An optical multi-image authentication method based on a gyratory domain phase recovery algorithm
A technology of phase recovery and authentication method, which is applied in the field of optical multi-image authentication based on slew domain phase recovery algorithm, which can solve the problems of authentication system security disclosure, inability to eliminate crosstalk noise, and complex encryption results.
Pending Publication Date: 2019-01-11
XIAN UNIV OF TECH
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[0004] The encryption result of the existing multi-image authentication system is complex, and the influence of crosstalk noise cannot be eliminated, and the security of the authentication system is revealed
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[0069] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0070] An optical multi-image authentication method based on a rotary domain phase recovery algorithm of the present invention comprises the following steps:
[0071] f(x, y) represents the grayscale plane image of w×h pixels, g(x, y) represents the random amplitude mask generated in the range of [0, 1]; φ(x, y), ξ(u, v) and η(u,v) denote the three phases generated during the iterative recovery algorithm;
[0072] Step 1. Convert the plane image f k (x, y) is encrypted into a phase mask using the phase recovery algorithm, where f k (x,y) represents k images, k=1,2,...,N, such as figure 1 ;
[0073] Step 1.1. Carry out g(x,y) rotary transformation with an angle of -α, and the amplitude and phase expressions after the rotary transformation are respectively:
[0074] g / (u,v)=|G -α {g(x,y)}| (1);
[0075] η(u,v)=arg{G -α {g(x,y)}} (2);...
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The invention discloses an optical multi-image authentication method based on a gyratory domain phase recovery algorithm, comprising the following steps: 1, encrypting a plane image fk (x, y) by usinga phase recovery algorithm to obtain a corresponding phase mask, wherein fk (x, y) represents a kth image, k=1, 2, K, N; 2, processing each phase mask to obtain a complicated phase mask Sk(u, v), andthen utilizing that complex phase mask Sk(u, v) to extract and obtain a sparse cryptographic distribution mask and a binary mask Mk (u, v), and then synthesizing the ciphertext from the sparse cryptographic distribution mask, and combining the binary value mask Mk (u, v) and generating a decryption key corresponding to the plane image fk (x, y) respectively; 3, obtaining a decrypted image by using ciphertext and corresponding decryption key respectively, authenticating multiple decrypted image through optical nonlinear correlation NCk (x, y), and obtaining authentication results. The original image is encrypted into a phase mask by a phase recovery algorithm, which converges quickly and has good performance of mean square error.
Description
technical field [0001] The invention belongs to the technical field of optical information encryption methods, and relates to an optical multi-image authentication method based on a rotary domain phase recovery algorithm. Background technique [0002] Due to the inherent advantages of multi-parameter and parallel processing capabilities, many information processing methods based on different optical techniques such as dual random phase encoding (DRPE), integral imaging, diffraction imaging, photon counting imaging, ghost imaging, polarized light encoding, joint transformation Correlators, interferometers, compressed sensing, and stacked imaging have been extensively studied in the field of information security in recent decades. As an important pioneering work carried out by Refregier and Javidi, DRPE can realize the encryption of plain images into ciphertext with fixed white noise distribution, using two random phase masks located in the input of the correlator and in the F...
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IPC IPC(8): G06T9/00
CPCG06T9/007
Inventor 隋连升张笑
Owner XIAN UNIV OF TECH