Application of the bidimensional empirical mode decomposition and the Hilbert transform for fringe pattern normalization

MARÍA BELÉN BERNINI; ALEJANDRO FEDERICO; GUILLERMO H. KAUFMANN

Rosario, Santa Fe, Argentina

Congreso; RPIC 2009, XII Reunión de Trabajo en Procesamiento de la Información y Control; 2009

Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Universidad Nacional de Rosario

This paper presents a new fringe pattern technique to perform background suppression and modulation normalization. The proposed technique uses the Bidimensional Empirical Mode Decomposition (BEMD) method and the partial Hilbert transform (PHT) to decompose fringe patterns in their frequency modes, and finds the amplitudes of each mode in order to perform thenormalization. The technique was tested using computer simulated fringe patterns with different fringe density and embedded modulation defects. In addition, the fringe patterns were generated with regions with very low modulation or stepped contrast changes so as to test the normalization procedure in cases where other techniques have a poor performance.