在建築物的施工或維護階段，如使用者需在現地檢視BIM模型，傳統的方式是於攜帶至現場的平板電腦或筆記型電腦上的BIM Viewer軟體上呈現，而欲透過BIM Viewer檢視現地中的某個建築元件，需先以手動方式尋找該元件的所在位置，選取其元件才能檢視其相關資訊與參數，此種方式不但需要手動的模型檢視操作操作，才能將資訊即時回饋給使用者，而且透過電腦觀看模型無法與現地真實所見情景結合，在畫面上無法同步與整合，使用室內定位技術來取代手動元件查詢可以提高現場操作的效率，此外，應用擴增實境(Augmented Reality，AR)技術可將現場影像與BIM模型做虛實整合的呈現，以更加即時且直觀地支持現場的操作。本計畫將研究整合擴增實境與室內定位技術之BIM資訊現地呈現系統，讓所建立包含建物元件屬性參數之BIM，可以和現地影像疊合的模式直接呈現在現地中，其是以3D模型呈現BIM模型場景，輔以文字顯示BIM元件之屬性參數，透過擴增實境設備疊加顯示於現地的建築元件上，即時回饋給使用者。此系統是以低功耗藍芽(Bluetooth Low Energy，BLE)技術於建築物內建置室內定位的環境，以即時定位使用者於建築物中所在的房間並載入相對應的BIM模型場景，並導入基於電腦視覺之無標記追蹤技術(Markerless-Based Tracking)，對現場的環境與建築元件做特徵點分析，透過特徵點計算出對應現場使用者視角之BIM模型場景中系統攝影機的位置與角度，使系統攝影機視角與現場使用者視角一致，即可將BIM模型場景對齊並疊合於現地場景的影像上，達到虛實整合的目的。

In the circumstance of on-site operations, a conventional way to use Building Information Model (BIM) for assisting these operations in indoor environment is using portable computer with BIM software to view the BIM in site. In this manner, manual navigation in virtual space is required for locating and accessing the corresponding model components of building elements encountered in site. In addition, the views of the real site and the virtual BIM are not synchronized and integrated. Using indoor positioning technology to provide automatic model navigation can improve the efficiency for these on-site operations. Further, applying Augmented Reality technology can combine virtual information on real scene to support these on-site operations more instantly and intuitively. Therefore, this study integrated Augmented Reality (AR) and indoor positioning technologies to develop an on-site BIM viewer. In the proposed viewer, BIM information is displayed and superimposed on real building elements in 3D models scences or surrounding texts using AR technology to provide instant feedback to the user. The system uses Bluetooth Low Energy (BLE) technology to establish an indoor positioning environment in a building for identifying the room which the user is currently located and loading the room’s BIM model, and then Markerless-Based Tracking technology based on computer vision is applied in the system to track the feature points of the environment and the building elements in the image of real scene. Based on the feature points, the system calculates the location and angle of the system camera in the BIM model which is corresponding to the field user's perspective and orients the system camera to obtain the virtual scene which is consistent with the field user’s perspective. The virtual can then be aligned and superimposed on the image of the real scene to achieve the goal of cyber-physical integration.

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