvar

I have some problem to detect Multi-tag bundles through ar_track_alvar. According to the wiki, To create a bundle, first choose which tag you want to be the master tag. Treat the center of the master ...
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ar_track_alvar not compiling in Groovy

Has anyone been able to make ar_track_alvar work under ROS Groovy? It's working fine for me in Fuerte, but now I'm seeing the following compilation errors because it can't seem to find btMatrix3x3.h <...
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ar_track_alvar not 32-bit compatible?

I was very happy to discover the ar_track_alvar package, since it will be of great help in a task I am trying to accomplish. Following the instructions on its official ROS page, I have installed it ...
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ar_track_alvar problems with different resolutions

UPDATE - SOLVED I didn't know, but if I change the camera resolution, the calibration needs to be done again. So I calibrated the camera again for the new resolution and the problem was solved. Hi, ...
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