Application of wavelet filtering techniques to Lau interferometric fringe analysis for measurement of small tilt angles

Adaptive phase denoising based on first order local polynomial analysis

“…The spatial filter do the denoising by multiplying different masks [13], averaging based on nonlocal self-similarity [14], carrying on the non-linear local filter [4,15] or using the local polynomial approximation [16,17] to get rid of the noise. The frequency filter removes the noise by using a low pass or high pass filter in the frequency domain [18,9,19]. The regularization method establishes a regularized cost function and restrain the noise by minimizing the cost function [20][21][22].…”