Title page for etd-0711112-215520


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URN etd-0711112-215520
Author Yi-Cheng Sung
Author's Email Address squalllucky@gmail.com
Statistics This thesis had been viewed 5591 times. Download 1235 times.
Department Electrical Engineering
Year 2011
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Implementations of a Merging Mechanism for Multiple Video Surveillances in TCP Networks
Date of Defense 2012-07-04
Page Count 86
Keyword
  • Overlay
  • Interleave
  • Merge
  • Video Stream
  • Video Surveillance
  • Abstract 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.
    Advisory Committee
  • Chung-Nan Lee - chair
  • Wei-Kuang Lai - co-chair
  • Kao-Shing Hwang - co-chair
  • Tsung-Chuan Huang - co-chair
  • Tsang-Ling Sheu - advisor
  • Files
  • etd-0711112-215520.pdf
  • indicate access worldwide
    Date of Submission 2012-07-11

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