Galto2000's profile - activity

When I make my laptop the ROS master, instead of the Jetson, then it all works as expected. The machine that is starti

remote launch failure on Jetson Howdy folks, I have a laptop and a Jetson Xavier NX on the same gig-network. I wish to

fly360 omnidirectional camera Howdy folks, This is really a "hail Mary" question I suppose. I got a fly360 4K pro came

Howdy folks,

I have question relating to the following transform tree:

[/nav_frame]->[/base_link]->[/sensor_platform] -> [/IMU_AHRS]

The sensor platform is literally a platform that has sensors mounted on it (GPS antenna, IMU-AHRS, etc.) and is attached to the robotic platform (/base_link).

The nav_frame is a local ENU frame in which I do my navigation computations: it's placed on the WGS84 ellipsoid at the same location as the base_link, and it always points north.

I got an IMU-AHRS system (with magnetometer and world magnetic map) mounted on the sensor_platform that I will use to resolve the transformation between nav_frame and base_link.

So, I have the following situation:

[/nav_frame]->[/base_link] UNKNOWN, this is what I need to resolve

[/base_link] ->[/sensor_platform] is a known and fixed transform

[/sensor_platform] -> [/IMU_AHRS] is a known and fixed transform

My Question: Can tf (or tf2) somehow automatically (internally) resolve the hidden transform [/nav_frame]->[base_link] when it's given the measured transform [/nav_frame] -> [/IMU_AHRS] as produced by the IMU-AHRS system, or do I (as the programmer) have to explicitly compute this transform (which is easy enough using the IMU-AHRS measurements and the fixed transforms relating the IMU_AHRS frame w.r.t. the base_link) and explicitly publish this as the [/nave_frame] -> [/base_link] transform?

if tf/tf2 can do this "internally", then how?

Thanks in advance

Best regards,

Galto

roscore fails to run ( symbol lookup error) Howdy folks, I have the following issue when I start roscore: /opt/ros/ki

I posted the question in Gazebo Answers but I haven't gotten any replies. I suspect it might be oscillations in the robo

Not really, but I am planning on posting this question in the Gazebo forum shortly. If I get somewhere with this I'll su

IMU simulator from hector_gazebo_plugins is noisy even when configured to be pristine Howdy folks, I am using GazeboRos

Howdy folks

I am using ROS Indigo on Ubuntu 14.04 LTS.

Since recently when I want to start rqt_image_view, nothing is happening and then I get a segmentation fault.

All other rqt gui plugins appear to work fine (like RVIZ, Bag, etc.).

I un-installed and then re-installed ROS, but that didn't help.

Does anyone have any ideas or suggestions?

Thanks in advance

Galto

Thanks tfoote That's what I figured about tf[2]. Not a big deal, just wanted to make sure I wasn't missing out on bette

Can tf/tf2 resolve "hidden transforms" ? Howdy folks, I have question relating to the following transform tree: [/nav_

Can tf/tf2 resolve "hidden transforms" ? Howdy folks, I have question relating to the following transform tree: [/nav_

Howdy folks

Using the zed_wrapper, I have logged (rosbag) rgb and depth images from a ZED stereo camera, along with camera_info topics, but omitting the actual point cloud data in order to conserve drive space.

When I create the point clouds offline using the the depth_image_proc/point_cloud_xyzrgb nodelet I notice that the geometry is warped.

Question: Do I have to un-distort the rgb and depth image first (e.g. using image_proc) before passing it to depth_image_proc/point_cloud_xyzrgb or does the latter take the distortion parameters automatically into account when creating the point clouds?

Thanks

Galto

Worked like a champ - thanks again!

Thanks for your reply and pointing me to rosbag filter - I'll give it a try.

Howdy folks

So far I have written ROS nodes in C++ and invoked them in launch files.

Now I want to write a ROS command-line utility for off-line processing rosbag files in C++ (using the rosbag C++ API), which doesn't interact with any other nodes per se.

More in particular I want to write a utility that looks for camera_info messages in a given bagfile and change camera calibration and distortion parameters.

My question is: Do I write a command-line utility just like I would write a node in C++, within the catkin build framework? What's different between writing a utility and writing a node in C++? Does anyone know of a good C++ example that I can learn from?

Thanks in advance

Galto