Study On A New Method To Realize 3D Display Hologram Calculation For Fast Generation

Holographic technology can record all the information of object wave field.This technique can also realize volumetric displaying of the reconstructed image.It simulates the physical processes recorded by optical holographic technology with computer code and generate hologram.Compared with the optical holography,it has advantages as low requirements for environment,high flexibility to modify,storable,etc.By an-al yzing the value of engineering application of the computer generated hologram(CGH)technology,this paper presents a method of true 3D volumetric virtual display of three-dimensional entity based on holographic technique.Two methods are researched to realize CGH producing process:one is based on the Fourier transform,another is based on the Fresnel diffraction transform.We made a comparative analysis against Burch coding,Huang coding and Li coding in terms of the their advantages and disadvantages,and applied Burch coding to the holographic interferometry record and diffractive process of reproduction.We realize the 3D modeling and rapid reconstruction of objects by using 3DMax,Kinect and Skanect,and get a series of two different perspective projection from two orthogonal direction by using Meshlab.On the base of Matlab development environment,the method processes perspective images obtained by Kinect based on iterative Fourier transform and adds random phase and feedback correction factor to increase the convergence rate of the algorithm.On the basic of the principle of CST,we obtain three dimensional Fourier spectrum by collecting sample points of paraboloid of revolution of the the Fourier spectrum.After the process we obtain a smooth wave spectrum thus improving the diffraction efficient trough the calculation.Burch coding is applied to make the hologram plane distribution of complex amplitude transform to non-negative real value function.The reconstructed image of object wave is then processed through inverse Fourier transform,thus the zero order diffraction and twin image can be suppressed.This paper explored the optical holography technology combining with continuous experiment,the best diffracting distance and key factor of diffraction of Fresnel diffraction region is obtained and Fresnel CGH is made.Experiments show that the method of synthesizing computer generated holograms of real-existing 3-D objects can obtain high quality digital reconstructed image.What is more,the program is simpler and runs faster.In this paper a display and producing system of CGH is designed which includes a manufacture parameter input interface and reconstructed image output interface that parameter adjustment and comparison analysis can be achieved.By completing 100 experimental data analysis and running results indicate that the system is feasibility and practicability.