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When I use OpenCV 2.4,the image does not load!

In my prev problem, I found out that the image doesn't load in my project when I use OpenCV 2.4 so I couldn't create CSV file.

when I was using OpenCV 3.0.0 every thing was OK and I could load the image via imread

but now I'm using OpenCV 2.4 but the image doesn't load and always img.empty() command return true

here is my code but the img is null:

// faceRecognitionTest.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <string>
#include "opencv2\contrib\contrib.hpp"
#include "opencv2\core\core.hpp"
#include "opencv2\highgui\highgui.hpp"
#include "opencv2\objdetect\objdetect.hpp"
#include "opencv2\opencv.hpp"
#include "opencv2\imgproc\imgproc.hpp"
#include "FaceRec.h"

//file handling
#include <fstream>
#include <sstream>

using namespace std;
using namespace cv;


Mat img;
bool b=false;
int _tmain(int argc, _TCHAR* argv[])
{
 img = imread("f.jpg",CV_LOAD_IMAGE_GRAYSCALE);
    if (b=img.empty())
    {
        return -1;
    }


    saveMatToCsv(img,"mycs.csv");

    //fisherFaceTrainer();
    return 0;
}

When I use OpenCV 2.4,the image does not load!

In my prev problem, I found out that the image doesn't load in my project when I use OpenCV 2.4 so I couldn't create CSV file.

when I was using OpenCV 3.0.0 every thing was OK and I could load the image via imread

but now I'm using OpenCV 2.4 but the image doesn't load and always img.empty() command return true

here is my code but the img is null:

// faceRecognitionTest.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <string>
#include "opencv2\contrib\contrib.hpp"
#include "opencv2\core\core.hpp"
#include "opencv2\highgui\highgui.hpp"
#include "opencv2\objdetect\objdetect.hpp"
#include "opencv2\opencv.hpp"
#include "opencv2\imgproc\imgproc.hpp"
#include "FaceRec.h"

//file handling
#include <fstream>
#include <sstream>

using namespace std;
using namespace cv;


Mat img;
bool b=false;
 int _tmain(int argc, _TCHAR* argv[])
{
 img = imread("f.jpg",CV_LOAD_IMAGE_GRAYSCALE);
    if (b=img.empty())
(img.empty())
    {
        return -1;
    }


    saveMatToCsv(img,"mycs.csv");

    //fisherFaceTrainer();
    return 0;
}