Circular harmonic filters of different orders are compared using a criterion of separability between the target and object output probability densities. A holographic computer-generated circular harmonic filter was used to recognize aircraft from an air photograph.
© 1983 Optical Society of America
Yuan-Neng Hsu and Henri H. Arsenault, "Statistical performance of the circular harmonic filter for rotation-invariant pattern recognition," Appl. Opt. 22, 2804-2809 (1983)