Ameer Hamza Khan's profile - activity

Have you tried usb_cam package. It will automatically start the required service for camera calibration.

Can you provide the snippet of your node? It may help in identifying the problem.

Is it also possible to specify the serial port e.g. Serial1, Serial2 for Arduino mega or a software serial port?

Download common messages from here: https://github.com/ros/common_msgs and place it in src folder. Then run catkin_make

@fdsa1860 I was not able to install ROS on OSX El-Capitan, so i switched to Linux on VM.

@Marouane Here is the link https://drive.google.com/file/d/0B6L5... To change the webcam, you need to change the cv::VideoCapture cap(0) line in main function.

@130s I have opened already opened a new question here http://answers.ros.org/question/22452...

I am trying to install ROS on OS El Capitan by following instruction given on this link, https://gist.github.com/jmtatsch/3aa268d41ae40c89b35a but at line 80 I am getting following error

ERROR: the following packages/stacks could not have their rosdep keys resolved
to system dependencies:
roslisp: Missing resource geneus

What is the reason of this error and how to resolve it?

I am getting same error with

roslisp: Missing resource geneus

How to solve this?

I am trying to install ROS on OS X El Capitan and during installing of ardrone_autonomy it gives this error

No definition of [libiw-dev] for OS [osx]

Is there any workaround this problem?

https://github.com/MicrocontrollersAn...

Image_proc is only used for image rectification. For general purpose application u should use OpenCV. I suggest to start with this tutorial. Although written for visual studio for windows but you can easily use it in linux. It will give u general intro of openCV.

Image_proc is only used for image rectification. For general purpose application u should use OpenCV. I suggest to start with this tutorial. Although written for visual studio for windows but you can easily use it in linux. It will give u general intro of openCV.

https://github.com/MicrocontrollersAn...

The callback function for subscriber nodes are called on ros::spinOnce() execution. Modify your code like this:

//Initiate the ROS

ros::init(argc, argv, "waypoint_nav");
ros::NodeHandle n;

velocity_publisher = n.advertise<geometry_msgs::Twist>("/cmd_vel", 10);

pose_subscriber = n.subscribe("/ardrone/navdata", 10, poseCallback);

while(ros::ok())
{
    ros::spinOnce();
    cout<<endl<<"Roll :"<<roll<<endl;
}

I think you were missing roscore. What do you want to know about image processing? Do you know openCV?

@fatima ! had this solution worked for you?

Just download package from this link extract it in your work_space/src run catkin_make and then rosrun webcam_pub webcam_pub.

Then you can use image_view image_view image:=/webcam/image_raw

But i have just written my own package for integrated laptop webcam. I will try to upload and give you link here.

Actually, the problem is you are not getting the image from webcam, just using image_view can't show you image. You have to get the image on image:=/Image/topic. If you were using usb webcam it would have been much easier but for integrated webcam i am not able to find any package for indigo.

What type of camera are you using? Webcam or some else?

I am working on a vision-based localization project in which I have to estimate the position of an object using a webcam and then use that localization information to control an AR.Drone 2.0. For AR Drone ROS already have an ardrone_autonomy package ( http://wiki.ros.org/ardrone_autonomy ). But So far I haven't been able to find a camera-based localization package. I have tried this package ( https://github.com/lrse/whycon ) which is excellent but still in development stages. Is there any ROS package which can solve this problem?

@Gray Servin, yes that was missing. Thanks.

Here is my code

#include <iostream>
#include "ros/ros.h"
#include "std_msgs/Empty.h"
#include "std_msgs/Int32.h"
#include "std_msgs/Float32.h"
#include "geometry_msgs/Twist.h"
#include "ardrone_autonomy/Navdata.h"

#include "std_msgs/String.h"
#include <sstream>

int     state = 1, y = 1;//, battery, rotX, rotY, rotZ;

void callBack(const ardrone_autonomy::Navdata::ConstPtr& data) {
    state = data->state;
    y = 2;
}

int main(int argc, char **argv)
{
ros::init(argc, argv, "ardrone_fly");

ros::NodeHandle ardrone;

ros::NodeHandle output("output");
ros::Publisher pub_t = ardrone.advertise<std_msgs::Empty>("/ardrone/takeoff",1000);
ros::Publisher pub_l = ardrone.advertise<std_msgs::Empty>("/ardrone/land",1000);
ros::Publisher pub_f = ardrone.advertise<geometry_msgs::Twist>("/cmd_vel",1000);
ros::Publisher pub_s = ardrone.advertise<std_msgs::String>("state",1000);

ros::Subscriber sub = ardrone.subscribe<ardrone_autonomy::Navdata>("/ardrone/navdata",1,callBack);

std_msgs::Empty emp;
int x;

ros::Rate loop_rate(50);

std::stringstream ss;
std_msgs::String state_s;

while(ros::ok()) {
    //ROS_INFO("state: %d  ",state);

    ss << "State is: " << state << " y: " << y;// << " Battery is: " << battery;
    state_s.data = ss.str();

    pub_s.publish(state_s);

    if(state==2) {
        pub_t.publish(emp);
    }
    else
        pub_f.publish(msg);

    loop_rate.sleep();
}

pub_l.publish(emp);

ros::spin();

return 0;
 }

When i run this code, the callBack function is not being called, although rostopic echo /ardrone/navdata is showing that data is received. What is going wrong?