  In this paper, we analyze and evaluate suitable preconditioning techniques to
improve the performance of the $L^p$-norm phase unwrapping method. We consider
five preconditioning techniques commonly found in the literature, and analyze
their performance with different sizes of wrapped-phase maps. Keywords.- Phase
unwrapping, $L^p$-norm based method, Preconditioning techniques.

Numerical Analysis;Computer Vision and Pattern Recognition;Numerical Analysis