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Detecting earth limb

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

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?

Detecting earth limb

C:\fakepath\limb_edge_fl28_iss3628.jpg 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

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?

Detecting earth limb

The original image is : C:\fakepath\limb_edge_fl28_iss3628.jpg

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

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?