發(fā)布時間：2018-06-26 09:04

  本文選題：復雜型面 + 三維掃描��； 參考：《華東理工大學》2012年碩士論文

【摘要】：隨著測量技術的不斷發(fā)展,非接觸式三維掃描儀已廣泛應用于產(chǎn)品改型、文物復制、和醫(yī)療診斷等領域。它能夠快速地獲取物體的三維點云數(shù)據(jù),利用建模軟件的數(shù)據(jù)合并、特征提取和曲面擬合等功能進行數(shù)據(jù)處理,重建物體的三維模型。本文主要致力于提高非接觸式三維掃描系統(tǒng)的掃描精度和速度,提出了針對不同復雜型面的掃描和建模方法,更好地滿足了高精度、高效率以及適合各種曲面的數(shù)字化應用需求。 三維掃描系統(tǒng)結構參數(shù)的偏差會導致測量坐標不精確,本文對三角測量原理和相機鏡頭畸變原理進行研究,通過修正鏡頭畸變提高掃描精度。為減少手動旋轉被測物體所帶來的誤差,本文設計了兩軸回轉系統(tǒng),通過與三維掃描儀配合使用,快速、準確的獲取與實際物體最為近似的點云數(shù)據(jù),實現(xiàn)了掃描的定量化操作。 某些無法避免的外部因素,使掃描過程中產(chǎn)生了大量的點云數(shù)據(jù)和噪聲點,為后續(xù)建模增加了難度。本文在對硬質合金可轉位刀片建模過程中,通過研究ICP算法原理和NURBS曲面生成原理,在Geomagic Studio點階段對點云數(shù)據(jù)進行噪聲去除、數(shù)據(jù)精簡和點云拼接等處理；多邊形和形狀階段將處理后的點云數(shù)據(jù)轉化為一個理想的曲面模型；制作階段通過特征提取提高產(chǎn)品的設計效率,完善產(chǎn)品的性能分析。
[Abstract]:With the development of measurement technology, contactless 3D scanners have been widely used in the fields of product modification, cultural relic reproduction, medical diagnosis and so on. It can quickly acquire the 3D point cloud data of the object and reconstruct the 3D model of the object by using the functions of data merging feature extraction and surface fitting of the modeling software. In this paper, the scanning accuracy and speed of the contactless 3D scanning system are improved, and the scanning and modeling methods for different complex surfaces are proposed, which can better meet the high accuracy. High efficiency and suitable for digital applications of various surfaces. The deviation of structural parameters of 3D scanning system will lead to the imprecision of measuring coordinate. In this paper, the principle of triangulation and camera lens distortion is studied, and the scanning accuracy is improved by correcting lens distortion. In order to reduce the error caused by the manual rotation of the measured object, a two-axis rotary system is designed in this paper. Through the use of the 3D scanner, the point cloud data which is the closest to the actual object can be obtained quickly and accurately. The quantitative operation of scanning is realized. Some unavoidable external factors make the scanning process produce a lot of point cloud data and noise points, which makes the subsequent modeling more difficult. In this paper, in the process of modeling cemented carbide indexable inserts, by studying the principle of ICP algorithm and Nurbs surface generation, the point cloud data are removed, data reduced and point cloud splicing are processed in Geomagic Studio. The polygon and shape phase transform the processed point cloud data into an ideal curved surface model, and improve the design efficiency and performance analysis of the product by feature extraction in the production stage.
【學位授予單位】：華東理工大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TP391.41;TP334.22

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本文編號：2069865