[Python] How to detect this pattern (if it exists or not) without using any ML / AI?

I am trying to solve this problem where some images have this specific "zebra" like pattern and others not. Here are a few examples that have this pattern:



And here are some exaples that do not have what I am looking for:



The main difference between these 2 groups of images is the vertical pattern going on them. On the first 4 images, the first image exhibits this pattern very clearly but the other 3 images have it more vaguely but still visible when compared to the images that do not have this pattern.

Currently, I do not know how to manipulate this image so that I could get the binary answer (is / isn't) on whether a given image has this "zebra" like pattern or not.

What I have tried is tiling calculating how many times the color changes from white to black looking vertically, but there are cases where this approach does not work.

Could anybody help with this issue?

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