A method for instantaneous three-dimensional profile measurement of carp tail fin is proposed. The moiré fringes containing the three-dimensional information of a continually swimming carp tail fin
generated by the interference of the grating lines and their shadows
are captured by a high-speed CCD camera. Fourier transform profilometry (FTP) method is adopted to analyze the time-sequence fringe patterns. The phase unwrapping method is used to unwrap the phase in the kinematic process
the instantaneous three-dimensional profile is obtained and the continually moving configurations of tail fin of carp is reconstructed.