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主動視覺式三維掃描儀之建置與評估 = Design, implement...

國立高雄大學資訊工程學系碩士班

主動視覺式三維掃描儀之建置與評估 = Design, implementation and evaluation of an active vision-based 3-d scanner

紀錄類型:	書目-語言資料,印刷品 : 單行本
並列題名:	Design, implementation and evaluation of an active vision-based 3-d scanner
作者:	簡祥任,
其他團體作者:	國立高雄大學
出版地:	[高雄市]
出版者:	撰者;
出版年:	民99[2010]
面頁冊數:	139面圖，表 : 30公分;
標題:	主動掃描
標題:	precise measurement
電子資源:	http://handle.ncl.edu.tw/11296/ndltd/64270456473471313149
摘要註:	隨著三維運算科技及其應用迅速的發展，對物件形體之數位化工作的需求與日俱增。在電腦視覺領域與測量工程中，建立低價高效益之掃描儀器一直以來是重要的研究課題。其中又以主動式光學掃描技術為主流之一，而結構光法（structured light method）即是一種廣泛使用的三維測量技術。使用影像感測器擷取、處理並分析投影光型（light pattern），結構光技術能快速的建立細緻的表面模型。傳統的結構光方法仍有諸多待改善之技術細節，例如校正程序與光型解碼等問題。基於結構光法，本研究建立一具高精度的三維掃描儀，並提出多項改善。改進之方向乃是針對二方面，即系統校正（calibration）與立體匹配性（stereo correspondences）的建立。在系統校正上，我們設計了一目標適性方法，將傳統結構光轉變為反饋式封閉迴路，使其能使用輸入影像動態生成校正樣板。在實驗結果中證明，該方法能大幅改進校正誤差且避免大量的光型投影與計算工作。另一方面，我們針對立體匹配性的建立提出改良。為能更精確的解碼投影光型，本研究設計了二元像素分類器，使用貝氏推論（Bayesian inference）與核方法（kernel method）動態學習像素亮度比率之分佈模型。經過改善後，測量系統能達到次釐米精度之三維測量。 The structured light method is an active vision-based surface recovery approach that provides a cost-efficient solution for 3-dimensional reconstruction. The performance of a structured light based scanner depends on the accuracy of system calibration as well as the acquisition of stereo correspondences. The conventional calibration of a structured light system requires the use of different targets to calibrate the camera and the light projector separately. In this work we proposed a novel method that utilizes just one target to finish the calibration. To overcome the identification problem of light patterns, the proposed method is able to generate calibration pattern in an adaptive manner. The experimental results show that the proposed method can achieve accurate calibration.The establishment of stereo correspondences is also key to precision measuring. To accelerate the acquisition of camera-projector pixel correspondences, a typical structured light scanner usually deploys binary-coded patterns. The extraction of binary light pattern can be problematic if the lighting condition is not carefully taken into account. We have designed a probabilistic pixel classification mechanism, which is expected to achieve more reliable identification of projected light patterns. The result of this research is a built low-cost scanner that is able to perform accurate 3-d measuring tasks.

主動視覺式三維掃描儀之建置與評估 = Design, implementation and evaluation of an active vision-based 3-d scanner
簡, 祥任

主動視覺式三維掃描儀之建置與評估 = Design, implementation and evaluation of an active vision-based 3-d scanner / 簡祥任撰 - [高雄市] : 撰者, 民99[2010]. - 139面 ; 圖，表 ; 30公分.
參考書目：面.
主動掃描precise measurement

主動視覺式三維掃描儀之建置與評估 = Design, implementation and evaluation of an active vision-based 3-d scanner
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