Three-step generalized phase-shifting and cascade fractional Fourier transform optical image encryption method

A fractional Fourier, encryption method technology, applied in the field of optical image encryption based on three-step generalized phase-shift digital holography and cascaded fractional Fourier transform, can solve the problems of demanding phase shifters, wavefront reproduction errors, etc.
CN106529311AInactive Publication Date: 2017-03-22TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN UNIV
Publication Date
2017-03-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the technical field of image information security and optical information processing, and provides an optical image encryption method capable of effectively resisting known plaintext attacks and selecting plaintext attacks. The problems of key management and transmission inconvenience are solved. A three-step generalized phase-shifting and cascade fractional Fourier transform optical image encryption method comprises the following concrete steps of (1) a key generation part: two random phase masks achieving the effect of main keys are respectively generated by Duffing chaotic systems controlled by different chaotic parameters; (2) an image encryption part: an image to be encrypted is subjected to Fresnel transform under the irradiation of incident light, and is then modulated by the first chaotic random phase mask; and the modulated image is subjected to fractional Fourier transform with the order being a1 and is then modulated by the second chaotic random phase mask; and (3) an image decryption part: the decrypted image is obtained. The optical image encryption method is mainly applied to image information security and optical information processing occasions.
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Description

technical field

[0001] The invention relates to the technical fields of image information security and optical information processing, in particular to an optical image encryption method based on three-step generalized phase shift digital holography and cascaded fractional Fourier transform. Background technique

[0002] As one of the most popular multimedia forms at present, digital images are widely used in the fields of politics, economy, military affairs, education and so on. In today's highly developed Internet technology, how to protect digital images from tampering, illegal copying and dissemination has important practical significance. The research on image encryption technology has become one of the hotspots in the field of information security.

[0003] Optical information processing technology has aroused great interest in the field of image encryption research because of its high processing speed, high parallelism, and fast realization of convolution and correla...

Claims

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