Research On Holographic Display Verification System Based On Integrated Imaging

In the modern information society,people are more and more interested and concerned about the field of three dimensional(3D),and the traditional two-dimensional display technology has been more and more difficult to meet the needs of various fields.In the past few decades,different kinds of 3D display technologies have been widely studied and applied.From assist with 3D display to naked eye 3D display,the pursuit of how to achieve high resolution,large perspective,real-time dynamic color 3D display has become the goal of commercial and researchers.The techniques of integrated imaging(incoherent light,synthetic aperture,view intensity coding)and holography(coherent light,mirror-less,complex wave field interference fringe coding)have become the representative technologies in the field of 3D display.These two 3D display methods have their own advantages and disadvantages,so the combination of the two technologies will become a research hotspot in this field.This thesis tries to combine the technical characteristics of integrated imaging and holographic display,using the designed computer holographic software as an auxiliary tool,mainly studies the verification system of holographic display based on integrated imaging.The specific research contents are as follows:(1)The computer hologram software was developed based on MATLAB,which was used to encode the images obtained based on the integrated imaging and generate various holograms needed for subsequent experiments.First,3Ds Max was used to build a 3D model and place a virtual camera array to collect parallax images.Then,the computer holographic software is used to generate the parallax composite graph and the composite hologram,which will provide assistance for the subsequent research on the 3D display system based on the column lens grating.Finally,the computer hologram software not only helps in the research of 3D display system,but also extends the basic optical experiment part in order to further improve the practicability of the software,which can be used for scientific research and classroom teaching.(2)A one-dimensional integrated imaging system based on cylindrical lens grating was studied.A 3D display platform combining liquid crystal display(LCD),cylindrical lens grating and holographic function screen is built.Firstly,the principle of the columnar lens grating and the relationship between the parameters of the columnar lens grating(lines per inch(LPI),thickness)are analyzed,the pixel matching problem between the columnar lens grating and the display screen is solved.Then,the coding problem of parallax image array is studied.Finally,a stereo display platform is built to verify that different images can be seen from different angles.(3)A projection binocular holographic 3D display system is proposed.It is composed of a holographic projection device based on a pure phase spatial light modulator and a cylindrical lens grating,principle will be integrated imaging principle combined with holographic display technology,using the holographic projection device instead of traditional projection projector in integrated imaging system,even if the loaded into the pure phase SLM synthetic hologram is incomplete,still can reconstruct the whole image.In addition,the processing of element image is simplified in the verification system,and the hologram is obtained by iterative computation of the parallax composite image directly.Firstly,this thesis puts forward three kinds of holographic display verification system,depending on the type of the generated hologram,mainly divided into Fourier hologram display system and then Fresnel holographic display system,parameter analysis of the three kinds of system in detail,calculate the reconstruction of the image pixels and the specific position,by the image parameters(number,size,location)grating parameters with cylindrical lens(LPI,thickness)mutual constraint relationship,determine the cylindrical lens grating specifications and need the number of viewpoints.Finally,a projection binocular holographic 3D display platform was built.By establishing different 3D models,different images could be seen at different viewpoints,and the preliminary verification of the system was completed.