本文選題：計算全息圖 + 三維顯示�。� 參考：《西安工業(yè)大學(xué)》2017年碩士論文

【摘要】：伴隨著三維顯示技術(shù)的飛速發(fā)展,人們不僅對分辨率,色彩的逼真度有了更高的追求,同時也要求在空間中給出與真實世界物體相同的立體顯示。計算全息技術(shù)的優(yōu)點眾多,它不僅使用方便、快捷,能夠記錄虛擬物體和三維物體的深度信息,還可以實現(xiàn)真三維顯示,因此計算全息技術(shù)在顯示領(lǐng)域受到了廣泛的重視。本文從全息術(shù)基本理論出發(fā),在菲涅爾衍射場的計算研究中,理論模擬、實驗探究了利用傅立葉變換法、卷積法所獲取到的數(shù)字化衍射場。發(fā)現(xiàn)當(dāng)衍射距離較小時,需利用卷積法計算衍射場;而衍射距離較大時,應(yīng)選取傅立葉變換法。隨后,本文選取計算速度快而更適合遠(yuǎn)距離顯示的傅立葉法來完成衍射場的計算;采用博奇編碼法,制作獲取二維物體計算全息圖。同時,深入研究全息再現(xiàn)像的位置,發(fā)現(xiàn)對于菲涅爾全息圖,若需要獲取清晰的再現(xiàn)像,必須使得再現(xiàn)距離等于記錄距離。三維物體具有縱深,其數(shù)據(jù)信息量遠(yuǎn)高于二維物體。由于層析法可記錄物體內(nèi)部結(jié)構(gòu)、對三維信息的處理方法相對簡單、計算效率高等優(yōu)勢,因此本文采用該方法制作虛構(gòu)的四層截面三維物體全息圖,并獲取到清晰再現(xiàn)像,證實該方法可用于三維全息圖的制作。隨后,提取3DS三維物體的外輪廓信息并利用層析法制作3DS三維物體的菲涅爾全息圖,發(fā)現(xiàn)當(dāng)利用物體反射信息制作全息圖時,可減少三維物體的信息數(shù)據(jù)量,且與人眼接收到的物體信息相符,更利于顯示。在三維物體再現(xiàn)過程中,均反映出只有再現(xiàn)距離等于記錄距離時,才可以得到清晰且三維立體感強(qiáng)的再現(xiàn)像。與此同時,本文還探討了液晶空間光調(diào)制器的像素結(jié)構(gòu)對全息再現(xiàn)像質(zhì)量的影響因素。發(fā)現(xiàn)空間光調(diào)制像素結(jié)構(gòu)中的填充因子以及像素間距對全息再現(xiàn)質(zhì)量有著重大影響,通過理論模擬與實驗探究發(fā)現(xiàn),當(dāng)填充因子增大時,空間光調(diào)制器的光能利用效率也隨之增加,即再現(xiàn)像強(qiáng)度增大;當(dāng)減小空間光調(diào)制器的像素間距時,再現(xiàn)像的尺寸大小增加且再現(xiàn)像的質(zhì)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.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O438.1

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