Two-Step Quadrature Phase-shifting Interferometry-Based Optical Image Encryption Technology Research

After decades of sustained and stable development of China’s economic and social development at a higher level of information construction is a critical stage in the leap, information technology and information industry is facing a variety of opportunities and challenges. The rapid economic development must be accompanied by a large number of important information storage, transmission, and optical information security has become a significant issue.Optical information processing by computer image processing, optical information security technology, combining the development of a new cross-disciplinary, with the use of the depth of the random phase plate optical image encryption method, optical image encryption is more show than the previous electronic encryption methods The special strengths:high parallelism, very fast processing speed, huge capacity, good security, great key space, multi encrypted dimensions and other unique advantages, optical image processing technology used in optical information security, the optical information hiding technology and optical image encryption processing has made large progress. All this led to the strong interest of many researchers around the world, but has also become an important research in the field of optics. The optical information security is still in the preliminary exploration of the initial infancy, there are still some important issues and key technologies to be resolved.Still not ideal to send and custody of the encryption map and key, optical image processing is still not systematic; a lot of work has been completed yet still in a period of laboratory research, and practical, there is a gap; the size of the optical system too large, the security of image encryption is still to be improved. Especially the double random phase image encryption method, despite high ability to prevent encrypted information is compromised, the random phase plate production process is quite complex and difficult, because the random phase itself is not the law, so random phase plate can not be recycled, in case of lost or damaged, you decrypt the encrypted image can not do the right above these issues affect the practical application of the method within a certain range. Optical processing system,in general is difficult to achieve. The optical field of information security is still much room for development, the subject of the theory of value and value.And the currently developed, the majority of optical image encryption and decryption system is geometrically symmetric, the system of optical information processing is linear, it’s this feature will directly affect the security system for optical image encryption. Continue to explore, find have a higher safety performance can be convenient to a variety of practical application of image encryption approach is to focus on the content of this field for future research, extensive research and step by step to solve these problems, continue to develop and improve the already optical information security technology, has significant academic value and practical significance.This paper summarizes a variety of optical image encryption based on information optics Research Overview summarizes a variety of image encryption scheme appeared so far, analysis of the phase-shifting interferometry principle have a variety of phase-shifting interferometry, and the practical application of encrypted image in the process of requirements to proceed, in-depth study, a series of easy to realize image encryption method. In this paper, the content and structure arrangements include the following aspects:The first part of the optical encryption technology overview introduction, after the analysis of some typical optical encryption scheme so far appeared, general methods of analysis of its work on a variety of encryption technology.The second part of the first phase-shifting interferometry principle of holographic technology and the phase shift method, and then lists a variety of existing phase-shift interferometry, after there have been some use of phase shifting interferometry for image encryption technology.The third part of the amplitude image encryption and decryption, the principle of using this technology, through the Fresnel diffraction, the two-phase plate modulation and two-step quadrature phase-shift interferometry combined with the experimental analysis.After the phase image encryption and decryption, the principle of this technique, Fresnel diffraction, the modulation of two-phase plate and two-step quadrature phase-shift interferometry combined with the simulation analysisPart Ⅳ:amplitude image encryption and decryption, analysis of the principle of this technology by the fractional Fourier transform, the modulation of two-phase plate and two-step quadrature phase-shifting interferometry combined with, and has done a simulation analysis.Analysis of the phase image encryption and decryption, the principle of using this technology by the fractional Fourier transform, the modulation of two-phase plate and two-step quadrature phase-shifting interferometry combined with, and has done a simulation analysis.