Spherical pure-phase hologram generation method based on spherical self-diffraction model

Abstract

The invention provides a spherical pure-phase hologram generation method based on a spherical self-diffraction model. The method comprises the following steps: firstly, proposing a spherical self-diffraction calculation model, wherein the diffraction process of the model is that an object plane diffraction field is propagated to the same object plane through spherical center diffraction; generating a spherical pure-phase hologram based on a spherical self-diffraction iterative algorithm; and enabling the spherical surface self-diffraction iterative algorithm mainly to depend on object surfaceamplitude to provide iterative amplitude limitation, so that rapid convergence of the iterative algorithm is guaranteed by utilizing energy conservation of the same object surface so as to generate aspherical surface pure phase hologram capable of being reconstructed at high quality. Compared with a traditional iterative algorithm, the reconstructed image of the spherical pure-phase hologram generated by adopting the method is high in quality, and speckle noise of the reconstructed image of the spherical pure-phase hologram is effectively suppressed.

Description

technical field [0001] The invention relates to a holographic display technology, in particular to a method for generating spherical computational holography. Background technique [0002] As an ideal true three-dimensional display technology, holographic display has always received great attention. The spherical computational holography has become a recent research hotspot because of its 360° field of view. However, spherical computational holography has a technical problem that needs to be solved urgently. This problem is that spherical computational holography is inevitably plagued by speckle noise. The reason for speckle noise is that random phase must be added to the object surface, and speckle noise directly causes the degradation of reconstructed image quality, especially the degradation of the reconstructed image quality of spherical pure phase computational holography. The degradation of reconstructed image quality of spherical pure phase CGH restricts the applica...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the degradation of the reconstruction quality of the above-mentioned spherical phase-only computational hologram due to speckle noise, and proposes a spherical phase-only hologram generation method based on a spherical self-diffraction model

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