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

A fractional Fourier and Fourier domain technology, applied in the field of multi-image encryption based on fractional Fourier domain phase template multiplexing, can solve problems such as slow convergence speed and small key space, and achieve improved convergence speed, Easy operation and simple system effect

Inactive Publication Date: 2014-04-02
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 fractional fourier domain phase template multiplexing
  • Multi-image encryption method based on fractional fourier domain phase template multiplexing
  • Multi-image encryption method based on fractional fourier domain phase template multiplexing

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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 fractional fourier domain phase template multiplexing comprises the steps of pure phase extraction, phase modulation and fractional fourier transform. The method applies a fractional fourier domain phase recovery procedure to multi-image encryption, increases a convergence rate of an encryption system, avoids crosstalk noise influence, enlarges a key space, and solves the problems of low convergence rate, crosstalk noise presence and small key space of the existing encryption method, an encryption procedure and a decryption procedure can be realized by an optical method, a system is simple, and the method is convenient to operate.

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