Digital holography is a powerful technology for a wide range of applications. It combines digital hologram with spatial light modulators (SLMs) and can deliver superior performance which has not been demonstrated before by other technologies. This work proposes a novel method of calculating and optimizing the computer-generated holograms (CGHs) so that a single CGH could be used for white light illumination. The results of this research show that colour dispersion can be reduced by using an iterative algorithm with the aid of a defined perceived image quality, while the shape and sharpness of the target replay fields are maintained.
The present study evaluates the filling factor characteristics of masking phase-only hologram on its corresponding
reconstructed image. A square aperture with different filling factor is added on the phase-only hologram of the target
image, and average cross-section intensity profile of the reconstructed image is obtained and deconvolved with that of
the target image to calculate the point spread function (PSF) of the image. Meanwhile, Lena image is used as the target
image and evaluated by metrics RMSE and SSIM to assess the quality of reconstructed image. The results show that the
PSF of the image agrees with the PSF of the Fourier transform of the mask, and as the filling factor of the mask
decreases, the width of PSF increases and the quality of reconstructed image drops. These characteristics could be used
in practical situations where phase-only hologram is confined or need to be sliced or tiled.
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