Technical Report Number
This paper describes a method for detecting and segmenting spherical features using the gradient angle transform. An analysis of the gradient angle for ideal spheres is presented, with a discussional of how this may be used to locate the boundaries of the sphere. The algorithms used by a program which detects and segments spherical features are then presented. The results of applying the programs to images with naturally-occurring spherical features are given.
Cox, Kenneth; Roman, Gruia-Catalin; and Ball, William, "Rapid Search for Spherical Objects in Aerial Photographs" Report Number: WUCS-86-15 (1986). All Computer Science and Engineering Research.