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Authenticated pure phase hologram generation method based on phase optimization and sparse constraint

A phase-optimized, sparse-constrained technology, applied in the field of information security, can solve the time-consuming problems of holograms, and achieve the effects of improving speckle noise, good authentication effect, and high image quality

Active Publication Date: 2021-05-07
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In forward and reverse diffraction calculations, often multiple iterations are required to achieve convergence in the optimization process, and thus high-quality reconstruction of holograms is often time-consuming

Method used

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  • Authenticated pure phase hologram generation method based on phase optimization and sparse constraint
  • Authenticated pure phase hologram generation method based on phase optimization and sparse constraint
  • Authenticated pure phase hologram generation method based on phase optimization and sparse constraint

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Effect test

Embodiment 1

[0033]Example 1: A method for generating a certifiable phase-only hologram based on phase optimization and sparse constraints, such as figure 1 shown, including the following steps:

[0034] S1: Select three images as hidden image, reference image and host image respectively, such as figure 2 as shown, figure 2 The hidden image in is (a), the reference image is (b), and the host image is (c); using the phase optimization method in the first stage ( figure 1 The first stage of optimization) respectively generate phase-only holograms corresponding to the hidden image, reference image and host image under sparse constraints, such as image 3 as shown, image 3 (a) is the phase-only hologram generated from the hidden image; (b) is the phase-only hologram generated from the reference image; (c) is the phase-only hologram generated from the host image (corresponding to figure 1 Hologram1, Hologram2 and Hologram3 in );

[0035] S2: The phase-only holograms corresponding to the...

Embodiment 2

[0036] Embodiment 2: On the basis of Embodiment 1, the specific process of the phase optimization method in the step S1 is as follows:

[0037] (i) Select a phase plate of appropriate size and determine the corresponding blank rectangular window |A 0 |=1, multiplied by a random phase in the range [0, 2π] at the same time Composition of the input light field

[0038] (ii) will input the light field Perform the inverse Fresnel transform to get the function Replace the function a with a constant 1 q The magnitude components in get the function a q ′, to simulate the missing amplitude modulation of the phase-only SLM plane, and then to the function a q ' Carry out Fresnel transformation to get the function And replace the calculated approximate value with the initial amplitude component (constant 1), continue to perform the inverse Fresnel transform after the replacement, and repeat this iterative cycle;

[0039] Among them, the Fresnel transform is expressed by the f...

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Abstract

The invention discloses an authenticated pure phase hologram generation method based on phase optimization and sparse constraint, and the method comprises the following steps: S1, selecting three images as a hidden image, a reference image and a host image, generating pure phase holograms corresponding to the hidden image, the reference image and the host image under the sparse constraint condition through phase optimization; S2, performing secondary phase optimization on the pure phase holograms corresponding to the hidden image and the reference image to obtain optimized pure phase holograms, and embedding phase information of the optimized pure phase holograms of the hidden image and the reference image into the pure phase hologram of the host image and keeping the phase information unchanged, and performing secondary phase optimization on the pure phase hologram of the host image again to obtain a final authenticated pure phase hologram. According to the invention, the hidden image can be effectively encrypted, and a good authentication effect can be obtained.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a method for generating a verifiable phase-only hologram based on phase optimization and sparse constraints. Background technique [0002] In the field of information security, compared with electronic technology, the information security system of optical method has multi-degree-of-freedom or multi-dimensional characteristics in protecting information, such as amplitude, phase, wavelength, polarization, etc. In recent years, achieving information security by optical means has been extensively studied. Such as diffraction imaging, digital holography, integral imaging, etc. In contrast, holography is an attractive display technology because it can provide all object information and has a wide range of applications, including augmented reality displays, neuronal photostimulation, optical notching, parallax correction, and other fields etc. For electroholography, the...

Claims

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Application Information

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IPC IPC(8): G06F21/60
CPCG06F21/602G06F2221/2107
Inventor 汪小刚王雯琦
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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