Phase retrieval in digital speckle pattern interferometry by application of two-dimensional active

FEDERICO, A.; KAUFMANN, G. H.

APPLIED OPTICS

Optical Society of America

Lugar: Washington; Año: 2006 vol. 45 p. 1909 - 1916

0003-6935

We propose a novel approach to retrieve the phase map coded by a single closed-fringe pattern in digital speckle pattern interferometry, which is based on the estimation of the local sign of the quadrature component. The estimate is obtained by calculating the local orientation of the fringes, which are previously denoised using a weighted smoothing spline method. The procedure of sign estimation is carried out by determining the local abrupt jumps of size pi in the orientation field of the fringes and by segmenting the regions defined by these jumps. The segmentation method is based on the application of 2-D active contours (snakes) which can also estimate absent jumps, i. e. those that cannot be detected from the local orientation of the fringes. The performance of the proposed phase retrieval technique is evaluated on synthetic and experimental fringes, and compared with the results obtained with the spiral phase and the Fourier transforms methods.