Reconstruction Quality Improvement In Integral Imaging And Integral Holography

In the past two decades, many new 3D imaging and 3D display technologies have been exten-sively researched for diverse applications. Among these research, two type of 3D imaging and display technologies:integral imaging and integral holography, which are considered as "real 3D display technologies", have been focused in this dissertation. Although integral imaging and integral Fourier holography has shown many promising advantages, its recon-structed image quality is still limited by the parameter constraints of imaging and display systems. To improve the reconstruction quality, this dissertation carries out the following research:In integral imaging part:1) An micro-scanning based integral imaging system has been combined with a 2D super res-olution algorithm to enhance the resolution of the 3D reconstructed image. With the micro-scanning technique, a seris of elemental image arrays with subpixel displacement can be captured. Then, with the super resolution algorithm, a set of high resolution elemental im-ages can be generated to computational reconstruct or optical display the original 3D scene. Thus, this time multiplexing method can recover part of degraded image quality in elemetal images, which can further improve the 3D reconstruction quality.2) A novel three-dimensional (3D) super resolution reconstruction technique by integral imaging to reconstruct a high-resolution 3D image directly from a series of low-resolution perspective projections of a 3D scene has been proposed. In conventional integral imaging, every depth of the 3D scene is imaged by multiple lenses on the sensor plane with an ac-curate disparity of multiple perspective viewpoints. However, this disparity is pixelated by the digital structure of the capturing sensor, which leads to a loss of the sub-pixel disparity information of the multiple perspective viewpoints. Here, this sub-pixel information is re-stored by the proposed 3D super resolution method in order to improve the resolution of the reconstructed 3D images. Also, this 3D super resolution reconstruction technique has been utilized in infrared imaging to reconstruct a high resolution infrared 3D scene. In integral holography part:1) The space-bandwidth product of integral Fourier holographic imagery is derived to char-acterize its information transfer property. Furthermore, based on this analysis, an integral Fourier holographic imaging method based on micro-scanning of the micro-lens array is proposed. The micro-scanning of the micro-lens array can increase the sampling rate in spa- tial frequency domain and the information of the generated Fourier hologram, which will eventually eliminate the overlapping effect in the reconstructed 3D image.2) Based on the analysis of the space-bandwidth product of integral Fourier holographic im-agery, we propose the aliasing and overlapping elimination methods by estimating interme-diate elemental images and orthographic projection views as virtual samplings, to improve the sampling rate in the space and spatial frequency domains. This methods can effectively eliminate aliasing and overlapping, and enhance the reconstructed holographic image quality. Also, in integral holography, the reconstructed 3D image quality is affected by lenses posi-tional errors in micro-lens array. We analyzed the spatial distortion effects in reconstructed 3D integral Fourier holographic image which are caused by misarrangements of elemental lenses in micro-lens array. Then, the intermediate projection views generation method is used to eliminate the spatial distortion effects in reconstruction. This method provides a so-lution to adjust the lens-array manufactured errors in realistic integral holographic imaging. At last, the Pseudoscopic-to-Orthoscopic Conversion (SPOC) method has been used to ad-just the sampling rate of the integral Fourier holographic system to adapt different 3D objects without requiring addition information.