Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2620
DC FieldValueLanguage
dc.contributor.advisor李吉群zh_TW
dc.contributor.author曾棋文zh_TW
dc.date2004zh_TW
dc.date.accessioned2014-06-05T11:43:38Z-
dc.date.available2014-06-05T11:43:38Z-
dc.identifier.urihttp://hdl.handle.net/11455/2620-
dc.description.abstract本研究使用液晶投影機(LCD)配合電荷藕合元件(CCD)還原出三維曲面輪廓,並且以相對方位(Relative Orientation)校正CCD和LCD之間的相對位置,以取得其旋轉和平移的關係,之後再應用實際所求得之尺寸和量測所求得之尺寸之間比例校正基底尺寸。由於相對方位的校正是以CCD相機成像位置之射線及液晶投影機成像位置之射線交點當其校正的依據,但因為射線在經過相機取像和投影機投影時,會通過其透鏡而使的射線扭曲,近而使成像產生變形或投射出的影像產生變形,故在校正相對方位時,要先校正射線因透鏡所產生的扭曲。其中液晶投影機成像位置是以格雷式編碼及五步相位移所計算出的絕對相位替代。以此方法計算出的絕對相位也可以避免傳統雙攝影機找尋空間中對應點的問題,並且也可避免傳統相位移量測曲面時落差太大所遭遇的相位不連續的缺點。zh_TW
dc.description.abstractIn this paper, we propose a method to construct the surface profile from our measurement by using a LCD projector and a CCD camera. In order to calibrate the relative position between LCD projector and CCD camera, we use Relative Orientation to obtain their relationship of translation and rotation, and then we can calibrate the baseline scale by comparing measurement size physical size. While acquiring images from the camera, lens will introduces distortion. For that reason, before calibrating the relative position between LCD projector and CCD camera, we have to calibrate the distortion first. Because the projector dose not have a physical image plane, so we use Gray code and phase shifting technique to restore the absolute phase and obtain a virtual image plane of the projector, thus we can calibrate the distortion in images. With this method, we need not to find the feature point like in binocular stereo vision system and also can avoid discontinuous phase problem when measuring a surface with a drop height in conventional phase shift measurement.en_US
dc.description.tableofcontents摘要..........................................................I Abstract.....................................................II 誌謝........................................................III 目錄.........................................................IV 圖目錄......................................................VII 表目錄........................................................X 第一章 緒論...................................................1 1.1 前言......................................................1 1.2 研究動機..................................................2 1.3研究方法...................................................2 1.4 文獻回顧..................................................3 1.5論文架構...................................................4 第二章 量測原理...............................................5 2.1量測原理概述...............................................5 2.2 結構光(Structured Light)介紹..............................6 2.2.1 相位移法................................................7 2.2.2格雷式編碼法.............................................9 2.3絕對相位的計算............................................13 2.4相機校正..................................................20 2.4.1 Tsai’s相機校正法......................................21 2.4.2 Tsai’s的相機校正方法與步驟............................25 2.5相對方位校正..............................................30 2.5.1系統未知數和已知條件....................................31 2.5.2系統共平面限制條件......................................34 2.5.3相對方位的校正方法......................................36 2.6 影像處理方式.............................................40 2.6.1閥值(Threshold Value)的決定方式.........................40 2.6.2形心的表示方式..........................................42 2.7結論......................................................42 第三章 量測系統建立與校正....................................43 3.1 系統架構.................................................43 3.2 校正程序.................................................46 3.2.1系統亮度線性化校正......................................47 3.2.2將設計好的校正平板裝在三次元量床上......................50 3.2.3液晶投影機投射結構光與CCD相機取像.......................50 3.2.4移動三次元量床..........................................53 3.2.5使用形心法求解電腦像素座標值............................55 3.2.6相機校正................................................56 3.2.7線性內插出絕對相位......................................56 3.2.8液晶投影機校正..........................................58 3.2.9液晶投影機和CCD相機相對方位的校正.......................60 3.2.10基線(baseline)校正.....................................60 3.3 結論.....................................................60 第四章 實驗結果與討論........................................61 4.1亮度線性校正結果..........................................61 4.2相機與投影機校正結果......................................63 4.3相對方位的校正結果比較....................................66 第五章 結論與未來展望........................................71 參考文獻.....................................................72zh_TW
dc.language.isoen_USzh_TW
dc.publisher機械工程學系zh_TW
dc.subjectrelative orientationen_US
dc.subject相對方位zh_TW
dc.subjectcamera calibrationen_US
dc.subjectabsolute phaseen_US
dc.subject相機校正zh_TW
dc.subject絕對相位zh_TW
dc.title液晶顯示投影三維曲面量測系統相對方位校正之研究zh_TW
dc.titleStudy of relative orientation calibration in LCD fringe projection profilometryen_US
dc.typeThesis and Dissertationzh_TW
item.languageiso639-1en_US-
item.openairetypeThesis and Dissertation-
item.cerifentitytypePublications-
item.grantfulltextnone-
item.fulltextno fulltext-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
Appears in Collections:機械工程學系所
Show simple item record
 
TAIR Related Article

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.