A fast quality-guided flood-fill phase unwrapping algorithm is proposed for real-time 3D Fringe Pattern Profilometry
(FPP) system. The proposed approach consists of three steps. First, based on the phase maps acquired by phase shift
profilometry (PSP) techniques, a quality map is generated according to the phase variance adjacent pixels on the
wrapped phase map. According to the quality map, the phase map is divided into several parts which are categorised as
either rapid phase changing areas or smooth phase changing areas. Then quality-guided flood-fill phase unwrapping
algorithm is applied to rapid phase changing areas and non-guided path-following algorithm is used in the smooth phase
changing area. The proposed approach is much faster than the conventional non-guided path-following algorithm, and it
is more robust than the non-guided path-following algorithm. Experiments are carried out to verify the performance.
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