Abstract
A novel digital method to extract the precise parameters of digital reference wave (Rd) from a single off-axis digital hologram is proposed. The method makes the Rd closer to the reference wave (R) used in experiment of hologram acquisition. The spectrum expression of off-axis digital hologram multiplied with a digital reference wave or a digital conjugate reference wave is derived for the study of the spectrum characteristics. It is shown that the parameters of the Rd are related to the size of the selected area in the center of the overlapped spectrogram. When Rd = R, the size of selected overlapped area is minimum. Thus, the parameters of the Rd can be determined by finding the minimum of the selected overlapped area. Some simulation results are given to validate the proposed method.
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