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Optical image encryption scheme based on interference and 4f system

An encryption scheme, optical image technology, applied in the fields of instruments, electrical digital data processing, digital data protection, etc., can solve problems such as leakage of secret information

Inactive Publication Date: 2020-07-07
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, based on this problem, many researchers have proposed a series of problems to solve the secret information leakage of the scheme, such as the scheme based on the three-phase plate, hoping to remove the contour during the mask generation process, see (Appl. Opt. 51, 686– 691 (2012)), although the implementation of this scheme is very compact, if an unauthorized user obtains two of them, the remaining information can still be identified

Method used

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  • Optical image encryption scheme based on interference and 4f system
  • Optical image encryption scheme based on interference and 4f system
  • Optical image encryption scheme based on interference and 4f system

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Embodiment Construction

[0034] In order to better explain the implementation process of the present invention, the operation process will be described in detail below in conjunction with the accompanying drawings.

[0035] figure 1 It is the optical path diagram of the present invention to realize decryption in the optical image encryption scheme based on interference and 4f system. The optical path structure includes 1, 2. Laser, 3, 4. Collimated beam expander system, 5. Phase mask M1, 6. Phase mask M2, 7. Beam splitting prism, 8, 9. CCD receiving unit, 10. Computer . Wherein the distance between the mask plate and the splitter prism is d1, the thickness of the splitter prism is d2, the refractive index is n, the distance from the splitter prism to the Fourier lens 8 is d3, and the focal length of the Fourier lens is f, d1, d2, d3 satisfy , the distance between the Fourier lenses 8 and 9 is 2f, and the receiving unit CCD is placed on the back focus of the Fourier lens 9, which is f away from th...

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Abstract

The invention discloses an optical image encryption scheme based on interference and a 4f system. During encryption, a wave function constructed by a generated random phase and a secret image servingas amplitude is utilized to carry out direct equal modulus decomposition in a spatial domain, the secret image is encrypted into two pure phase mask plates generated through calculation, and encryptedimage information can be obtained only through interference superposition by the 4f system during decryption. According to the optical image encryption scheme, the problem that secret image contoursappear in interference encryption and single mask plate decryption is solved in principle, secret keys of the optical image encryption scheme are phase mask plates having good secrecy, a decryption system is the a 4f system and has the advantages of being simple and rapid in decryption and high in stability, and the system is good in completeness and high in integratability; meanwhile, simulationverifies that the optical image encryption scheme has very high robustness and can be applied to the field of optical image encryption with high requirements on safety and system integration.

Description

technical field [0001] The invention relates to an optical image encryption scheme, in particular to a technology for optical image encryption through a 4f system based on a pure phase optical diffraction element, utilizing light interference superposition. Background technique [0002] Optical encryption technology has been highly valued by the academic circle in recent years, because optical encryption technology has great advantages in two-dimensional image processing. Optical encryption has the advantages of parallel high-speed processing, such as spatial light modulators and lenses, etc., they process all pixels of the image at the same time, while electronic technology can only process pixels one by one; optical encryption has multi-dimensional and With the characteristics of multiple parameters, many optical parameters such as wavelength, polarization direction and phase can be used as security keys, so that the security of the encryption system can be effectively gua...

Claims

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Application Information

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IPC IPC(8): G06F21/60
CPCG06F21/602G06F2221/2107
Inventor 李桂林于韬杨栋宇马锐祝玉鹏孙鑫凯苗栋史祎诗
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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