Optical Image Encryption And Watermarking Technology Research

With the rapid development of computer multimedia technology and Internet technology,the society into the information age,especially in recent years,the widespread popularity of mobile phone and WIFI,people can through the network at any time and place for audio,video and image data,great place to show the life of people,the subsequent information security problem is increasingly outstanding.Image encryption is an important branch of information security.Faced with a lot of information and high speed processing,traditional image encryption technology can not be satisfied.Optical information processing is characterized by the speed of light processing,parallelism,more freedom(phase,amplitude,wavelength,polarization state of light)and so on.Moreover,the light wave has a high time frequency and corresponding short wavelength,which can handle large volume data,which makes optical encryption play a very important role in the image security system.With the rapid development of network information technology and electronic commerce,the research of watermarking technology is of great significance.In today's society,digital products emerge in endlessly,digital works(such as images,audio,video and files)are mixed.The copyright protection of digital information and the authenticity of information will be paid more and more attention to.Digital watermarking technology emerges as the times require.It plays an important role in the protection of digital rights and the maintenance of data security.The extensive concern of scholars in the field of computer and information processing.The main work of this paper includes several parts.1.Based on the research of optical encryption theory,the typical optical encryption system is analyzed,and the image encryption and decryption algorithm is designed and given.The purpose of imageencryption and decryption is realized by MATLAB software simulation.2.The digital watermarking technology is studied.According to the basic principle of digital watermarking,the process of embedding and extracting digital watermarking is analyzed in detail,which lays a foundation for the research of image digital watermarking technology.3.The digital holographic watermarking technology is studied,and the recording and reproducing process of Fourier transform hologram and Fresnel transform hologram are expounded.The digital holographic watermark is made by computer simulation experiment.As the watermark image is embedded into the host image,the information of the watermark is greatly improved.A watermarking embedding algorithm based on digital holography is proposed,and the watermark is extracted successfully.It is proved that the algorithm has good security and robustness.