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2015-08-02 09:28:04 -0500 commented answer Publishing and Subscribing Vectors

That's right. I guess I should use std_msgs/Float32MultiArray type. Can you give some tips? How can I write publisher and subscriber or create my own message?

2015-08-02 09:03:32 -0500 asked a question Publishing and Subscribing Vectors

Hi,

How can I receive a vector (with unknown length and contains three floats) over Publisher and Subscriber in C++?

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2014-11-10 23:10:03 -0500 answered a question Kinect Installation and Setup on ROS [Updated]

What's the model number of your kinect? Kinect 1473 doesn't work with openni2. Remove ros-indigo-openni2-launch and ros-indigo-openni2-camera. Try to install ros-indigo-openni-launch and ros-indigo-openni-camera. Then following the tutorial and launch the OpenNI driver like this:

roslaunch openni_launch openni.launch

2014-09-07 04:00:51 -0500 commented question save data from pcl to pcd

Hi Did you find the solution? I encounter the same problem and do not know how to deal with. Thanks

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2014-07-07 07:26:06 -0500 answered a question process has died ..

I got this message for wifi configuration. Use GDB to get a backtrace of the process to find out why this happened.

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2014-07-07 04:32:08 -0500 commented answer add opencv to indigo

Thanks for your reply. I do the same and add the lines except the last line (target_link_libraries) since the package is written in python. The package is built correctly but I get following error when using roslaunch for running it: cv_image = self.bridge.imgmsg_to_cv(data, "bgr8") AttributeError: CvBridge instance has no attribute 'imgmsg_to_cv'

2014-07-07 02:16:27 -0500 asked a question add opencv to indigo

The Opencv packages aren't built in the ROS Indigo anymore. So what should I do if I want to add opencv2?

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2014-06-03 01:06:08 -0500 edited question ardrone_autonomy segmentation fault

Hi

I want to run AR.Drone's driver by ardrone_autonomy package.I'm working on ROS fuerte and Ubuntu 12.04. I get Segmentation fault (core dumped) error for following command:

rosrun ardrone_autonomy ardrone_driver

How can I fix this problem?

I get a backtrace of the segfault by GDB:

Copyright (C) 2012 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law. Type "show copying"

and "show warranty" for details.

This GDB was configured as "x86_64-linux-gnu".

For bug reporting instructions, please see:

http://bugs.launchpad.net/gdb-linaro/.. .

Reading symbols from /opt/ros/fuerte/stacks/ardrone_autonomy/bin/ardrone_driver...done.

(gdb) run

Starting program: /opt/ros/fuerte/stacks/ardrone_autonomy/bin/ardrone_driver __name:=ardrone_driver __log:=/home

/soltani/.ros/log/c79b0a0a-0412-11e4-a995-bcf68504b943/ardrone_driver-2.log

warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7ffff7ffa000

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Setting locale to en_GB.UTF-8

Program received signal SIGSEGV, Segmentation fault.

0x0000000000469944 in wifi_config ()

(gdb) bt

0 0x0000000000469944 in wifi_config ()

1 0x0000000000469024 in ardrone_tool_main ()

2 0x000000000043333a in main (argc=1, argv=0x7fffffffde08)

at /opt/ros/fuerte/stacks/ardrone_autonomy/src/ardrone_driver.cpp:702

2014-06-03 00:21:25 -0500 marked best answer tum_ardrone autopilot

Hi

I downloaded and was able to compile tum_ardrone on Ubuntu 12.04. I'm using ROS Hydro.

As the README.txt explain for Autopilot section we should do the following:

  • type command "autoInit 500 800" in top-left text-field

    • click Clear and Send (maybe click Reset first)

    => drone will takeoff & init PTAM, then hold position.

But when I do the same, the drone don't take off. If I click takeoff and then clear and send "autoInit 500 800" command, the drone try to go to the target but can't work properly and don't hold the position. How can I fix this problem? Any idea?

I wonder if I should calibrate the camera and initialize PTAM by myself before sending the commands. Is it necessary?

How much the structure of environment influence the accuracy of the algorithm? Which objects is better to be in the field of view of the camera? Can the AR.Drone work properly in small scales and bounded environments?

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2014-05-31 02:04:31 -0500 commented answer Creating ROS Workspace - catkin_make catkin_pkg error

Also catkin work on hydro version. I wonder if it can work on Indigo.

2014-05-31 02:01:22 -0500 answered a question Creating ROS Workspace - catkin_make catkin_pkg error

sudo apt-get install ros doesn't work on Ubuntu 14.04. You should compile ROS or install Ubuntu 12.04.

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2014-05-29 00:32:46 -0500 commented answer tum_ardrone autopilot

Rabe, many thanks for the reply. It was very helpful. 1. In regards to the first question, you are right. I will try it and post the log files. 2. For tracking ground targets reasons, a front camera of the AR.Drone was taken out and mounted on the bottom of the drone looking downwards. Does the tum_ardrone package work in this situation or I should mount the camera on the first position?

2014-05-28 23:06:54 -0500 commented question ardrone_autonomy segmentation fault

I'm not familiar with GDB. Could you give me a few pointers on how this can be achieved?