I have a question regarding measuring a distance with code/an AI model. I’m new to coding and I would like to make a code which can detect the distance between a golfball and the hole on a picture. The picture should be taken with a simple phone camera.

I already have a reliable object detection model which can detect the golf ball and the hole. I also thought of using the average size of a golfball and hole as a scale and solve it as a mathematical problem but I’m pretty sure this approach doesn’t work.