izzo's profile - activity

Hi there.

I need some help understanding OpenCV.

I started to read a book about OpenCV and there was difficult in understanding the codes.

Please if there's anyone can help find C++ tutorials that's related to OpenCV and what should i learn in C++ to start coding with OpenCV.

Many thanks.

Hey there.. Could anyone tell me what's the multiplication sing (*) means ?.. cause am really confused about it.

Regards

What's the meaning of channels ?

I answered but can't accept it, it needs 50 points.

Problem solved.

I re-installed visual studio 2010 without 64 bit compiler, it was a conflict between 32 and 64 bit support compiler, and the code working as charm :)

Thanks all for help.

Problem solved.

I re-installed visual studio 2010 without 64 bit compiler, it was a conflict between 32 and 64 bit support compiler, and the code working as charm :)

Thanks all for help.

Hey SR, i've made sure of the Debug N' Release DLLs there's no mixing between them!

I tried the try catch but it's not helpful, same error as in the image.

Hey there, i am having a problem with debugging a program for loading and displaying an image

I am using visual studio 2010, and i've followed all the steps to include OpenCV libraries into it, i also tried some projects it all works, But when i try this code to be debugged there's an error shows up:

The code :

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

using namespace cv;
using namespace std;

int main( int argc, char** argv )
{
    if( argc != 2)
    {
     cout <<" Usage: display_image ImageToLoadAndDisplay" << endl;
     return -1;
    }

    Mat image;
    image = imread("OpenCV.jpg", CV_LOAD_IMAGE_COLOR);  // Read the file

    if(! image.data )                              // Check for invalid input
    {
        cout <<  "Could not open or find the image" << std::endl ;
        return -1;
    }

    namedWindow( "Display window", CV_WINDOW_AUTOSIZE );// Create a window for display.
    imshow( "Display window", image );                   // Show our image inside it.

    waitKey(0);// Wait for a keystroke in the window
    return 0;
}

The error :

Hey there, i am having a problem with debugging a program for loading and displaying an image

I am using visual studio 2010, and i've followed all the steps to include OpenCV libraries into it, i also tried some projects it all works, But when i try this code to be debugged there's an error shows up:

The code :

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

using namespace cv;
using namespace std;

int main( int argc, char** argv )
{
    if( argc != 2)
    {
     cout <<" Usage: display_image ImageToLoadAndDisplay" << endl;
     return -1;
    }

    Mat image;
    image = imread("OpenCV.jpg", CV_LOAD_IMAGE_COLOR);  // Read the file

    if(! image.data )                              // Check for invalid input
    {
        cout <<  "Could not open or find the image" << std::endl ;
        return -1;
    }

    namedWindow( "Display window", CV_WINDOW_AUTOSIZE );// Create a window for display.
    imshow( "Display window", image );                   // Show our image inside it.

    waitKey(0);// Wait for a keystroke in the window
    return 0;
}

The error :

Thanks a lot SR :)

alright, one more question, when the data type is (CV_8UC3), it's always BGR ?, and what if i want it in reverse (RGB) how could it be possible ?

Hey there, please someone tell me what's the Scalar do in the following code ? and what's the use of it in general ?

Mat M(2,2, CV_8UC3, Scalar(0,0,255));
cout << "M = " << endl << " " << M << endl << endl;

Thanks

Many thanks Bibliarij.

Please someone tells me what's the meaning of component in the following paragraph.

Each of the building components has their own valid domains. This leads to the data type used. How we store a component defines the control we have over its domain.

Thanks, but it differs from BGR to RGB, or it's all the same ?, and in column 0 row 0 all values are zeros what the color will be ?!

The question is the column 0, row 0 represent a pixel ?

Thank you, i get the idea..

Thanks berak, understood :)

Need description of the following code :

    1   Mat A = imread(argv[1], CV_LOAD_IMAGE_COLOR);
    2   Mat F = A.clone();
    3   Mat G;
    4   A.copyTo(G);

The second line, is the header A is copied to F ?

The forth line, is the header A copied to G or vice versa( G copied to A) ?

Please someone help me to understand what's the use of this code step by step, and why do we create just the header parts ?, and what does the copy constructor do and how to use it ?

Mat A, C; //creates just the header parts
A = imread(argv[1], CV_LOAD_IMAGE_COLOR); // here we’ll know the method used (allocate matrix)
Mat B(A); // Use the copy constructor
C = A; // Assignment operator

Thnaks