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Image Encryption Method Based on Double Random Phase Encoding and Interference Principle

A technology of double random phase and encryption method, which is applied in the field of image encryption, can solve the problem of contour appearance and other problems, and achieve the effects of improving security, overcoming contour appearance, and high system flexibility

Active Publication Date: 2015-09-16
JIAXING NIYA OPTOELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, studies have shown that the method of directly using double random phase encoding technology for image hiding also has a "contour appearance problem", that is, as long as one or two phase plates are placed in the decryption system, the contour information of the original image can be obtained

Method used

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  • Image Encryption Method Based on Double Random Phase Encoding and Interference Principle
  • Image Encryption Method Based on Double Random Phase Encoding and Interference Principle
  • Image Encryption Method Based on Double Random Phase Encoding and Interference Principle

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Embodiment Construction

[0033] The specific implementation of method of the present invention is as follows:

[0034] (1) The encryption process of the image (such as figure 1 shown) in the following steps:

[0035] (i) f(x, y) is the original image to be encrypted, h(x, y) is an image used to generate a false contour, R(x, y) is a random phase plate, R(x, y ) is mathematically expressed as exp[2πm(x, y)], where m(x, y) represents a random matrix with a uniform probability distribution on the interval [0, 1], using h(x, y) and R (x,y) to get a phase plate with false contour information: P 1 (u,v)=PR{FT[h(x,y)R(x,y)]}.

[0036](ii) Encrypt f(x, y) using the classic double random phase encoding technology based on the 4f system, and the two phase plates on the input plane and the Fourier spectrum plane are R(x, y) and P 1 * (u, υ), the encryption result is expressed as E(x, y)=IFT[FT[f(x, y)R(x, y)]×P 1 * (u,v)].

[0037] (iii) Use θ(x, y) and A(x, y) to represent the phase distribution and amp...

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Abstract

The invention discloses an image encryption method based on double random phase encoding and an interference principle. The image encryption method based on the double random phase encoding and the interference principle comprises the following steps of encryption and decryption. In the encryption step, two images are respectively used as a to-be-encrypted image and an image of a phase plate with false contouring information, the to-be-encrypted image is encrypted by applying the phase plate with the false contouring information and a random phase plate, an encryption result is decomposed into two phase plates by utilizing the interference principle, and random permutation of elements between the two phase plates is realized by a numerical method. In the decryption step, Fourier transformation is performed after two phase plates finally obtained by the encryption are superposed, inverse Fourier transformation is performed after a Fourier transformation result is multiplied by the phase plate with the false contouring information, and the amplitude of the phase plate is extracted to obtain an original image. The method disclosed by the invention is used for the encryption and the decryption of the images. The phase plates obtained by the encryption do not have the outline show problem of the original image. The false contouring information is introduced into the method, so that not only is an effect of misleading attackers exerted but also a basis is provided for legal decoders to select the phase plate on a frequency spectrum surface.

Description

【Technical field】 [0001] The invention relates to the technical field of information security and the field of information optics, in particular to an image encryption method. 【Background technique】 [0002] The application research of dual random phase encoding technology and optical interference theory in image encryption is a hot topic in the field of optical information security research in recent years. In 1995, two American experts, P.Réfrégier and B.Javidi, proposed the dual random phase encoding technology, which is an important application of optical theory in the field of information security. This technology has been protected by a US patent. However, due to the linear nature of the system, there are great hidden dangers in the security of the system. The research on image encryption methods based on optical interference theory is a new hotspot in the field of optical image security in recent years. This kind of method has the characteristics of simple encryptio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 汪小刚周国泉徐一清
Owner JIAXING NIYA OPTOELECTRONICS CO LTD
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