Question

I’m looking for a solution to display successive frames in one window using OpenCV. I have a sequence of images (001.jpg, 002.jpg, 003.jpg, etc.), but not a video. I have to display them within a loop.

The standard code to display an image is:

IplImage* src = cvLoadImage("001.jpg");
cvNamedWindow("My pic"); 
cvShowImage("My pic",src); 
cvWaitKey();

Answer 1

As Link suggests, one option would be to write a function that automatically generates the correct filename, for example:

void loadImage(IplImage *image, int number)
{
    // Store path to directory
    char filename[100];
    strcpy(filename, "/path/to/files");

    // Convert integer to char    
    char frameNo[10];
    sprintf(frame, "%03i", number);

    // Combine to generate path
    strcat(filename, frameNo);
    strcat(filename, ".bmp");

    // Use path to load image
    image = cvLoadImage(filename);
}

This could then be used in a loop for a known number of images

IplImage *im;
for (int i = 0; i < nImages; ++i)
{
    loadImage(im, i);

    /*
        Do stuff with im
    */
}

An alternative option would be to investigate the boost directory iterator.