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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 陳文進 | |
dc.contributor.author | Wan-Hsun Hu | en |
dc.contributor.author | 胡萬勳 | zh_TW |
dc.date.accessioned | 2021-06-15T00:15:46Z | - |
dc.date.available | 2009-06-30 | |
dc.date.copyright | 2009-06-30 | |
dc.date.issued | 2009 | |
dc.date.submitted | 2009-06-11 | |
dc.identifier.citation | [1] “H.264/MPEG-4 Part 10 White Paper.”From http://www.vcodex.com
[2] T. Wiegand et al.,“Overview of the H.264/AVC video coding standard,”IEEE Transaction on Circuits Systems for video technology, Vol. 13, pp.560-576, July 2003. [3] Atul Puri, Xuemin Chen, and Ajay Luthra,“Video coding using the H.264/MPEG-4 AVC compression standard,”Signal Processing: Image Communication Volume 19, Issue 9, pp.793-849, October 2004. [4] Iain E. G. Richardson, “H.264 and MPEG-4 Video Compression: Video Coding for Next Generation Multimedia,”John Wiley & Sons, Ltd. ISBN: 0-470-84837-5, 2003. Available: http://guohanwei.51.net/book/H.264_And_MPEG-4_Video_Compression.pdf [5] “Draft ITU-T Recommendation and Final Draft International Standard of Joint Video Specification, ITU-T Rec. H.264 and ISO/IEC 14 496-10 AVC,”Joint Video Team, Mar. 2003. [6] 畢厚杰,“新一代視頻壓縮標準—H.264/AVC,”人民郵電出版社, ISBN: 711513064, Mar. 2005. [7] Gao Shen, Lu Tie-Jun,“Fast mode decision algorithm in H.264 for video communications,”The 6th International Conference on OPAC: IEEE Press, pp.1015-1018, February 2005. [8] “FFmpeg:Multimedia solution with recording, converting, and streaming.”From http://ffmpeg.mplayerhq.hu/ [9] “X264:A free library for encoding H264/AVC video streams.”From http://www.videolan.org/developers/x264.html | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/41319 | - |
dc.description.abstract | 隨著公共跟家庭安全日益重要,為了安全的考量,在一個監視系統內,盡可能有越多的監視器監看特定的區域越好,但由於經濟上的考量,通常不會有足夠的頻寬可以傳送所有監視器影像,尤其在窄頻網路中更是如此。
為了處理這個問題,我們提出了一個解決方法:一個改良型的H.264編碼器,它可讓使用者用很少的頻寬去盡可能傳送更多的串流影像。改良型編碼器主要想法就是把所有影像縮小並集中在一個影像後傳送出去。因為我們只是要從監視器內知道特定環境內發生了什麼事,對於傳送過來的影像是不是高畫質並不重要,只要還看得清楚就好,所以傳送過來的影像應該是要小而不是要求高畫質。在畫質仍然夠清晰,不影響觀看流暢度前提之下,把這四個從網路監視器傳送的影像輸入到系統,先把每一個都縮小,然後組合起來成一個較大的影像後傳送出去,如此一來減少監控時傳輸畫面的頻寬需求,同時也在可忍受的失真範圍內。考慮到每一個影像的畫面速率都不一定相同,不可能在每段時間裡所有的區域都有畫面可以取得,我們再針對有些區域沒有取樣時加以處理,加快壓縮速度。最後,將組合後的影像用改良後的H.264編碼器壓縮,然後透過網路傳送出去。 在評估系統時,我們比較了沒有經過縮小跟組合的傳統網路攝影機跟透過系統壓縮後所需的頻寬,以及比較原始的跟改良型H.264編碼器的編碼速度。經由效能評估,可以證實我們提出的改良型H.264編碼器,可以在有限的硬體花費之下,在傳輸頻寬跟壓縮時間上擁有較傑出的效能。 | zh_TW |
dc.description.abstract | Public and home safeties are important in human life. For the sake of security, it is necessary to have as many monitors of the surveillance system as possible to monitor specific regions. However, there is usually not sufficient bandwidth of networks to return all video streams, especially in narrowband networks.
To solve this issue, we propose a modified H.264 encoder, which uses little bandwidth to transfer more video streams as possible. The key concept is to compress all input video streams into one. Because we just know what happens in specific regions, it is not imperative to store high-quality video. The video should be small size instead of precise. We shrink four observed videos to one-quarter and combine them into one as long as the quality is distinct and smooth enough. This way, it is able to reduce the needed bandwidth and have acceptable quality. Still, each video has different frame rate, it is impossible to get samples in all regions when sampling. We modify the original encoder to improve encoding time when some regions get no sample. Finally, we encode the combined image by using modified H.264 encoder. For evaluations, we compare the needed bandwidth of output generated by our system with that of traditional IP camera which is no scaling and combining on the input files, and the encoding time of modified encoder with that of original encoder. As confirmed by performance evaluations, the proposed modified H.264 encoder with limited hardware cost can achieve excellent performance in term of the bandwidth of transmissions and encoding time. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T00:15:46Z (GMT). No. of bitstreams: 1 ntu-98-R96922069-1.pdf: 1361588 bytes, checksum: 4cafc6fcea300965eebb5e84f813151d (MD5) Previous issue date: 2009 | en |
dc.description.tableofcontents | 口試委員審定書 i
致謝 ii 摘要 iii ABSTRACT iv 圖目錄 vi 表目錄 vii CHAPTER 1. 緒論 1 1.1. 背景 1 1.1.1. 監視系統 1 1.1.2. 視頻編碼標準 2 1.2. 動機 4 1.3. 章節介紹 6 CHAPTER 2. 相關工作 8 2.1. H.264 8 2.2. FFMPEG 12 2.3. X264 13 CHAPTER 3. 系統設計與實作 15 3.1. 系統架構 15 3.2. 實作功能 18 3.2.1. Video Sampling 18 3.2.2. Video Scaling and Video Combining 19 3.2.3. Video Encoder 20 CHAPTER 4. 效能評估 25 4.1. 測試環境及方法 25 4.2. 測試結果與說明 26 CHAPTER 5. 結論與未來工作 29 5.1. 結論 29 5.2. 未來工作 30 參考文獻 31 | |
dc.language.iso | zh-TW | |
dc.title | 針對窄頻網路傳送串流影像的改良型H.264編碼器 | zh_TW |
dc.title | A Modified H.264 Encoder to Stream Video for Narrowband Networks | en |
dc.type | Thesis | |
dc.date.schoolyear | 97-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 陳俊良,周承復 | |
dc.subject.keyword | 監視系統,窄頻網路,串流影像,H.264, | zh_TW |
dc.subject.keyword | Surveillance network,narrowband networ, | en |
dc.relation.page | 31 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2009-06-12 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 資訊工程學研究所 | zh_TW |
顯示於系所單位: | 資訊工程學系 |
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