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  • 學位論文

動態視訊接圖系統

A Dynamic Scene Registration System

指導教授 : 林啟芳
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摘要


本論文提出一個動態視訊接圖方法,可針對具有移動物體之動態視訊影像進行接合。所提方法主要分為兩階段,分別為校正階段及操作階段。校正階段針對攝影機進行校正,首先我們以平均值(mean)模擬中位數值(median)的方法分別建立左、右視訊畫面穩定背景,並利用Powell方向集方法在穩定背景上找出左、右視訊重疊區域與旋轉角度後校正右攝影機的角度(本論文固定左攝影機,而對右攝影機進行校正)。右旋轉角度若過大(我們限定在 之內),使用者必須以手動方式調整右攝影機擺放角度。若旋轉角度在容忍範圍內,則針對重疊區域找出特徵點,以特徵點的對應關係換算出左、右視訊的轉換矩陣,並經由反轉換矩陣(inverse matrix)對全景圖之接縫處右邊的每一點像素建立出接合遮罩(mask),於操作階段快速接合使用。操作階段時,同樣對左、右視訊分別取得穩定背景後,先進行前、背景的分離處理(在本論文中所要分離出的前景是針對有跨越接縫線的前景)。之後將左、右視訊完整畫面,透過前一階段所建立之接合遮罩進行快速接合。至於前景部分,在左、右視訊畫面接合後將其重新置入,最後輸出完整之全景圖。實驗結果顯示本論文所提方法可解決動態視訊接圖問題。

並列摘要


A dynamic scene registration system is presented in this paper, which can be utilized to register two sequences of video images with moving objects. Firstly, calibration stage focus on the adjustment in view of the camera and find the register mask. Secondly, in operation stage, we use register mask to register two video images rapidly. After registering two images, we use post-processing to deal with the foreground which is across register line. Finally, we output the panorama image as result. Experiments are arranged for demonstrating the feasibility of the proposed approach.

參考文獻


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