臺灣博碩士論文加值系統

本論文中，提出了在視訊鏡頭中使用3D矩量方法取得時間空間活動向量圖的方法。傳統的影片分類方法是將影片分割成影像片段後，再對於每一影像片段之關鍵畫面進行分類，並沒有考慮到圖片之間的時間關聯性特徵。從影片中分割出的關鍵畫面，前後關鍵畫面間存在之物件運動特徵是行為分析的重要特徵，所以本論文提出先對視訊序列進行前處理，取得重疊之影像片段間的隱含運動向量特徵，結合原始影像資料，輸入以卷積神經網路為基礎之遞迴神經網路(recurrent neural network)進行視訊行為分析。
本論文主要分為兩大部分：取得視訊片段運動向量的資料前處理；結合原始影像資料，輸入以卷積神經網路為基礎之遞迴神經網路(recurrent neural network)進行視訊行為分析。運動向量資料前處理首先是將包含特定行為類別的視訊畫面切割成多個互相重疊的視訊片段。定義每個視訊片段之中間畫面為關鍵畫面，以關鍵畫面之邊緣點為中心，將每個視訊片段分成多個視訊立方體，並利用本論文提出之3D矩量方法擷取各個局部立方體中的物件時間空間特徵，其中之空間特徵表示物件之局部外型；時間特徵表示局部立方體之物件運動特徵，蒐集關鍵畫面各像素的時間空間特徵，我們建構關鍵畫面之時間空間特徵影像。本論文提出之前處理轉換視訊各畫面為相對應之關鍵畫面的時間空間特徵影像。利用這些轉換之時間空間特徵影像序列，輸入到遞迴神經網路(RNN)，進一步組合時間空間特徵序列影像，強化準確行為分析所需要的時間空間特徵。本論文提出之時間空間特徵影像表示法，可以提供以原始影像序列之進一步時間空間特徵，所以能夠有較準確的行為分析實驗結果。

This paper presents an approach to obtain the space-time motion vectors in a video shot using the proposed 3D moment method. The recognition of human activity in a video can be formulated as the problem of video classification by first segmenting the input video into video shots, estimating the activity scores of individual shots using a classifier, and accumulating the scores of consecutive shots to determine the activity boundary. However, the accuracy of video classification degrades dramatically when time-related features, i.e. motion vectors or optical flows, across frames are not considered in the training procedure. This paper proposes an approach to embed the implicit motion vector map into individual frames of a video. This enlarges the number of channels of a frame from 3(4) to 6; the first three channels are the original RGB(RGB-D) data and the remainders are the three-dimensional space-time motion vector.
The effectiveness of the space-time motion features are first verified by a k-nnr-based video classifier which uses kernel-PCA to construct the activity voting dictionary for activity detection. Also the motion feature maps are embedded into video shots and used to train the recurrent neural network (RNN) for further analyzing the behavior in a video. Using the 3D moment method, the proposed video classifier includes the pixel-wise space-time motion vector which both considers the appearance changing and temporal motion of objects across frames in a video to achieve of the goal of improving the accuracy of human activity recognition and detection. Experimental results demonstrate the effectiveness of the proposed method in terms of recognition accuracy and execution speed.

一、 緒論 1
1.1 研究動機 1
1.2 研究背景 1
1.3 研究目的 2
1.4 研究方法簡介 2
1.5 論文架構 3
二、 相關研究 4
2.1 RGBD視訊處理 4
2.2 Tensorflow深度學習簡介 4
2.3 視訊人類行為分析 5
2.3.1 傳統方法 5
2.3.2 深度學習方法 6
三、 結合時間空間特徵之視訊行為分析方法設計 7
3.1 視訊片段活動圖 7
3.1.1 時間空間對稱模式檢測 8
3.1.2 產生視訊片段的活動圖 10
3.2 主要活動圖 11
3.3 4D人類行為識別 13
四、 利用遞迴神經網路(RNN)進行視訊行為分析 15
五、 實驗結果 18
5.1 實驗資料準備/實驗環境 18
5.2 取得運動向量 18
5.4 遞迴神經網路參數分析 20
5.5 使用遞迴神經網路(RNN)分類 22
5.6 實驗結果比較 24
5.7 問題探討 24
六、 結論與未來展望 26
參考文獻 27

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