... examples in [4] ).Another robust approach for computing AM-FM estimates based on a quasi-local methodwas developed in [42 44 ] for 1D signals. This methodology was extended to digital images in [5, 45 ]. ... 10(3), 44 8 46 4 (2001). doi:10.1109/83.908521[17] Pattichis, M, Panayi, G, Bovik, A, Shun-Pin, H: Fingerprint Classification using an AM-FM model. IEEE Trans.Image Process. 10(6), 951–9 54 (2001)[18] ... transform, which is used instead of the Hilbert transform [48 , 49 ]. This istermed the monogenic signal in [48 ]. Felsberg and Sommer introduced the following filters in the frequency domain [50]:H1(u1,...