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題名 | Development of a Free-Hand Pointer Using an Active Stereo Vision System=使用主動式立體視覺系統發展一個徒手指向器 |
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作者 | 洪一平; 陳永昇; 楊曜聰; 謝英博; 傅楸善; | 書刊名 | 電腦學刊 |
卷期 | 10:1 1998.03[民87.03] |
頁次 | 頁15-26 |
分類號 | 312.1 |
關鍵詞 | 立體視覺; 主動式視覺; 視訊追蹤; 徒手指向器; Stereo vision; Active vision; Visual tracking; Free-hand pointer; |
語文 | 英文(English) |
中文摘要 | 在人與電腦的互動介面中,雙手扮演著非常重要的角色。我們最終目標是希望使 用者不需藉助任何手握的工具即可用雙手與電腦溝通,在此一研究中,我們利用一個主動式 立體視覺系統來追蹤使用者的食指,並發展出一個徒手指向器,可以不須事先假設手指的長 度或寬度是已知的。我們首先使用主動式立體視覺系統取得一對立體影像,再由影像中偵測 出指尖在影像中的位置及手指在影像中的方向,最後再利用攝影機參數推算出手指在三度空 間中的位置與方向。在本系統中,我們提供了兩種操作模式:「手指本身的指向模式」和「眼 睛至手指的指向模式」。根據實驗結果,我們傾向於使用較穩定的「眼睛至手指的指向模式」。 為了使手指的活動範圍可以不受到相機視野的限制,我們採用主動式立體視覺的方法,使攝 影機能夠隨著手指的運動而轉動。實驗證實主動式立體視覺的技術可以用來發展具有實用價 值的徒手指向器。 |
英文摘要 | Human hands play an important role in human-computer interface. It will be most desirable if the user is allowed to use his free hands to communicate with the computer without holding or touching any physical tool. In this work, we have developed a system of free-hand pointer by tracking the index finger with an active binocular vision system. Here, we do not need any assumptions on the length and width of finger. Both the fingertip and the finger orientation in the left and right images obtained with the binocular vision system are detected. Then, the 3D finger position and direction are computed by using the camera parameters of the vision system. Our free hand pointer can be operated in two modes when computing the projection direction: the finger-orientation mode and the eye-to-fingertip mode. The experimental results favor the eye-to-fingertip mode for its robustness. In order to allow the finger to move in a wider 3D space without reducing the pointing resolution, we utilize a well-calibrated active stereo vision system which has a relatively small field of view but can control its stereo cameras to fixate at the moving finger. Our experiments have successfully demonstrated the feasibility of developing a free-hand pointer using an active binocular vision system. |
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