The Application Of Computer-generated Hologram In Encryption

As the branch of optical holography technology-computer-generated holog ram(CGH)technology in the 21st century,the booming CGH technology has b een more and more scholars applied in different domains such as display,imag e transmission,encryption.This article first introduces the CGH technology in domestic and foreign development history in the field of encryption,describes t he coding theory basis of CGH technology,and discusses the coding theory of CGH technology in the field of the encrypted image transmission and dual cha nnel CGH watermarking two different aspects of the application.Based on MATLAB software,this paper simulates the application of CGH in the field of encryption,and verifies the feasibility of CGH coding theory in image transmission and dual channel CGH.In this study,the CGH technique is applied in the field of cryptography in two different aspects,and the application of an encryption field is to use the CGH technique in the encryption transmission of images.Image encryption transmission process is in the process of image transmission,using CGH to encrypt image transmission,specific operation when the image is divided into two parts of different of the two parts,a picture of a complete,is split between the two parts in the part of image coding Fourier transform CGH,another part of the encoded into Fresnel transform CGH,in the process of transmission used two holographic encryption technology,computing is equivalent to do the double insurance,double insurance can effectively improve the difficulty of the information theft in the process of transmission.In accept transmission image receiver,decoding,requires some predefined parameters to transmission of Fourier transform CGH and Fresnel transform CGH success requires rebuilt the transmission of the original image.Another application of cryptography is the use of CGH encryption in dual channel CGH watermarking.As modern society more and more high demand for information capacity,based on the dual channel CGH encoding of halftone watermarking can carry more information,therefore,this study first proposed dual channel CGH halftone watermarking method.The method using the technique of dual channel two after halftone encoding of CGH watermark embedded into the host image synthesis,encoded into CGH,when back to a pair of computing hologram can show two watermark image.