Reading images in directory using VideoCapture not working - c++

Question

I am trying to read multiple image files named like 001.jpg, 002.jpg, 003.jpg and onwards by using OpenCV on Linux and displaying them in a window after some delay. Here is my code -
int main(int argc, char ** argv){
cv::VideoCapture cam("/home/bikz05/Desktop/dataset/%03d.jpg");
if (!cam.isOpened())
cout << "Capture is not opened";
cv::Mat image;
const string Window = "Image Number";
namedWindow(Window, CV_WINDOW_NORMAL);
while(true) {
cam >> image;
if (!image.data) {
std::cout << "Preview Ends" << std::endl;
break;
}
cv::imshow(Window, image);
waitKey(1000);
}
return 0;
}
In the first line of the main function, I even tried using
cv::VideoCapture cam("/home/bikz05/Desktop/dataset/001.jpg");
I even tried to place the images in the same folder as the binary, even that didn't help.
In both the cases, it displays only the first image and then the program exits. Note, it doesn't finish.
P.S. - The answers provided on Stack Exchange and opencv.org did not produce the intended result.

Answer 1

The code as you have written has several problems, but if you are going to read images from the disk, use cv::imread() instead of cv::VideoCapture:
std::string filename = "/home/bikz05/Desktop/dataset/001.jpg";
const std::string Window = "Image Number";
cv::namedWindow(Window, CV_WINDOW_NORMAL);
while (true)
{
cv::Mat image = cv::imread(filename.c_str());
if (!image.data)
{
std::cout << "!!! File not found: " << filename << std::endl;
break;
}
cv::imshow(Window, image);
cv::waitKey(1000);
// And before the loop ends, update filename with the next image:
// filename = ???;
}
I haven't tested this, but I'm sure you get the idea.

Answer 2

use glob as in glob(folderpath, vectorOfimages) then access each of the images as vectorOfimages[i].
vectorOfimages is
vector<String>
and folderpath is a String.
I had the same problem and videoCapture does not solve it.