以二維影像輪廓資料重建三維物體模型

Abstract

本論文研究之目的是建立一套自動化物體模型重建系統，並發展利用二維影像輪廓來重建三維物體模型之技術，藉由二維影像輪廓的建立，使物體能夠呈現出三維立體的模型，可應用於醫學物理療法中，例如:核磁共振造影系統、核子醫學系統…等等，並可結合機械手臂系統，達到辨識與挾持物體之自動化功能。 在產生三維立體模型方法中，目前最常見到的有下列幾種:第一，最為直接的方式，是使用三維模型繪圖軟體(如:3D Maxs)來製作出三維的模型；第二，使用三維量測掃描系統，對物體直接進行掃描，透過三維空間資料，以電腦建立出三維立體模型；第三，使用攝影機拍攝，藉由所得到的二維數位影像組合，或經數位影像處理後，搭配一些演算法，並建立出三維立體模型。 本研究即採用第三種方式，來建立三維立體模型。首先，藉由投影原理的概念，以兩台CCD 攝影機，模擬出工程圖學四個象限中之第一象限的直立式投影面與水平式投影面，並且將此兩面的投影，透過本論文的演算法，把二維影像序列的座標值提取出來。並搭配OpenGL的函式，將三維的座標點連結後，即可得粗略的三維立體模型，接著佈局網格，並且進行著色與打光的技術，三維的立體模型即可完整地產生出來。 由實驗結果可得知，本研究成功地建立一套三維立體模型重建系統，利用攝影機拍攝物體外型並經過多重數位影像處理技術，將物體之三維立體模型重新建立於電腦中，用以提供機械手臂作後端處理之用。

This paper proposes reconstruction of a 3D object model using 2D image contours data, with building the two-dimensional image contours, so that objects can show three-dimensional model, and applied to medical physical therapy, for example: magnetic resonance imaging systems, nuclear medicine system, and so on .... And then combine with a robot which can achieves an automatic system. Generated three-dimensional model approach, is currently the most commonly seen are the following: first, the most direct way is to use three-dimensional model of graphics software (such as: 3D Maxs) to produce three-dimensional model; Secondly, the use of three-dimensional measurement scanning system to scan objects directly through the three-dimensional information in order to establish a three-dimensional computer model; Third, the use of camera, obtained by two-dimensional digital imaging portfolio, or digital image processing, with Some algorithms, and the establishment of a three-dimensional model. In this study, which adopts the third approach, to create three-dimensional model. First of all, by the principle of the concept of projection to the two CCD cameras, the engineering graphics simulation of the four quadrants in the first quadrant of the vertical and horizontal projection surface type, and this two-sided projection, through the papers algorithm, the two-dimensional coordinates of the image sequence extracted value. Through the OpenGL function, will link three-dimensional coordinates of points, you can get a rough three-dimensional model, then the layout of the grid, and for shading and lighting technology, three-dimensional model can be generated. From the experimental results, this research establishes an automatic 3D object model reconstructed system. The system builds a 3D object model in computer by CCD camera and multiple image processes technology. The model will provide to robot using for the next stage.