Method for determining expansion centers and predicting sidelobe levels for circular-harmonic filters

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Abstract
A map corresponding to energy of circular-harmonic components developed about every point of the image plane allows the determination of the expansion center that will yield the best correlation intensity and the best discrimination ability for the circular-harmonic filter. The map also allows the prediction of the location and of the maximum values of sidelobes. This method is much faster than previous methods for finding proper centers, and it yields more information.