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Multi-image encryption method based on phase template multiplexing in fractional Fourier domain

A fractional Fourier and Fourier domain technology, which is applied in the field of multi-image encryption based on phase template multiplexing in the fractional Fourier domain, can solve the problems of slow convergence speed and small key space, so as to improve the convergence speed, Easy to operate and avoid the effects of crosstalk noise

Inactive Publication Date: 2016-08-17
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to propose a multi-image encryption method based on fractional Fourier domain phase template multiplexing to solve the problems of slow convergence speed and small key space in the prior art

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  • Multi-image encryption method based on phase template multiplexing in fractional Fourier domain
  • Multi-image encryption method based on phase template multiplexing in fractional Fourier domain
  • Multi-image encryption method based on phase template multiplexing in fractional Fourier domain

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] The invention discloses a multi-image encryption method based on fractional Fourier domain phase template multiplexing, including pure phase extraction, phase modulation and fractional Fourier transform.

[0032] Specific steps are as follows:

[0033] Step 1: Pure Phase Extraction. Taking nine gray-scale images of 256×256 pixels as an example, the phase-only function of each gray-scale image is extracted using the fractional Fourier domain phase recovery process.

[0034] The second step: phase modulation. Modulate the nine pure phase functions obtained in the first step to obtain the modulated result G.

[0035] Step 3: Fractional Fourier transform. Implement α on the result G obtained in the second step 1 Order Fractional Fourier Transform to get extract to get the final phase extract The amplitude of the final cipherte...

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Abstract

A multi-image encryption method based on phase template multiplexing in the fractional Fourier domain, including pure phase extraction, phase modulation, and fractional Fourier transform steps. The invention applies the fractional Fourier domain phase recovery process to multi-image encryption, improves the convergence speed of the encryption system, avoids the influence of crosstalk noise, expands the key space, and solves the problems of slow convergence speed and crosstalk noise in the existing encryption method 1. The problem of small key space; the encryption and decryption processes of the present invention can be realized by optical methods, the system is simple, and the operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of virtual optical information encryption, and relates to a multi-image encryption method based on fractional Fourier domain phase template multiplexing. Background technique [0002] Among all kinds of information, since images are easy to copy and require a large number of sending and receiving, the security of transmission and the efficiency of storage have become an important issue in the information field and have attracted widespread attention. In order to process image data more effectively and safely, multi-image encryption based on multiplexing technology came into being. In recent years, since Situ Guohai proposed multi-image encryption using position multiplexing and wavelength division multiplexing based on Gaussian low-pass filtering [1,2] , multi-image encryption based on optical multiplexing technology has received more and more attention. Many phase recovery procedures based on different do...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00H04N1/32
Inventor 隋连升段快快陈涛芦海伟
Owner XIAN UNIV OF TECH