Detecting the sky from photos?

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Detecting the sky from photos?

Nicolas Maisonneuve
Hi everyone,
I have a set of panoramic photos of streets with buildings and the sky in
the background.

I have a problem: how to calculate the % of space related to the sky in each
image.
knowing that the sky could be cloudy or sunny.

(taking a point on the top of the picture + segment growing? or threshold
filtering, using the color related aspects?)

Could someone guide me a bit?

Nicolas