Holographic speckle noise suppression method based on layered pixel scanning algorithm

Abstract

The invention provides a holographic speckle noise suppression method based on a layered pixel scanning algorithm. The method comprises the following steps: for a 3D object, firstly, extracting intensity and depth information of the 3D object, dividing the 3D object into 2D layers with different depths, and respectively extracting complex amplitude information of different layers by calculating holograms of the 2D layers; secondly, superposing the complex amplitude information of different layers to obtain the complex amplitude information of the 3D object hologram; scanning each pixel of thehologram of the 3D object through a layered pixel scanning algorithm, optimizing complex amplitude information of the hologram, and finally generating a phase hologram of the 3D object; and finally, generating grey-scale maps with different random phases, and loading the grey-scale maps onto the SLM to optimize the reproduced light. When the optimized reproduction light irradiates the phase hologram of the 3D object, a reconstructed image with suppressed speckle noise can be seen on the receiving screen.

Description

[0001] 1. Technical field [0002] The present invention relates to holographic display technology, and more specifically, the present invention relates to a holographic speckle noise suppression method based on layered pixel scanning algorithm. [0003] 2. Background technology [0004] Display technology is developing in the direction of 3D, flexibility, and wearable. Among them, holography can record and restore all the information of the 3D scene as a whole through the principles of interference and diffraction. Therefore, holographic 3D display has gradually become the next-generation display technology that people pay attention to. During the reconstruction of holographic 3D displays, a laser is usually used as a reproduction light source to illuminate the hologram. However, due to the influence of laser coherence, the coherent superposition of adjacent object points in the reconstructed image will produce the phenomenon of uneven intensity distribution, so there is a la...

AI Technical Summary

Problems solved by technology

The implementation system of the complex amplitude modulation method requires other filtering systems and modulation components in addition to the SLM and lens, so the system is usually complex and difficult to operate

In addition, adding other optical elements such as fiber optic light sources, fast scanning micromirrors, graded structure prisms, and rotatable diffractive optical elements can also reduce the coherence of the light source, but these methods will also increase the cost and complexity of the system sex

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