Denoising in digital speckle pattern interferometry using wave atoms

FEDERICO, A.; KAUFMANN, G. H.

OPTICS LETTERS

The Optical Society of America

Lugar: Washington, DC; Año: 2007 vol. 32 p. 1232 - 1234

0146-9592

This Letter presents an effective method for speckle noise removal in digital speckle pattern interferometry, which is based on a wave atom thresholding technique. Wave atoms are a variant of 2D wavelet packets with a parabolic scaling relation, which improve the sparse representation of fringe patterns when are compared with traditional expansions. The performance of the denoising method is analyzed using computer-simulated fringes and the obtained results are compared with those produced by a wavelet and a curvelet thresholding techniques. An application of the proposed method to reduce speckle noise in experimental data is also presented.