| Three-Dimensional(3D)display can show viewers amazing 3D images with a sense of depth.Integral imaging 3D display technology has become one of the focuses in the field of 3D display for its advantages of no need to wear auxiliary viewing equipment,obvious depth cue and easy realization of full color and full parallax display and so on.Integral imaging technology mainly involves light field acquisition technology and 3D display technology.Light field acquisition offers film source to 3D display.Due to the limitation of data processing ability and imaging quality of optical components,integral imaging has some challenges such as low efficiency of film source acquisition and insufficient 3D image resolution.In this thesis,these difficulites are given priority to studied,and some reliable and effective techniques and methods are put forward originally.The research content include five aspects.(1)Two models of light field acquisition for integral imaging are constructed,the acquisition model of light field based on the lens array and the acquisition model of light field based on the viewpoint.The basic principle,application process and applicable condition of two models of light field acquisition are analyzed,respectively.In the process of integral imaging 3D display,the performance parameters of 3D image are illustrated,subsequently the meaning of “high-resolution 3D image” is supplemented and improved in the thesis,paving an important theoretical basis for the following research work.(2)To solve the problem of long time consuming in the light field acquisition process caused by the increase of the number of viewpoints,based on the light field acquisition model of the viewpoint,we propose the super-resolution technique of the element image array(EIA)based the convolutional neural network.The technique mainly includes two necessary processes,the light field acquisition of sparse camera array and the super resolution of EIA.Firstly,the low-resolution EIA is generated by using the light field acquisition strategy of sparse camera array,then the highresolution EIA is obtained by the fast super-resolution convolutional neural network model,and finally,the effectiveness of the presented method is verified by highresolution integral imaging 3D display experiments.(3)In order to address the problem that Moire fringe and lens noise interfering with visual quality in the 3D image of integral imaging,the method of eliminating Moire fringe and lens noise based on the optical diffuser is proposed.By using the precise light diffusing characteristic of the optical diffuser,the separation imaging of the subpixel and the uneven reflection of the lens array are weakened,so that the Moire fringe and lens noise are invisible.Aimed at the insufficient resolution of the 3D image,the lens array fabrication technique based on the soft-lithography is explored out.Using the ready-made lens array as the mold,a new lens array is designed and fabricated by UV glue,improving the optimization freedom degrees of the lens array.At the same time,the collimation backlit module of a point light source is designed,which reduces the imaging beam size and enhances the resolution of the 3D image.(4)To address the problem that 3D display is not compatible with 2D display in the integral imaging system,the 2D and 3D compatible display method of using dual-state light modulation component is proposed,and the high-resolution 2D/3D compatible display system is set up.The proposed system is composed of an integral imaging 3D display,a projector and a dual-state light modulation component which is coupled by an optical diffuser and a polymer dispersed liquid crystal film.By controlling the power on and off of the polymer dispersed liquid crystal film,two light modulation states can be switched,and then the three functions of 2D image,3D image display independently and 2D image as well as 3D image display combined can be realized.In each display state,the resolution of 2D and 3D images remain unchanged without loss and mutual interference.(5)Aiming at the problem that low resolution of the integral imaging 3D image far from the center depth plane,the floating 3D display method of using the dihedral corner reflector array is come up with,and the high-resolution integral imaging floating 3D display system is set up.The proposed system contains a dual integral imaging 3D display subsystem and a dihedral corner reflector array.Based on the floating and transillumination optical properties of the dihedral corner reflector array,the light field information of the dual integral imaging display is effectively reconstructed,increasing the total amount of light field of the system and improving the resolution of the 3D image far from the center depth plane. |
