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A Method to Eliminate the Defocus Noise of Random Encrypted Optical Scanning Holography

A defocus noise and optical scanning technology, applied in optics, optical components, and key distribution, can solve the problems of rough image edges, large defocus noise, and low timeliness, achieve good axial resolution, and eliminate defocus Noise, ease of operation

Inactive Publication Date: 2019-06-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Description
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  • Application Information

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Problems solved by technology

However, due to the need to average multiple frames, its timeliness is low
[0004] In 2015, Dr.Haiyan Ou proposed a method using frame difference and connected domains to remove defocus noise in the article "Defocus noise suppression with combined frame difference and connected component methods inoptical scanning holography" published in the journal Optics Letters in 2015. , this method has better timeliness, but it still needs two frames, and the edge of the image after removing the defocus noise is not smooth, and it is deformed compared with the original image
[0005] Convex optimization, first of all, is an optimization problem in mathematics, and then it is used in the reconstruction of image compression sensing, and then by Xin Zhang in 2010 in the journal Optics Express "Reconstruction of sectional images in holography using Inverse imaging" is used for the reconstruction of holograms in optical scanning holography, which reduces the defocus noise to a certain extent, but still has a certain amount of defocus noise, and when the axial distance between the two layers of objects is relatively close, the defocus noise will be bigger

Method used

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  • A Method to Eliminate the Defocus Noise of Random Encrypted Optical Scanning Holography

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Embodiment

[0060] The basic structure adopted by the embodiment of the present invention is as figure 1 As shown, the wavelength λ=632.8nm of the He-Ne laser Laser, the focal lengths of the two convex lenses (L1, L2) are both 75mm, and the distance from the scanning mirror to the double-layer slice is z 1 =30mm,z 2 =30.1mm, objects such as figure 2 As shown, the slice size of the object is 2mm×2mm, and the sampling pixels are 512×512.

[0061] The concrete steps of the embodiment of the present invention are as follows:

[0062] Step 1. The laser is emitted by the laser and split by the first polarizing beam splitter BS1. One beam of light is reflected by the first plane mirror M1 and passes through the first pupil; the other beam of light passes through the acousto-optic modulator AOFS and passes through the second plane mirror M2 After reflection, it passes through the second pupil; the first pupil is a random phase plate, and the second pupil is a rectangular 1 function;

[0063]...

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Abstract

The invention provides a method for eliminating defocus noise of random encryption optical scanning holography, belongs to the field of optical encryption and holographic reconstruction, and mainly solves the problem of defocus noise in random encryption optical scanning holography technology. The invention mainly uses convex optimization reconstruction and high-order amplification to eliminate the defocus noise of random encryption optical scanning holography, effectively eliminates the influence of defocus noise of the optical scanning holographic system on holographic reconstruction, and improves the resolution of holographic images.

Description

technical field [0001] The invention relates to the field of optical encryption and holographic reconstruction, in particular to a method for eliminating defocus noise of random encrypted optical scanning holographic defocus. Background technique [0002] Optical Scanning Holography (OSH) is a digital holography technology based on optical heterodyne single-pixel scanning. This technology overcomes the problem of digital holography limited by CCD resolution by scanning 3D objects point by point. The heterodyne technology records the phase information of the object, which solves the problems of the general coaxial holographic zero-order image and twin images. Due to its high resolution and the characteristics of not being affected by zero-order images and twin images, optical scanning holography technology has quickly become a research hotspot at home and abroad, and has been applied in 3D TV, microscope, and remote sensing technology. [0003] In optics, how to transmit inf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08H04B10/50H04B10/60G02B26/10G02B27/28
CPCG02B26/10G02B27/283H04B10/503H04B10/60H04L9/0861H04L9/0869
Inventor 欧海燕吴勇邵维王秉中
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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