读取和处理图像（opencv / c ++）

Question

My project is recognizing faces from images. The images have the same name and change occasionally
So i want to load and process the images every time they change
how can i modify this:

    while (image==NULL) {
    image = cvLoadImage("ayman.jpg", 1);
}
cout << endl << "My image was finally loaded!";    

sorry for my english

Answer 1

Ok, let's assume than your images are different at the moment they change (random). How do we detect that it's another image, different from the previous one?

We are going to extract 3 features of your image and it is: the mean of the RED CHANNEL, GREEN CHANNEL and BLUE CHANNEL (it's a vector). So, if the image is the same, the 3 means are the same, but if it's different, the image has been changed.

So think we are in a infinite loop (your while ).

while(true) {
    // we are going to say here if the image has changed or not
}

Are we ok ? So this is the code:

    image = cvLoadImage("ayman.jpg", 1);
    Scalar meanOfImage = mean(image);

    while (true) {
        Scalar meanAtThisMoment = mean(image);
        // This are the three features (it's in real one, but one vector of 3).
        // We are going to compare the three to be more clear.
        if (meanAtThisMoment[0] == meanOfImage[0]
            &&
            meanAtThisMoment[1] == meanOfImage[1]
            &&
            meanAtThisMoment[2] == meanOfImage[2]) {

            cout << endl << "The image hasn't been changed yet.";
            image = cvLoadImage("ayman.jpg", 1); // added!! forgot this, sorry
        } else {

            cout << endl << "The image has been changed!!!";
            // and now we set the meanOfImage (the main mean) of the new image to compare with the future images.

            meanOfImage = meanAtThisMoment;



        }

    }