Phase-shifting Angle Choice and Phase-shifting Error Elimination in In-line Phase-shifting Digital Holography
同轴相移数字全息中相移角的选取及相移误差的消除

The influence caused by different phase-shifting a ngle of reference wave in recording and the phase-shifting error on the quality of the reconstructed image is investigated in two-step phase-shifting in-line digital holography, and an effective method of eliminating the phase-shifting error is presented, in which the summation of the intensity bit errors of the reconstructed image is taken as an evaluation function for an iterative algorithm to find the exact phase-shifting value. Then the optimal choice of the phase-shifting value of reference wave is simulated by computers. The simulation results show that the reconstructed image noise is weak when the phase-shifting value is in a certain range. At last, the feasibility of the method of eliminating the phase-shifting error is demonstrated by computer simulation also.