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?