智慧行動裝置上之擴增實境定位技術

Abstract

擴增實境可藉用從興趣點資料庫所獲得的位置和方向資訊來豐富位置感知服務。個人導覽系統可利用擴增實境技術來建立。然而要將擴增實境物件放置到正確的位置，需要高精確的定位技術，其精確度的需求遠超於現今市面上的定位技術，如全球定位系統(GPS)、室內射頻系統(RF)。因此在此篇論文中，我們提出了一個以擴增實境為基礎的定位技術，讓使用者可以利用此技術來定位出他們的位置。首先，藉由一個粗略的定位系統，擴增實境物件可以粗略的顯示在擴增實境裝置的螢幕上。接著，透過使用者的拖放擴增實境物件，擴增實境物件可以和實際景物進行配對。因此，便可得知擴境實境物件的實際和影像座標，並且在已知相機焦距的情況下，拍攝相片的位置便可求得。相機的位置可被視為使用者的位置。我們提出的定位技術，非常適合的用來發展高精確的個人導覽系統。

Augmented Reality (AR) can be used to enrich LBS application by utilizing position and orientation information from a location database of POIs. The AR technique is suitable to develop intuitional Pedestrian Navigation Systems (PNSs). Higher positioning accuracy is needed for displaying AR objects at proper places. However, current commercial positioning solutions, such like outdoor GPS and indoor RF systems, cannot provide required positioning accuracy. In this paper, we propose an AR-based positioning technique for AR users to locate their current locations. First, by utilizing a coarse positioning system, AR objects can be roughly displayed on the touch screen of an AR device. Then, AR objects can be matched with their images on the display via drag-and-drop operations by users. Thus, both the coordinates of the AR objects in the image and in the real world can be known. Based on the coordinates and the known camera focal length, the location at which the photograph was taken can be obtained. The location of the camera can be treated as the location of the user. The proposed positioning technique is very helpful in developing high-precision PNSs.