[PhilBot]

Originally Posted by SamCarlberg

FWIW you could also write that as

public static void sortContoursByArea(List<MatOfPoint> contours) {
  Collections.sort(contours, Comparator.comparingDouble(Imgproc::contourArea));
}

That's a really interesting syntax.

Is there a name for what is hapening with "Imgproc::contourArea" ?
I'd like to look up the explanation of how that works...

Clearly it's getting expanded internally into Imgprog.contourArea(contours[n]) for the comparison.... but I don't know how/why.....