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Im running an piece of code from this the OpenCV website: http://docs.opencv.org/2.4/doc/tutorials/imgproc/imgtrans/filter_2d/filter_2d.html#filter-2d

#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <stdlib.h>
#include <stdio.h>

using namespace cv;

/**
 * @function main
 */
int main ( int, char** argv )
{
  /// Declare variables
  Mat src, dst;

  Mat kernel;
  Point anchor;
  double delta;
  int ddepth;
  int kernel_size;
  const char* window_name = "filter2D Demo";

  int c;

  /// Load an image
  src = imread( argv[1] );

  if( src.empty() )
    { return -1; }

  /// Create window
  namedWindow( window_name, WINDOW_AUTOSIZE );

  /// Initialize arguments for the filter
  anchor = Point( -1, -1 );
  delta = 0;
  ddepth = -1;

  /// Loop - Will filter the image with different kernel sizes each 0.5 seconds
  int ind = 0;
  for(;;)
       {
         c = waitKey(500);
         /// Press 'ESC' to exit the program
         if( (char)c == 27 )
           { break; }

         /// Update kernel size for a normalized box filter
         kernel_size = 3 + 2*( ind%5 );
         kernel = Mat::ones( kernel_size, kernel_size, CV_32F )/ (float)(kernel_size*kernel_size);

         /// Apply filter
         filter2D(src, dst, ddepth , kernel, anchor, delta, BORDER_DEFAULT );
         imshow( window_name, dst );
         ind++;
       }

  return 0;
}

I type in the terminal "g++ open.cpp -0 open apple.jpg" and i get an error saying "

apple.jpg: file not recognized: File format not recognised

collect2: error: ld returned 1 exit status" Any ideas on fixing this? I did use jpg and jpeg format, both returned the same error