Abstract
Phase-only holograms could be displayed with a single phase-only SLM free from the zero-order diffraction and the twin image. Addition of random phase to the object light in computer-generated holograms (CGHs) can widely diffuse the object light and to avoid its concentration on the CGH. But it causes speckle noise in the reconstructed image. Speckle reducing methods could be classified as iterative and non-iterative methods. Non-iterative methods are fast and effective, such as random displaced phase distribution (RDPD) and error diffusion (ED). The drawbacks are degradation of the reconstruction at different spatial frequencies. Point spread function (PSF) works as the impulse response of optical reconstruction system. Its Fourier transform, optical transfer function (OTF), gives a set of coefficients for plane waves of various spatial frequencies and orientations. The evaluation of OTF could quickly determine which spatial frequency components are passed or attenuated for the CGH display. The non-iterative methods for speckle noise reduction on reconstructed images in spatial frequency domain is analyzed.
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