發(fā)布時間：2018-05-30 05:32

  本文選題：計算全息 + 全息三維顯示�。� 參考：《昆明理工大學(xué)》2017年碩士論文

【摘要】：全息三維顯示技術(shù)能夠再現(xiàn)三維物體光波前分布的全部信息,被認為是最具發(fā)展前景的真三維顯示技術(shù)�；诳臻g光調(diào)制器的全息三維顯示技術(shù),可以實現(xiàn)實時動態(tài)真彩色三維顯示的效果,因此吸引了國內(nèi)外各個高校和研究機構(gòu)的廣泛關(guān)注。目前,計算全息三維顯示技術(shù)的發(fā)展主要受制于顯示器件分辨率低、全息圖計算量大等問題,如何提高顯示設(shè)備的分辨率以及獲得快速生成計算全息圖的算法和系統(tǒng)是目前還需研究的問題。本文主要開展基于液晶空間光調(diào)制器的計算全息圖快速生成算法的研究,研究內(nèi)容簡述如下:首先綜述了三維顯示技術(shù)并分析了三維顯示技術(shù)的現(xiàn)狀與發(fā)展。介紹基于標量衍射計算的相關(guān)理論知識,并對光波通過光學(xué)系統(tǒng)的波前重建公式的修正進行了分析。當光波在非單一介質(zhì)中傳播時,給出了將記錄距離等效為介質(zhì)中傳播距離的方法。結(jié)果表明,計算光波在介質(zhì)中傳播的等效距離,并采用等效距離對數(shù)字全息圖進行波前重建的結(jié)果與采用柯林斯公式重建的結(jié)果是一致的。其次,簡要的說明了空間光調(diào)制器的基本性能及相位調(diào)制原理。對空間光調(diào)制器的脈沖響應(yīng)進行了簡單推導(dǎo),導(dǎo)出基于空間光調(diào)制器的全息三維顯示系統(tǒng)的焦深。采用基于迭代的菲涅爾衍射積分逆運算重建算法實現(xiàn)相位全息圖的生成,并進行了模擬重建實驗和光學(xué)實驗重建。最后,對傳統(tǒng)點源法的基本原理及改進算法進行了介紹,重點研究了波前記錄算法,并進行了相關(guān)的模擬和實驗。在此基礎(chǔ)上,根據(jù)課題組之前的研究內(nèi)容,給出基于焦深分層的光源變換算法,考慮環(huán)境光照明和物體隱藏面的消除,實現(xiàn)三維物體的計算全息圖快速生成及顯示,相對于傳統(tǒng)的點源算法,光源變換算法生成計算全息圖的速度提高了兩個數(shù)量級左右,同時,由于在投影平面到全息面采用快速傅里葉變換算法,根據(jù)物平面和全息面的尺寸關(guān)系,能夠?qū)崿F(xiàn)大尺寸的三維物體重建。在焦深范圍內(nèi),采用光源變換算法對簡單的彩色三維物體進行了模擬重建,可為后期實現(xiàn)復(fù)雜彩色三維物體全息顯示打下基礎(chǔ)。搭建了基于空間光調(diào)制器的全息三維顯示系統(tǒng),實現(xiàn)了三維物體的光電再現(xiàn),取得了較好的實驗結(jié)果。
[Abstract]:The holographic 3D display technology can reproduce all the information of the 3D object optical wavefront distribution and is considered to be the most promising true 3D display technology. The holographic 3D display technology based on spatial light modulator can realize the effect of real-time dynamic true color 3D display, so it has attracted wide attention of universities and research institutions at home and abroad. At present, the development of CGH 3D display technology is mainly restricted by the low resolution of display devices and the large amount of calculation of hologram. How to improve the resolution of display equipment and how to obtain the algorithm and system for fast generation of CGH are still problems to be studied. In this paper, the fast generation algorithm of CGH based on liquid crystal spatial light modulator is studied. The research contents are summarized as follows: firstly, the 3D display technology is reviewed, and the present situation and development of 3D display technology are analyzed. The related theoretical knowledge based on scalar diffraction calculation is introduced, and the correction of wavefront reconstruction formula of light wave passing through optical system is analyzed. When the light wave propagates in a non-single medium, a method of equating the recording distance to the propagation distance in the medium is given. The results show that the calculation of the equivalent distance of light wave propagation in the medium and the reconstruction of digital holograms by using the equivalent distance are consistent with the results of the reconstruction using Collins formula. Secondly, the basic performance of spatial light modulator and the principle of phase modulation are briefly explained. The pulse response of spatial light modulator is deduced and the focal depth of holographic 3D display system based on spatial light modulator is derived. An iterative Fresnel diffraction integral inverse reconstruction algorithm is used to generate the phase hologram, and simulated reconstruction experiments and optical experimental reconstruction are carried out. Finally, the basic principle and the improved algorithm of the traditional point source method are introduced, and the wavefront recording algorithm is studied, and the simulation and experiment are carried out. On this basis, according to the previous research contents of the research group, a light source transformation algorithm based on the layer of focal depth is presented, which takes into account the illumination of the environment and the elimination of the hidden surface of the object to realize the fast generation and display of the 3D object's CGH. Compared with the traditional point source algorithm, the speed of generating CGH by the light source transform algorithm is increased by about two orders of magnitude. At the same time, the fast Fourier transform algorithm is used in the projection plane to the holographic plane. According to the dimension relation between the object plane and the holographic plane, the large-scale three-dimensional object reconstruction can be realized. In the range of focal depth, the light source transform algorithm is used to simulate and reconstruct the simple color 3D object, which can lay the foundation for the realization of the complex color 3D object holographic display in the later stage. A holographic 3D display system based on spatial light modulator is built, and the photo-electric reconstruction of 3D object is realized, and good experimental results are obtained.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O438.1;TP391.41

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本文編號：1954114