Optical Information Processing Technology Of Information Hiding And Digital Watermarking

The aim in this thesis is to discuss the relevent questions of information hiding method and digital watermarking in optical information processing techniques.A twodimensional phase-key was generated by the improved G-S iterative algorithm.A phasekey type Fourier CGH digital watermarking method for blind detection was reported;A digital watermarking system that aim at the color image Print-and-Scan Process is presented. In the system a new color space and an extract program was used for Print-and-Scan Process;Angular multiplexing technique and Fourier CGH digital watermarking was combined that can achieved multiple re-encryption.The content of the watermark include color image and coded text file.For different watermark contents,we designed different optical configuration.Computer simulations are given to prove the possibility of the proposed idea.The emphases in this thesis are summarized as following.1.A two-dimensional phase-key was generated by the improved G-S iterative algorithm. In the frequency domain instead of restrict the amplitude and phase,we only restrict the content of the frequency domain.The feature of the phase mask is:the space domain is a kionform and the frequency domain is constituted by a series ofδfunction2.A phase-key type Fourier CGH digital watermarking method for blind detection was reported in this paper.A two-dimensional phase-key that generated by the improved G-S iterative algorithm was added in the reference waves,which was using to generate the CGH of the mark image.Theoretic analysis and the computer simulations shows that because the spectrum of the phase-key is composed of a series of functions that have different Parameters,The spectrum of the host image and the conjugate image was separated from the mark image in the extract process,So we can improve the quality of the retrieved mark image and the security capability with blind detection. 3.Based on Fourier CGH technique,a digital watermarking system that aim at the color image Print-and-Scan Process is presented.In the system,we first proposed that apply the Fourier CGH digital watermarking technique in Color Image Forgery Prevention Printing.And we also designed an extract program in the system.Compared with other digital watermarking system that aim at print-scan process,The System has the following characters:large information capacity,blind detection. Moreover,the hidden information also survive cropping and scaling attacks.The system can be applied to the color image Forgery Prevention Printing.4.Angular multiplexing technique and Fourier CGH digital watermarking was combined that can achieved multiple re-encryption.The content of the watermark include color image and coded text file.5.For different watermark contents,we designed different optical Configuration.Computer simulations are given to prove the possibility of the proposed idea.