Can not read image in opencv

Question

I am new to opencv and I am starting to make a simple code to read and display image in gui ,I am working in qt IDE, first I wirte this block of code

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


int main()
{
   cv::Mat image=cv::imread("image.jpg");
   cv::namedWindow("My Image");
   cv::imshow("My Image",image);
   cv::waitKey(0);
   cv::destroyAllWindows();
   return 1;
 }

But it displays a white window and error in console and then display another window "not responsive" message and then stop working, This is a screen shot http://pbrd.co/1u2A0ow Then I wrote another validity code to check wheater or not the image is been read

int main()
{

Mat image;
cout<<"Size is"<<image.size().height<<","<<image.size().width<<endl;

image=imread("image.jpg");

//Checking first if the image have been read
if(!image.data)
{
    cout<<"\n No image has created \n"<<endl;
}

return 1;

}

It displays the message, which means that the image is not read,So The question is How can I successfully read and load image note: The image in the same folder of main.cpp file http://pbrd.co/1u2Bmj1

Answer 1

As you said following code showed you that file not exist:

QFile file("image.jpg");
     if(file.exists())
         cout<<"\n exist \n"<<endl;
     else
         cout<<"\n not exist \n"<<endl;

Solution:

First of all, try to set full path to your image. For some reasons Qt search your file in wrong place, so set full path.

For example:

cv::Mat image=cv::imread("G:\\2\\qt.jpg");
QFile file("G:\\2\\qt.jpg");
if(file.exists())
    cout<<"\n exist \n"<<endl;
else
    cout<<"\n not exist \n"<<endl;

Or UNIX style:

cv::Mat image=cv::imread("G:/2/qt.jpg");
QFile file("G:/2/qt.jpg");
if(file.exists())
    qDebug()<<"\n exist \n"<<endl;
else
     qDebug()<<"\n not exist \n"<<endl;