Channel crosstalk elimination for dynamic color digital holography based on an elementary hologram

Camera channel crosstalk is an inevitable issue in dynamic real-time color digital holography (CDH) detection, significantly influencing the precision of three-dimensional deformation measurements by CDH. We propose a channel crosstalk elimination method for CDH based on a three-wavelength elementary hologram. Different interference angles of R, G, and B lasers are designed, and then the R, G, and B elementary holograms, having different frequencies and having fringes in different directions, are generated and recorded. The intensity components of the R, G, and B holograms are separated and extracted from the Fourier frequency spectra of the color elementary hologram, and then the crosstalk matrix is derived, and crosstalk elimination is achieved. The method has strong resistance to random noise and is not affected by the fringe contrast of the hologram. The effectiveness and practicability of the method were proved by both simulation and experiment.