How to retrieve a sequence of images from a folder, such that the images will represent a movement?

edit

if your images are numbered (001.png, 002.png,..), you can use

cv::VideoCapture cap("/path/to/files/%d.png");
while(cap.isOpened()) {
    Mat img;
    if (! cap.read(img)) 
        break; // end of sequence
    cv::imshow("img", img);
    if (cv::waitKey(1000) > 0) // 1000 millis == 1 second
        break;
}

if your images can be sorted lexically (aaa.png, aab.png,..), you can also use:

vector<String> files;
cv::glob( "/path/to/files/*.png", files);
for (size_t i=0; i<files.size(); i++) {
    Mat img = imread(files[i]);
}