A Holographic Speckle Noise Suppression Method Based on Hierarchical Pixel Scanning Algorithm
A scanning algorithm and speckle noise technology, applied in the field of holographic display, can solve the problems of reducing the coherence of the light source, difficult to operate, and complex system.
Active Publication Date: 2021-01-01
BEIHANG UNIV
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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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[0022] An embodiment of a method for suppressing holographic speckle noise based on a layered pixel scanning algorithm proposed by the present invention will be described in detail below to further describe the present invention. It is necessary to point out that the following examples are only used for further description of the present invention, and cannot be interpreted as limiting the protection scope of the present invention. Those skilled in the art make some non-essential improvements and improvements to the present invention according to the above-mentioned content of the invention. Adjustment still belongs to the protection scope of the present invention.
[0023] An embodiment of the present invention is: in the experiment, a green laser is used as the reproduction light, and its wavelength is 532nm. Two SLMs of the same model are used, the first SLM is used to load the random phase grayscale image, and the second SLM is used to load the hologram of the 3D object. T...
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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...
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IPC IPC(8): G03H1/32G03H1/22
CPCG03H1/2294G03H1/32G03H2001/2297
Inventor 王迪王琼华刘超李移隆李楠楠
Owner BEIHANG UNIV