simbha's profile - activity

Yes, You can use the usb_cam package for same. In the usb_cam_test.launch you can change the video_device to access the

What do you mean by size of topics? You can get the number of messages in the particular topic and data type using rosba

HI, yes, you are right the encoder based localization is accurate. Make sure you are using the Ideal differential drive

try sourcing the environment source /opt/ros/<distro>/setup.bash

HI, yes, you are right the encoder based localization is accurate. Make sure you are using the Ideal differential drive

HI, yes, you are right the encoder based localization is accurate. Make sure you are using the Ideal differential drive

HI, yes, you are right the encoder based localization is accurate. Make sure you are using the Ideal differential drive

HI, The encoder based localization is accurate. Make sure you are using the Ideal differential drive model(wheels axis

Install the g++ compiler sudo apt-get install build-essential and then sudo apt-get install g++

Hi, These Aux channels are available to other facilities. As @partik mentioned. rcAUX4 channel is used for arming and d

Hi, These Aux channels are available to other facilities. As @partik mentioned. rcAUX4 channel is used for arming and d

Hi, I have installed the rqt_tf_tree. while running the command rosrun rqt_tf_tree rqt_tf_tree and getting the following terminal.

PluginHandlerDirect._restore_settings() plugin "rqt_tf_tree/RosTfTree#0" raised an exception:
Traceback (most recent call last):
  File "/opt/ros/indigo/lib/python2.7/dist-packages/qt_gui/plugin_handler_direct.py", line 116, in _restore_settings
    self._plugin.restore_settings(plugin_settings_plugin, instance_settings_plugin)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/rqt_tf_tree/tf_tree.py", line 129, in restore_settings
    self._refresh_tf_graph()
  File "/opt/ros/indigo/lib/python2.7/dist-packages/rqt_tf_tree/tf_tree.py", line 138, in _refresh_tf_graph
    self._update_graph_view(self._generate_dotcode())
  File "/opt/ros/indigo/lib/python2.7/dist-packages/rqt_tf_tree/tf_tree.py", line 147, in _generate_dotcode
    force_refresh=force_refresh)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/rqt_tf_tree/dotcode_tf.py", line 97, in generate_dotcode
    self.graph = self.generate(data, timer.now().to_sec())
  File "/opt/ros/indigo/lib/python2.7/dist-packages/rqt_tf_tree/dotcode_tf.py", line 137, in generate
    root,
UnboundLocalError: local variable 'root' referenced before assignment

I run with superuser also but the same error. can anybody help?

accept the answer and thumps up

no its work, i have worked on the same

check using rostopic list. in freenect_launch it will be something camera/depth/image_raw

check using rostopic list'. infreenect_launchit will be somethingcamera/depth/image_raw`

is this command is also giving error? rosrun image_view image_view image:=<image_topic_name>

OK, KSWang. The first error is due to the camera calibration file. You need to calibrate the camera. follow the step h

OK, KSWang. The first error is due to the camera calibration file. You need to calibrate the camera. follow the step h

Try installing the image_proc package

can you show the errors!

@gvdhoorn is right if you have successfully installed the ROS then you can install the usb_cam by cloning the package fr

if you have successfully installed the ROS then you can install the usb_cam by cloning the package from git. Create a

Hello, I have installed the ROS2 along with the ROS1 melodic (18.04). It doesn't give any conflict with ROS1. Actually,

Hello, I have installed the ROS2 along with the ROS1 melodic (18.04). It doesn't give any conflict with ROS1. Actually,

in case of rosservice, your client should run before the server. if you keep these script in the launch file, then this

Not exactly, the car is based on Ackerman model. You need to use some different planner for that. look at this

Not exactly, the car is based on Ackerman model. You need to use some different planner for that

Each one had its own advantage. we generally use the roslaunch when we have multiple scripts to work. If you want to ru

Each one had its own advantage. we generally use the roslaunch when we have multiple scripts to work. If you want to ru

Yes, Actually pixel value needed to be changed, I check that yuyv support only max 30 FPS. I changed to mjpeg

I am using this usb_camera. I want to use the frame rate 120FPS 640x480. I passed the parameter <framerate> in launch file. But when i check the average rate of topic `rostopic hz usb_cam/image_raw . its showing 30HZ only. Actually it should be 120 !!!

I also try hardcoding the ros::Rate to 120, but is doesn't effect the output of average rate.

  bool spin(){
   ros::Rate loop_rate(this -> framerate_);
    while (node_.ok())
    {
    if (cam_.is_capturing()) {
    if (!take_and_send_image()) ROS_WARN("USB camera did not respond in time.");
   }
   //ROS_INFO("framerate_ '%i'", framerate_ );
   ros::spinOnce();
   loop_rate.sleep();
}
return true; }

Are there any restrictions on increasing the framerate above 30FPS. When I change the frame rate below 30 is show the changes but not above the 30FPS. My usb_cam launch file parameters are as:

  <node name="usb_cam" pkg="usb_cam" type="usb_cam_node" output="screen" >
<param name="video_device" value="/dev/video0" />
<param name="image_width" value="640" />
<param name="image_height" value="480" />
<param name="pixel_format" value="yuyv" />
<param name="camera_frame_id" value="usb_cam" />
<param name="io_method" value="mmap"/>
<param name="framerate" value="120" />
</node>

How can I change the framerate in usb_cam above 30FPS.