I would like to detect whether the earth limb (the curvature of the earth from space) is in an image taken from space. An example image is :[C:\fakepath\SmallISS043-E-3097.jpg](/upfiles/14834815353545787.jpg)
I could use edge detection to get the earth limb, and get the contour line, but how can I determine if the contour line is the curvature of the earth?
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