Evaluating the phase from a single fringe pattern is not a simple task
because of the numerous possible ambiguities. Although good skeletons
can be extracted automatically from noisy interferograms, the numberi
ng of the fringes is still a time-consuming manual task. Using a graph
formulation of the problem, it is possible to automatize the consiste
nt labelling of the fringes in the case of a continuous phase field. T
he remaining ambiguous points can then be determined in an arbitrary o
r interactive way.