Study Of Optical Pick-up System On Integral Imaging Three-Dimensional Display Technology

Integral imaging, as a3D imaging and display technology for picking-up anddisplaying the3D information, has become a research hotspot in three-dimensionaldisplay field recently. In integral imaging technology, the quality of the reconstructedimages in the display system is directly influenced by the quality of the elementalimages in the optical pick-up system. Therefore, the study of the optical pick-upsystem is essential for the integral imaging technology. With years of development,the optical pick-up system is continually being optimized, and the quality of theelemental images is enhanced. However, many problems still exist in the existing lensarray pick-up system and camera array system: lower resolution of elemental images,incompleted recording of3D information and detail information lost; especially it isnot available for the applications of large-screen display and real-time pick-up anddisplay.To solve the problems mentioned above. This thesis analyzed the integralimaging optical pick-up system by ray tracing method. On this basis, the parametersof lens array and camera array pick-up system were designed and optimized.Combined with the virtual viewpoint generation technology, by using camera arraypick-up system, the methods to generate the elemental images for the large-screendisplay and real-time display were proposed. The main contents and innovativeachievements of this thesis are shown as follows:1. The principle of the pick-up and display system of integral imaging isanalyzed by ray tracing method. A method was proposed to characterize the imagingefficiency of the lens array in3D information pick-up process. Moreover, thecorrelation of homologous points in elemental images was derived.2. The effect of object size and pick-up distance on imaging efficiency of thelens array was analyzed in the lens array pick-up process. A method was proposed tooptimize the pick-up distance of the lens array. Optical experiments verified the proposed method which could reduce the overlap between the elemental images andthe crosstalk of the reconstructed three-dimensional images. Furthermore, thereconstructed images with full3D information and lossless details can be achieved bythe proposed method.3. The relationship between the parameters of the camera array pick-up systemand the display characters was built up and analyzed. Then the design method of thecamera array pick-up system for three-dimensional integral imaging was proposed.The design of a camera array pick-up system and the application in3D informationrecording of large scene verified the feasibility of the proposed design method.4. The errors in the elemental images captured by an optical pick-up methodwere analyzed. Two methods were presented to correct the errors of elemental imagesdue to individual position deviation of cameras in the camera array pick-up process.One is reference-point-needed, by calculating coordinates of the reference points, thecorresponding error-transformation matrices were calculated to correct the errors ofelemental images. The other is reference-point-free, the errors of elemental imageswere corrected by using the correlation of homologous points. The opticalexperiments verified that the effect of individual position deviation of cameras onelemental images was effectively eliminated by using both of the two proposedmethods.5. A novel method for generating large-scale elemental images using asmall-scale camera array was proposed based on the correlation of homologous pointsin the elemental images and virtual viewpoint generation technology.3D informationcapturing of real large scene and large-screen display of integral imaging was realizedby the proposed method. Meanwhile, to generate elemental images of3D model forthe large-screen display by ray tracing, a statistics based method of reconstructing the3D model was discussed theoretically and experimentally. The analysis andsimulation indicated the proposed method was strongly robust to the errors of thehomologous points.6. A novel real-time integral imaging pick-up and display system was proposedbased on a dual-camera optical pick-up system and projection-type display system. A real-time pick-up and display of real large3D scene was realized experimentally,which verified the feasiblility of the proposed method.