What is the "proper" way to compensate for a (possibly) variable offset?
I have a robot arm -- Universal Robots UR5 & UR10 -- and I'm looking for the most natural way to compensate for the mounting location and angle of various grippers. Most grippers are not mounted in...
View ArticleCamera Pose Calibration
Is there an equivalent package to **camera pose calibration** in ROS Hydro? Finding the exact transform connecting the frame of a new camera to an existing robot's **tf** tree is almost impossible ...
View Articlemake tf from rosbag data raw
Hello, I am trying to make tf tree from rosbag file and raw topics like /imu/data and /scan without tf topic. At the time when record the bagfile, we don't know the tf jet and now we want to make the...
View Article[TF] Extrapolation into future - Wierd Chain?
Hey everyone, I have the issue, that while running moveIt, I get transforms errors: [ERROR] [1410959502.463512661]: Transform error: Lookup would require extrapolation into the future. Requested time...
View Articleodom → base_footprint
Stage_ros publishes this, now I want to try simulating using STDR but it doesn't use the same nomenclature. How can I calculate this transform and what does it represent exactly in a real world scenario.
View ArticleRebroadcast tf transforms with different frame_id on the fly
Due to some nomenclature difference between some packages and some simulator (especially considering tf transforms) I am looking for a nice way to change the frame_id and child_frame_id of some tf...
View Articletransform listener can not look up /map frame
Dear All, I am asking a weired question about the transform listener. I have tried the following two code, one with lookup base_link to odom and one to look up base_link to map. The result is I can get...
View Articleamcl localisation on custom made bot
Hi! This is part of my final year project work. I am facing multiple problems and i need help. I am aiming to build a robot that can localize itself on a known map and navigate to certain given points...
View Articlemore than one odom->base_link transform
Hello, I am using rtabmap rgbd_odometry node and data from IMU feeded to robot_pose_ekf node. This gives me stable odometry. This stable odometry data publishes a odom->base_link transform. Apart...
View Articlestereo_image_proc PointCloud2 transform
Im using a Bumblebee2 stereo camera, and using the camera1394stereo package to interface with the camera. I then plug the outputs of that node into stereo_image_proc, to get a point cloud, which i...
View ArticleRViz keep saying "No transform from [front_left] to [base_link]"
I have a package named sp1s, I added a URDF, as simple as below: Here is the launch file I edited: When I launch it by "roslaunch sp1s display.launch model:=urdf/sp1s.urdf", the Rviz keep saying "No...
View Articlemove_base - missed desired rate
Hi all, I have a quite high level question. I'm currently trying to unplug the amcl node from the navigation stack and substitute it with a custom localization algorithm. Although I'm able to broadcast...
View ArticleWhy is pcl_ros::transformPointCloud changing the frame_id
Hi, if got the following code: cloud_out->header.frame_id = ""; tf_listener_->lookupTransform( frame_out, frame_in, stamp, transform); ROS_INFO("Frame before: %s",...
View ArticleNo Transform to fixed frame map
I am getting a transform error which I have not seen in hydro. I am having difficulty understanding the origin of this error. I am sending a scan to slam gmapping. Thank you for looking at this....
View Articlemystery of the missing transform in rviz
Why is there not a line from camera_frame to object_position  
View Articletf error: Lookup would require extrapolation into the past
Hi, all. I want to convert a pose from "odom" to "map", I am using codes as follows. void PeopleAgent::TransformPos(const people_msgs::PoseArrayWeighted &msg) { boost::mutex::scoped_lock...
View ArticleTransform Configuration Step
Hello, I'm using Ubuntu 14.04 and ROS indigo. I'm trying to setup my robot to be used with the navigation stack These are the steps that I should follow before using the navigation stack: 1) Transform...
View ArticleCalculating with TF/TF2
Hi, Currently I have a two interactive markers in the map frame. Now I want to the coordinates of a point on the line between them with a distance x from one of those points. Can TF/TF2 do that, if...
View Articleuv coordinates to world map coordinates
I'm working with turtlebot and I've built and saved a map using gmapping. I'm wondering if there is a funtion that transforms uv coordinates from map picture into world map coordinates. Or if there...
View ArticleHow to save static transforms in bag files?
How do I save a static transform in a bag file so I get a self contaned bag file that can be replayed? Not it seems like for example rviz do not understand a static transform in a bag file.
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