博碩士論文 etd-0711112-215520 詳細資訊


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姓名 宋翊誠 (Yi-Cheng Sung) 電子郵件信箱 squalllucky@gmail.com
畢業系所 電機工程學系研究所(Electrical Engineering)
畢業學位 碩士(Master) 畢業時期 100學年第2學期
論文名稱(中) 在TCP網路中實作多重影像監控的整合機制         
論文名稱(英) Implementations of a Merging Mechanism for Multiple Video Surveillances in TCP Networks
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    摘要(中) 本論文在TCP網路的監視系統中,提出一個多重影像的整合機制,希望能藉由監控影像的整合來提升監控人員的監控效益,同時減少不必要的頻寬浪費,在此機制中我們在Cameras與監控中心之間設計了一台VMG (Video-Merging Gateway),由VMG將Cameras傳送的Video Streams進行多重影像的整合,並將整合後的Video Stream傳送回監控中心播放,我們提出的多重影像整合分成Interleave和Overlay兩種模式,其中Interleave的整合又分為Single Frame和Proportional兩種模式。 Single Frame為Cameras的畫面以單張交錯的方式進行合併,Proportional為Cameras依照使用者需要之整合比例進行FPS (Frames per Second)的分配;Overlay則是Cameras的畫面在監控中心的瀏覽器中,以上下區塊的排列方式進行播放。我們在Linux平台進行VMG的實作,為了完成Interleave的整合模式,當兩條以TCP協定傳送的Video Streams進行合併時,我們必須對Data封包和Ack封包的Sequence Number和Ack Number進行重新計算,並且替合併時捨棄的Frames創造Ack封包;為了完成Overlay的整合模式,我們必須修改Frames的解碼資訊,並將Frames之間的解碼資料進行區隔,以防止其互相影響而造成解碼錯誤。最後我們對整合機制的演算法進行複雜度的分析,由「創造Ack封包」和Retransmission Time Out (RTO)的關係中,我們找出創造Ack封包的時間限制,藉此避免Data封包發生Time Out和重傳。另外,我們發現當進行Interleave整合時,執行演算法的指令數目會隨著Picture Sizes的增加而呈倍數成長;而進行Overlay整合時,其指令數目則會隨著Payload的長度、Data和Ack封包的總數增加而呈現線性增加。
    摘要(英) This thesis proposes a merging mechanism for multiple video surveillances in TCP networks. Merging video streams not only can benefit network administration but also reduce the waste of bandwidth. In this thesis, we design a Video-Merging Gateway (VMG) between cameras and control center to merge two video streams transmitted from cameras and received by control center. In the merging mechanism, we develop two modes: Interleave and Overlay. Interleave mode includes two operation types: Single Frame and Proportional. The former merges video streams by interleaving frames one by one from two cameras, and the latter merges video streams according to an FPS (frame per second) ratio between two cameras. Overlay mode vertically displays two video streams in separate frames on the web browser. We implement VMG on a Linux platform. In the interleave mode, we recalculate both the sequence number and the Ack number of a video packet, and create Ack packet for dropped frames while merging two TCP video streams. In the overlay mode, we modify the decoding messages in the frames and separate data between two video streams to avoid decoding errors. Finally, we analyze the complexity of merging algorithms. By carefully determining the timing for responding the created Ack based on Retransmission Time Out (RTO), packet retransmition can be avoided. In addition, we found out that the number of instructions to execute the algorithm is increased by multiple integers along with the picture sizes under interleave mode. As for overlay mode, the number of instructions is increased linearly along with the payload length and the total amount of data and Ack packets.
    關鍵字(中)
  • 監控系統
  • 關鍵字(英)
  • Overlay
  • Interleave
  • Merge
  • Video Stream
  • Video Surveillance
  • 論文目次 第一章 導論............1
    1.1 研究動機............1
    1.2 研究方法與步驟............2
    1.3 章節介紹............4
    第二章 多重影像監控............5
    2.1 IVS............5
    2.2 M-JEPG介紹............8
    2.3 Video Streams整合的相關研究............10
    2.3.1 Video Stream的Overlay與Interleave............10
    2.3.2 多條Video Streams的Merge............11
    2.3.3 各種機制的比較............14
    2.4. 本論文提出的機制............15
    第三章 多重影像的整合機制............16
    3.1 系統架構............16
    3.2 Control Packets............17
    3.3 不同整合模式的流程............18
    3.4 Interleave的整合............20
    3.5 IP與TCP Header欄位的更改............22
    3.6 SN與Ack Number的順序調整............24
    3.7 Overlay的整合............32
    第四章 Linux實作與結果分析............35
    4.1. 實驗環境與設備規格............35
    4.2. Linux平台上的實作............37
    4.2.1 Control Packet的處理............37
    4.2.2 Interleave的整合模式............39
    4.2.3 Overlay的整合模式............48
    4.3 實作的結果與量測............51
    4.3.1 Interleave的實作結果............53
    4.3.2 Overlay的實作結果............53
    4.4 演算法的分析............55
    4.4.1 「創造Ack封包」與RTO............55
    4.4.2 分析演算法的時間複雜度............58
    4.4.3 實際量測與驗證............62
    第五章 結論與未來工作............64
    5.1 結論............64
    5.2 未來工作............66
    參考文獻............67
    Index............71
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    口試委員
  • 李宗南 - 召集委員
  • 賴威光 - 委員
  • 黃國勝 - 委員
  • 黃宗傳 - 委員
  • 許蒼嶺 - 指導教授
  • 口試日期 2012-07-04 繳交日期 2012-07-11

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