發(fā)布時間：2018-07-10 13:04

  本文選題：口腔窺鏡 + 波前編碼　； 參考：《天津大學》2012年碩士論文

【摘要】：現(xiàn)代口腔窺鏡分為照相型和顯微型兩類。照相型窺鏡景深大、視場大,但細節(jié)分辨能力較弱;顯微型窺鏡能很好的分辨細節(jié),但是景深小、視場小。針對需要一定視場和分辨率要求的口腔診斷場合,本文提出了一種波前編碼技術(shù)口腔窺鏡設(shè)計方案。在保持原有分辨率不降低的情況下達到拓展口腔窺鏡景深的目的,并進行了光學編碼成像系統(tǒng)、圖像采集系統(tǒng)和編碼圖像恢復算法的研究,完成的主要工作如下: 根據(jù)口腔診斷要求,提出了一種波前編碼口腔窺鏡設(shè)計方案,該方案能夠在保證對視場和分辨率要求的情況下,有效拓展景深。該方案在保證一定觀測視場的前提下,能有效解決景深和分辨率的矛盾。 提出了一種基于規(guī)范相關(guān)系數(shù)的相位板參數(shù)優(yōu)化方法,利用該方法獲得了波前編碼口腔窺鏡光學系統(tǒng)離焦不變性曲線,確定了相位板歸一化參數(shù)的區(qū)間,結(jié)合ZEMAX最后確定了三次相位板的結(jié)構(gòu)參數(shù),并且對比分析了傳統(tǒng)光學系統(tǒng)和波前編碼光學系統(tǒng)的特性,并最終完成了波前編碼光學系統(tǒng)的設(shè)計和評價。 提出了一種嵌入圖像采集系統(tǒng)設(shè)計方案,實現(xiàn)了圖像的采集、存儲和顯示。改進了現(xiàn)有的波前編碼圖像退化函數(shù)估計方法,提出了一種波前編碼退化模型,并實現(xiàn)了波前編碼口腔窺鏡的退化函數(shù)正確估計,采用維納濾波的算法對輻條型分辨率板、口腔內(nèi)部病灶等編碼圖像進行了圖像恢復,復原后圖像清晰。
[Abstract]:Modern oral endoscopy is divided into two categories: photographic and microscopic. Photographic speculum has large depth of field of view and large field of view, but the resolution of detail is weak, and the microscopic speculum can distinguish details well, but the depth of field is small and the field of view is small. In this paper, a design scheme for oral speculum with wave-front coding technique is proposed for oral diagnosis which requires a certain field of view and resolution. The purpose of expanding the depth of field of oral speculum is achieved without decreasing the original resolution, and the optical coding imaging system, image acquisition system and coding image recovery algorithm are studied. The main work is as follows: according to the requirements of oral diagnosis, a design scheme of wave-front coded oral speculum is proposed, which can effectively expand the depth of field under the condition of ensuring the requirement of field of view and resolution. This scheme can effectively solve the contradiction between depth of field and resolution on the premise of certain observational field of view. In this paper, a phase plate parameter optimization method based on normalized correlation coefficient is proposed. The defocus invariance curve of wave-front coded oral speculum optical system is obtained by using this method, and the range of normalized phase plate parameters is determined. The structural parameters of the cubic phase plate are determined with ZEMAX, and the characteristics of the traditional optical system and the wave-front coded optical system are compared and analyzed. Finally, the design and evaluation of the wave-front coded optical system are completed. A design scheme of embedded image acquisition system is presented, which realizes image acquisition, storage and display. In this paper, the existing methods for estimating the degradation function of wavefront coded image are improved, a degradation model of wavefront coding is proposed, and the degradation function of the wavefront coded oral speculum is estimated correctly. The wiener filter algorithm is used to estimate the resolution plate of the spoke type. The image was recovered from the coding image such as the focus of oral cavity, and the image was clear after restoration.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH776

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