Question

How do I compile c++ code in terminal. Below i have some code to apply Gaussian Filter on an image using OpenCV. I have tried compling using the code

g++ Project2.cpp -o Project2 `pkg-config --cflags --libs opencv` && ./Project2

and it gives me a whole list of errors saying directory not found.

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#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <opencv2/core/core.hpp>
#include <iostream>

using namespace cv;
using namespace std;

int main()
{
Mat image = imread("//u//oowens//First.jpg");
int rows=image.rows;
int cols=image.cols;

if (image.empty())
    {
      cout << "Cannot load image!" << endl;
      return -1;
    }

cout<<"the output for matrix of pixels";

//code to access pixel values of an image
cout<<"\nbefore blur";
for (int i = 0; i <rows; i++)
    {
      Vec3b *ptr = image.ptr<Vec3b>(i);

      for (int j = 0; j < cols; j++)
        {  
      Vec3b pixel = ptr[j];
      //cout<<pixel<<"\t";
        }
      cout<<"\n";
    }

imshow("Image", image);//displaying image
waitKey(0);

Mat image1=image.clone();//cloning image

GaussianBlur( image, image1, Size( 7, 7), 0, 0 );//applying Gaussian filter

cout<<"\nafter blur";

//code to access pixel values of an image
for (int i = 0; i < rows; i++)
    {
      Vec3b *ptr = image1.ptr<Vec3b>(i);

      for (int j = 0; j < cols; j++)
        {  
      Vec3b pixel = ptr[j];
      //cout<<pixel<<"\t";
        }
      cout<<"\n";
    }

imshow("image1:",image1);//displaying image1
waitKey(0);
}

Answer 1

#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <opencv2/core/core.hpp>

these files and you this code cpp file must be in same directory.
Mat image = imread("//u//oowens//First.jpg");
also check if the file directory u r providing right,
if possible put this image file in also in same directory.

use eclipse if possible there these directory problems are very less.