In a digital photo, how can I detect if a mountain is obscured by clouds?

Question

The problem

I have a collection of digital photos of a mountain in Japan. However the mountain is often obscured by clouds or fog.

What techniqu

Answer 1

The answer depends on how specific the problem is. If it's the same mountain from the same POV, run and edge detection against a known good image, and use it as a baseline for convolving against edge-detected images from the corpus. If it's only the edge of the mountain that you're interested in, manually remove other features from the baseline.