Hello everyone, beginner OpenCV student here:

I am trying to overlay 2 images (or binary images) on each other and I need to find the area of the section where both images intersect.

To do this, my approach is simple:

1 - Find contour of the first image, and then find the area of the contour

2 - Find contour of the second image, and then find the area of the contour

3 - Find the contour of the intersection and then find the area.

However, the `area = cv2.contourArea(cnt)`

line of code typically returns `0.0`

as the area and so, I am not able to progress to step 3.

I have searched online and the answers that I keep getting say that the contour is open and because of this, the area is `0.0`

How do I force the contour to close? or is my approach wrong?

The most important thing for me is to be able to find the area of any contour (from any image I plug in)

Here are my output image(s):

Code and source images can be found here