基于计算全息技术的三维显示

发布时间:2018-04-18 06:36

  本文选题:计算全息图 + 三维显示 ; 参考:《西安工业大学》2017年硕士论文


【摘要】:伴随着三维显示技术的飞速发展,人们不仅对分辨率,色彩的逼真度有了更高的追求,同时也要求在空间中给出与真实世界物体相同的立体显示。计算全息技术的优点众多,它不仅使用方便、快捷,能够记录虚拟物体和三维物体的深度信息,还可以实现真三维显示,因此计算全息技术在显示领域受到了广泛的重视。本文从全息术基本理论出发,在菲涅尔衍射场的计算研究中,理论模拟、实验探究了利用傅立叶变换法、卷积法所获取到的数字化衍射场。发现当衍射距离较小时,需利用卷积法计算衍射场;而衍射距离较大时,应选取傅立叶变换法。随后,本文选取计算速度快而更适合远距离显示的傅立叶法来完成衍射场的计算;采用博奇编码法,制作获取二维物体计算全息图。同时,深入研究全息再现像的位置,发现对于菲涅尔全息图,若需要获取清晰的再现像,必须使得再现距离等于记录距离。三维物体具有纵深,其数据信息量远高于二维物体。由于层析法可记录物体内部结构、对三维信息的处理方法相对简单、计算效率高等优势,因此本文采用该方法制作虚构的四层截面三维物体全息图,并获取到清晰再现像,证实该方法可用于三维全息图的制作。随后,提取3DS三维物体的外轮廓信息并利用层析法制作3DS三维物体的菲涅尔全息图,发现当利用物体反射信息制作全息图时,可减少三维物体的信息数据量,且与人眼接收到的物体信息相符,更利于显示。在三维物体再现过程中,均反映出只有再现距离等于记录距离时,才可以得到清晰且三维立体感强的再现像。与此同时,本文还探讨了液晶空间光调制器的像素结构对全息再现像质量的影响因素。发现空间光调制像素结构中的填充因子以及像素间距对全息再现质量有着重大影响,通过理论模拟与实验探究发现,当填充因子增大时,空间光调制器的光能利用效率也随之增加,即再现像强度增大;当减小空间光调制器的像素间距时,再现像的尺寸大小增加且再现像的质量也在提升。
[Abstract]:With the rapid development of 3D display technology, people not only have a higher pursuit of resolution and color fidelity, but also require the same stereoscopic display as real world objects in space.There are many advantages of CGH, which is not only easy to use, fast, can record the depth information of virtual objects and 3D objects, but also can realize true 3D display. Therefore, CGH technology has been widely paid attention to in the field of display.Based on the basic theory of holography, the numerical diffraction field obtained by Fourier transform and convolution method is simulated and experimentally studied in the Fresnel diffraction field calculation.It is found that the convolution method should be used to calculate the diffraction field when the diffraction distance is small, and the Fourier transform method should be chosen when the diffraction distance is large.Then, the Fourier method, which is faster and more suitable for long-distance display, is chosen to complete the diffraction field calculation, and the Bocky coding method is used to obtain the two-dimensional CGH image.At the same time, it is found that for Fresnel holograms, the reproducing distance must be equal to the recording distance if we need to obtain a clear reconstructed image.Three-dimensional objects have depth and the amount of data information is much higher than that of two-dimensional objects.Because the method of chromatography can record the internal structure of objects, the processing method of 3D information is relatively simple, and the calculation efficiency is high, so this method is used to fabricate the three-dimensional holograms of three-dimensional objects with four layers cross-section, and obtain the clear and reappeared images.It is proved that this method can be used in the fabrication of three-dimensional holograms.Then, the outer contour information of 3DS 3D object is extracted and the Fresnel hologram of 3DS 3D object is made by chromatography. It is found that the amount of data of 3D object can be reduced when making hologram with reflection information.And with the human eye received object information consistent, more conducive to display.In the process of 3D object reproduction, it is shown that only when the reappearance distance is equal to the recording distance, can a clear and three-dimensional 3D reappearance image be obtained.At the same time, the influence factors of the pixel structure of liquid crystal spatial light modulator on the holographic image quality are discussed.It is found that the filling factor and pixel spacing in spatial light modulation pixel structure have great influence on the holographic reproduction quality. Through theoretical simulation and experimental investigation, it is found that when the filling factor increases,The optical energy utilization efficiency of the spatial light modulator also increases, that is, the intensity of the reconstructed image increases; when the pixel spacing of the spatial light modulator is reduced, the size of the reconstructed image increases and the quality of the reconstructed image is also improved.
【学位授予单位】:西安工业大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:O438.1

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