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Using temporal phase-unwrapping mask for shape measurement

A new phase unwrapping algorithm is proposed based on temporal phase unwrappping. Given a series of wrapped phase maps generated from different fringe periods, a jump mask (or matrix) was introduced which reveal the 2π phase jump between successive levels. Using this jump mask, a series of wrapped phase can be unwrapped by summing up integers in specific column of the mask. The summation of the integers is the total multiple of 2π phase jump between wrapped and unwrapped phase. Deduction of the mask, practical experiment and discussion are carried out in detail. This method can measure discontinuity in object and accelerates the phase unwrapping procedure.