A Novel Algorithm for Phase Unwrapping Based on Sign Line

The three-dimensional measurement based on fringe projection technology is a significant method for acquiring objects´ shape information and one of its key problems is to get the phase variety. To solve the complex computation and poor precision problems occurring in the phase unwrapping, a new algorithm consisted of temporal and spatial phase unwrapping methods is proposed. By obtaining the distribution of the fringe order from an assistant image, this new algorithm can distinguish the defective area and eliminate the error extension phenomenon deriving from the scan-line method. Experiments show that this algorithm, which could get better precision and save the time, works well in three-dimensional measurement.