應用於模擬心臟跳動的模型建立與處理方法

The Application of Modeling and Treatment for Simulation of Human Heart Beat

鄧志堅(Jyhjeng Deng) ； 陳俊清(Chun-Chin Chen)

《科學與工程技術期刊》 6卷4期 (2010/12) Pp. 27-38

https://doi.org/10.7117/JSET.201012.0027

摘要

本研究主要是運用非接觸式的量測儀器量測心臟模型的表面，並使用其點雲資料完成曲面的建構，再撰寫MATLAB程式模擬心臟的跳動狀況。作法是用光學掃描並以Rapidform XOR2軟體的內建功能鋪設心臟的NURBS曲面。由於本研究所使用的心臟模型分爲兩片，因此，在建構這兩個心臟零件的NURBS曲面後，加以模擬及跳動的方式是非常複雜的。所以利用剖面切割的方式將兩片做成一個NURBS的曲面，並且由MATLAB展示該NURBS曲面。之後再由貼圖的方式將經由影像處理之心臟的影像圖貼於建構的NURBS曲面上。末了，藉由建構由心臟的NURBS曲面之控制點來產生這些點的重心並且以該重心爲原點沿著控制點的方向建構射線，控制點將沿著射線方向作有規律的前後移動。每移動一次就建構一次新的心臟曲面，如此就可以模擬心臟的跳動。

關鍵字

NURBS曲面 ； 逆向工程 ； 曲面建構 ； 影像處理

並列摘要

This study uses non-contact digitizers to measure the surface of the human heart. The proposed approach also uses a point cloud to reconstruct the surface, and implements a MATLAB code to simulate human heartbeats. The proposed approach first uses an optical digitizer to scan the artifact and the built-in function of Rapidform XOR2 to construct the NURBS surface. Because constructing two NURBS surfaces that can mimic the heart beating in two parts is a complicated process, this study uses a simplified NURBS surface represented in MATLAB to substitute both parts. Next, a texture mapping method pasted the combined heart artifact image to the constructed NURBS surface using image processing. Finally, finding the centroid of the control points of the heart artifact makes it possible to construct directional rays from the centroid to each control point. Moving the control points forward and backward along the rays makes it possible to construct a new NURBS surface for each move, and thus mimic human heartbeats.

並列關鍵字

NURBS surface ； reverse engineering ； surface modeling ； image processing