hpurohit's profile - activity

How to upgrade cmake without affecting ros indigo built packages I recently upgraded my cmake to cmake3 in my workstatio

JadTawil I don' understand either why these answers talk about static transforms as Odometry accumulates error and can n

DId you figure it out ?? I am having the same issue

Thanks for this ! works for me

so I figured it out so in the CMakeLists.txt files of both cv_bridge and image_geometry, find package(OpenCV REQUIRED) should be find package (OpenCV 2.4.13 REQUIRED) . This is in my case as I have OpenCV 2.4.13 installed, one can replace it with any version one is using

Hi my question is of two folds. First, I am confused as why there are opencv3 and OpenCV-3.1.0-dev packages is in /opt/ros/indigo/share as i have read that opencv 2.4.8 is the default version of ROS indigo.

Also, I have opencv 2.4.13 version installed on ubuntu 14.04 with ROS Indigo, I want to use opencv for vision part for my project and for that i tried to install vision_opencv package from source. However when I try to build the package using catkin_make following error occurs

-- ==> add_subdirectory(vision_opencv/image_geometry)

CMake Error at /opt/ros/indigo/share/OpenCV-3.1.0-dev/OpenCVModules.cmake:183 (message): The imported target "opencv_xobjdetect" references the file

 "/opt/ros/indigo/lib/libopencv_xobjdetect3.so.3.1.0"

but this file does not exist. Possible reasons include:

• The file was deleted, renamed, or moved to another location.

• An install or uninstall procedure did not complete successfully.

• The installation package was faulty and contained

  "/opt/ros/indigo/share/OpenCV-3.1.0-dev/OpenCVModules.cmake"

  but not all the files it references.

Call Stack (most recent call first): /opt/ros/indigo/share/OpenCV-3.1.0-dev/OpenCVConfig.cmake:86 (include) vision_opencv/image_geometry/CMakeLists.txt:5 (find_package)

-- Configuring incomplete, errors occurred! See also "/home/hemang/catkin_ws/build/CMakeFiles/CMakeOutput.log". See also "/home/hemang/catkin_ws/build/CMakeFiles/CMakeError.log". make: * [cmake_check_build_system] Error 1

What I dont understand is why is it trying to link with Opencv3 when system does not have opencv3 installed or ROS indigo comes with opencv3 now ??

Thanks for the solution

ok so I figured it out, i made a rookie programming error, i was subscribing to wrong topic /ardrone_autonomy/Navdata which should be /ardrone/navdata. Now its working smoothly

I have similar issue, i can see the value in rostopic echo /ardrone/navdata but when i try to subscribe it and print ; it shows nothing.

Hey guys, I am relatively new to ros and c++, i am trying to implement pid controller on ardrone using ros indgio. for doing this I want to calculate(print) the height at which the quadcopter is flying. when I am doing rostopic echo "ardrone_autonomy/Navdata" , i can read the height but when I tried to subscribe to the topic to print the height, I am getting blank in the terminal. following is my code

#include "ros/ros.h"
#include "std_msgs/Empty.h"
#include "ardrone_autonomy/Navdata.h"
#include <iostream> 

using namespace std; 

class trajectory{
public:
  void height(const ardrone_autonomy::Navdata::ConstPtr& hmsg)
  { 
    double x = hmsg->altd; `    
   (ROS_INFO("HEIGHT IS : %f",x); 
  }
}; 

int main(int argc, char **argv)`
{ 
  ros::init(argc, argv, "pid"); 
  ros::NodeHandle n; 
  ros::Publisher takeoff_pub = n.advertise<std_msgs::Empty>("/ardrone/takeoff", 10);
  std_msgs::Empty msg;
  ros::Duration(0.5).sleep();
  takeoff_pub.publish(msg); 
  trajectory traj;
  ros::Duration(0.3).sleep();
  ros::Subscriber sub = n.subscribe("/ardrone_autonomy/Navdata",100,&trajectory::height,&traj);` 
  ros::spin();
  return 0; 
}

Thank you

lucasbpro, did you get the solution ?? I have similar problem. while building the package, it shows the error nav_msgs/Odometry.h is missing. I searched as per instructed above ! there is a file Odometry.msg not Odometry.h