發(fā)布時(shí)間：2018-09-03 08:34

【摘要】：數(shù)字全息是一種記錄波場三維信息的新型方法,它利用數(shù)字?jǐn)z像機(jī)代替全息膠片并以數(shù)字化的方式存儲(chǔ)和捕獲物體波,然后用計(jì)算機(jī)仿真光源再次照射全息圖重建出物體波,從而獲得物體原始復(fù)振幅信息。相比基于膠片的全息技術(shù),數(shù)字全息不僅可以重建物體相位信息,而且成像方便、快速且簡單,在圖像處理技術(shù)方面蘊(yùn)含著強(qiáng)大性以及可操縱光場的技能,因此廣泛應(yīng)用于信息加密、顯微觀測、醫(yī)學(xué)診斷、元器件檢測等領(lǐng)域。數(shù)字全息的主要研究內(nèi)容包含成像光路、圖像增強(qiáng)算法以及實(shí)際應(yīng)用。本文研究數(shù)字全息的知識(shí)背景與最新進(jìn)展,分析數(shù)字全息成像的理論和方法步驟,研究如何抑制數(shù)字全息重建中的斑點(diǎn)噪聲和共軛像,實(shí)現(xiàn)數(shù)字全息在信息加密領(lǐng)域的應(yīng)用。論文的主要研究內(nèi)容和創(chuàng)新點(diǎn)如下:1)研究數(shù)字全息中的“斑點(diǎn)”現(xiàn)象,總結(jié)斑點(diǎn)噪聲的特征和模型;利用計(jì)算機(jī)模擬實(shí)現(xiàn)無透鏡數(shù)字全息顯微光路,采集到的全息圖像容易存在影響圖像分辨率的斑點(diǎn)噪聲;分析現(xiàn)有的圖像增強(qiáng)算法,給出一種融合算法,并與其它算法的實(shí)驗(yàn)數(shù)據(jù)展開比對分析。2)提出利用高斯過程回歸求解TIE方程算法來抑制全息圖像中的共軛像,利用計(jì)算機(jī)仿真實(shí)驗(yàn)過程,實(shí)驗(yàn)結(jié)果證實(shí)提出方法比傳統(tǒng)的GS方法去噪性能好。3)研究一種多平面菲涅爾數(shù)字全息與Arnold變換相融合的圖像加密方法,給出詳細(xì)的加密理論和過程,仿真實(shí)驗(yàn)結(jié)果證實(shí)該方法具有可操作性、穩(wěn)定性和安全性。
[Abstract]:Digital holography is a new method of recording three-dimensional information of wave field. It uses digital camera instead of holographic film and stores and captures object waves in a digital way, and then reilluminates hologram to reconstruct object waves with computer simulation light source. The original complex amplitude information is obtained. Compared with holography based on film, digital holography can not only reconstruct phase information of object, but also be convenient, fast and simple in image processing. Therefore, it is widely used in the fields of information encryption, microscopic observation, medical diagnosis, component detection and so on. The main research contents of digital holography include imaging optical path, image enhancement algorithm and practical application. This paper studies the knowledge background and recent development of digital holography, analyzes the theory and method of digital holographic imaging, studies how to suppress speckle noise and conjugate image in digital holographic reconstruction, and realizes the application of digital holography in the field of information encryption. The main contents and innovations of this paper are as follows: (1) the "speckle" phenomenon in digital holography is studied, the characteristics and models of speckle noise are summarized, and the microscopic optical path of lensless digital holography is realized by computer simulation. The collected holographic image is prone to speckle noise which affects the resolution of the image, the existing image enhancement algorithms are analyzed, and a fusion algorithm is presented. Comparing with the experimental data of other algorithms, the author proposes to use Gao Si process regression to solve the TIE equation algorithm to suppress the conjugate image in the holographic image, and to simulate the experimental process by computer. The experimental results show that the proposed method has better denoising performance than the traditional GS method. (3) A multi-plane Fresnel digital holography and Arnold transform image encryption method is studied, and the detailed encryption theory and process are given. The simulation results show that the method is feasible, stable and safe.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN26;TP391.41

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