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Digital holographic image encryption and watermarking technology

Author: HeMingZuo
Tutor: CaiLvZhong
School: Shandong University
Course: Optical Engineering
Keywords: Digital holography Image Encryption Phase shifting interferometry Digital Watermarking
CLC: TP309
Type: Master's thesis
Year: 2005
Downloads: 483
Quote: 2
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Abstract


With the rapid development of digital communication and computer network technology, society has entered the information age. IT bring great convenience to the people and also put forward higher requirements for information security. To cryptography based on the conventional digital encryption technology inadequate, and the face of the mass information and the requirements of high-speed processing and an optical information processing speed of light, and having the characteristics of the parallel; lightwave having a high time frequency and corresponding to a short wavelength, can deal with the large amount of information. Therefore, the optical information technology raised new hope for an effective solution to the difficulties currently faced by IT mass of information processing speed limited. Effectively combine the high-speed, large-capacity characteristics of the optical system and the existing theory of cryptography and technologies, the need of optical information, the close integration of cryptography and computer science. Specific application depends on the practical algorithm as well as the development of highly integrated, portable, energy-saving, durable Optronic devices. Based digital holographic optical information processing technology can be successfully simulated using mathematical methods the process of the optical information processing, such as the propagation of light, interference, diffraction and Fourier transform lens and a hologram recording and reconstruction, it has a conversion flexible, implementation The convenient large degree of freedom, has become an important branch of the optical information. The researchers have proposed various digital holographic image encryption method, and the introduction of random phase plate image encryption high security, and a wide range of applications. This paper summarizes a wide range of digital information-based optical image encryption and watermarking technology, and proceed from the practical application of the requirements of the encrypted image transfer process, carried out in-depth study, a series of easy network transmission, a new digital image encryption and watermarks method. This work mainly includes the following aspects: (1) dual phase plate modulation with three-step phase-shifting interferometry combination of image encryption; introduced watermarking technology to further hide the encrypted image. (2) the use of the matching of the random phase plates, to achieve a transfer image with the same set of a plurality of images simultaneously encrypted, it can greatly improve the utilization of the transmission of images. (3) separately to take advantage of the real part of the encryption diffracted field, the imaginary part and phase diagram restore the original image, the comparative study of the system, and found that the phase diagram carry more image information to restore the best. Based on this fact, a pure phase image encryption and watermarking technology, it can significantly reduce the processing and transfer the desired amount of information.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality
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