Phase unwrapping guided by amplitude of wavelet ridge coefficients in wavelet transform profilometry

In order to limit the error transfer in wavelet transform profilometry, we propose an idea that the amplitude values of wavelet transform coefficients at wavelet-ridge position, which has been ignored before, can be used to guide the phase unwrapping .It means that the wrapped phase located at the pixel with highest amplitude value will be selected as the starting point of the phase unwrapping, and then the pixel with higher amplitude value will be unwrapped earlier. So the path of phase unwrapping is always along the direction from the pixel with higher amplitude value to the one with lower amplitude value. Because of making full use of the amplitude information of wavelet coefficients at wavelet-ridge position, the error transfer is limited within local minimum areas during the process of phase unwrapping .Computer simulation and experimental result verify the proposed idea.