Abstract: An improved phase unwrapping algorithm was proposed to sovle the problem of phase jumping and timeconsuming in phase unwrapping of complex wrapping phase image. Firstly, the wrapped phase image was obtained by fourstep phase shift method, and the quality map was generated from the wrapped phase image. Secondly, the quality map was divided into high quality area and low quality area, the high quality area was unwrapped by simple path algorithm, and the low quality area was constructed the horizontal and vertical weighted edges by the quality values of two adjacent pixels. Finally, phase unwrapping was performed according to the constructed edge weights from small to large. The unwrapping process took the edges of two pixel points as unit. Discontinuous unwrapping paths were used to unwrap all the pixels one by one. The experimental results show that compared with other algorithms, the proposed algorithm has faster unwrapping speed and better effect of unwrapping.

Key words: measurement, phase measurement, phase unwrapping, structured light, path guidance