Integral Imaging-based Three-Dimensional Data Encryption And Data Hiding

Integral imaging is a promising technology for sensing,imaging,and displaying three dimensional(3D)images with full parallax and continuous viewpoint,the proportion of3 D data generated by integral imaging technology is steadily and rapidly increasing,if they are repeatedly copied and pirated,the rights of copyright holder would be at risk.This creates a pressing need for 3D data encryption,information hiding and digital watermarking system that can unambiguously identify the copyright holder causing various copyright protection techniques to actively developing at present.In this dissertation,an overview of literature on optical information security,3D information hiding and digital watermarking is presented,and Integral imaging-based 3D data encryption and digital watermarking are investigated.The main contributions are as follows:We studied on the mechanism for integral imaging-based 3D data.These contents are studied such as the principle of integral imaging,computational reconstruction algorithm and so on.The dissertation analyzes emphatically on the mechanism for elemental image array,the relationship between system parameters and performance indicators,the reasons and improved methods for the phenomenon which degraded the quality of the 3D images.It is an important direction of choosing the 3D objects as secret information or original cover,and of seeking safer,more efficient,more convenient technologies that can protect3 D data.And the work meets the practical requirements and the technical development law.The significance of information security for 3D new media is stated specifically.3D digital watermarking based on discrete wavelet transform(DWT)and integral imaging is detailed in this dissertation.3D digital watermarking and cover image are generated by computational integral imaging system that is implemented with smart pseudoscopic-to-orthoscopic conversion(SPOC)model.DWT algorithm is applied to embed and extract the 3D digital watermarking.3D digital watermarking is identified and showed by integral imaging system.The feasibility and effectiveness of the proposed method are demonstrated by experiment.The 3D digital watermarking is not only able to meet the requirements of imperceptible,security and robustness,but image quality and display quality could also achieve these criterions of the human visual model.The proposed method opens up a new research perspective for the copyright protection of 3D digital multimedia products.However,the scheme has a low processing efficiency,limited capacity of the embedded watermark information.This dissertation presents a 3D digital watermarking system by jointing discrete Fresnel diffraction(DFD)transform and integral imaging.3D digital watermarking is generated by computational integral imaging system that is implemented with SPOC model.DFD and random phase mask plate(RPMP)are applied to embed and extract the3 D digital watermarking.3D digital watermarking is identified and showed by integral imaging system.The feasibility and effectiveness of the proposed technology is demonstrated by experiment,the new system is able to meet the requirements of real-time,robustness and security.Capacity of the embedded watermark information is significantly increased.It would be faced with low computational effectiveness,highly complex algorithm,the limited capacity of the embedded watermark information and other difficulties if the traditional two-dimensional(2D)digital watermarking algorithm is used for 3D digital watermarking system.The research can be applied to information security and secret communication which are needed for information security protection of3 D new media.They could be applied as multi-lock and multi-key by the propagation of light and geometric parameters of optical system architecture and others,so that it can achieve high security classification of data encryption,and enhance the security of information hiding and 3D digital watermarking.This dissertation proposes a 3D optical image cryptosystem in Fresnel domain.In the Fresnel domain,3D data is encrypted and decrypted by computational integral imaging system that is implemented with SPOC model and random phase mask(RPM)coding.Many factors can be used as the secret keys in the new system such as these parameters of integral imaging system,the wavelength of the incident light,the lens focal length and so on.The dimension of secret key is increased,as well as the space of secret key is expanded.The security and immunity to attack of the new system are enhanced.The relationship between key parameters and security artribute is discussed.This dissertation proposes a 3D integral imaging reversible data hiding(IIRDH)system.It had researched on the technical principles,implementation algorithm and steps of IIRDH system and introduced them in detail.Finally,the simulation experiment was done with MATLAB 2011(b).The results prove that the data embedding rate can be increased to 1,which is higher than that of the existing methods by about 60%.Besides,the image decryption quality is quite high.It also further analyzes influence of change in key space element on image decryption quality.The system boosts the advantages of high data embedding rate,computation efficiency,security level and real-time capability,andthus can meet the performance requirements of reversible data hiding.The current state of the arts,it is the first scheme on jointing the integral imaging and reversible data hiding in ciphertext domain.This dissertation proposes the integral imaging cryptosystem and optical technical methods.They are adopt the physical background of scalar diffraction theory of light wave,and the analysis by means of Fourier optics,computational optical information processing,computational optical sensing and imaging,integral imaging,optical image encryption,information hiding and digital watermarking,and so on.The research methods can be used in such fields as three-dimensional new media information hiding and multimedia information security.These research results can make full use of advantages of optical technologies.In addition,this paper also provides a powerful new example for optical information security theory.In the future work,we'll research characteristics of three-dimensional image encryption system from the perspectives of cryptanalysis and information theory,and then improve strategies for the system security.To the best of our knowledge,three-dimensional multimedia information security is developing forward from scientific theoretical research to engineering technology in spite of many challenges.