An Image Encryption and Decryption Method Based on Phase Recovery Algorithm and Computational Correlation Imaging
A phase recovery and correlation imaging technology, applied in the field of optical information security, can solve the problems of unclear decryption of grayscale images, achieve the effects of convenient transmission and storage, clear decrypted images, and enhanced security
Inactive Publication Date: 2019-04-26
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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However, due to the characteristics of correlative imaging, there is inevitably noise in the decrypted image, especially for grayscale image decryption is extremely unclear
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[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0042] like figure 1 As shown, an image encryption and decryption method based on phase recovery algorithm and computational correlation imaging, the encryption steps are as follows:
[0043] (1) The image f(x,y) to be encrypted is converted into an optional simple binary image t(x,y) by means of an optical 4f system modulated by two random phase plates (we call it a transition image) , the two random phase plates need to be obtained iteratively through the phase recovery algorithm, the specific method is as follows:
[0044] a. Initially select two random phase plates θ(x,y)=exp[i2πθ 0 (x,y)] and As a random phase modulation function in the spatial and frequency domains of an optical 4f system, where θ 0 (x,y) and The value in is a random number uniformly distributed between [0,1], and k=1 is set.
[0045] b. A...
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The invention discloses an image encryption and decryption method based on a phase recovery algorithm and computational correlation imaging, which belongs to the field of optical information security. In the present invention, a secret image is converted into a simple binary image through random phase plate modulation, and then single-pixel detection is performed through random amplitude modulation to obtain ciphertext; the ciphertext and the random amplitude template can be reconstructed The binary image is constructed, and then the secret image is obtained through random phase modulation. In this invention, the binary image reconstructed by correlation imaging is noisy, and needs to be binarized and reconstructed accurately through erosion and expansion algorithms; the random phase plate in the system is calculated and obtained through the phase recovery algorithm, and different secrets Image calculations obtain different random phase plates, so it is essentially a "one-time pad" encryption system with high security; in addition, single-pixel detection can reduce the amount of data in ciphertext, bringing new benefits to its transmission and storage. convenient.
Description
technical field [0001] The invention relates to the field of optical information security, in particular to an image encryption and decryption method based on a phase recovery algorithm and computational correlation imaging. Background technique [0002] In recent years, with the rapid development of computer and network technology, data transmission and exchange have become an important part of people's daily life, how to strengthen the security of these information has thus become the focus of social attention. Information encryption technology based on optical theory and methods is a new generation of information security processing technology gradually developed in recent years, and it is a hot field in the research of optical information processing. Compared with traditional computer encryption technology, optical encryption technology has the advantages of large capacity, multi-dimensional and high-speed parallel data processing capabilities. For now, the research on ...
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IPC IPC(8): G06T1/00
CPCG06T1/0021
Inventor 袁胜刘雪梅杨阳蕊郑辉魏振卓
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER