Title: Connections between transport of intensity equation and two-dimensional phase unwrapping,
Abstract: In a recent publication [Appl. Opt. 55, 2418 (2016)], a method for
two-dimensional phase unwrapping based on the transport of intensity equation
(TIE) was studied. We wish to show that this approach is associated with the
standard least squares phase unwrapping algorithm, but with additional
numerical errors.