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Mpeg Family 簡介

Mpeg Family 簡介. 第六組 B88901124 呂孟庭 B88901078 廖彥鈞. What is Mpeg?. MPEG( Moving Picture Experts Group ) ISO 底下的工作群 1988 年成立 負責為數位音訊和視訊訂立標準. 100 倍. Mpeg 發展歷史.

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Mpeg Family 簡介

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  1. Mpeg Family 簡介 第六組 B88901124 呂孟庭 B88901078 廖彥鈞

  2. What is Mpeg? • MPEG( Moving Picture Experts Group ) • ISO底下的工作群 • 1988年成立 • 負責為數位音訊和視訊訂立標準 100倍

  3. Mpeg發展歷史 • Mpeg-1( 1992年11月 ) Mpeg-2( 1994年11月 )Mpeg-3( ??????????? ) Mpeg-4 Ver1 ( 1998年10月 ) Mpeg-4 Ver2 ( 1999年12月 )

  4. Mpeg-1 特性 • 儲存媒體的標準(光碟) • 解析度352X240(NTSC) • CBR( Constant Bit Rate )：1.5Mbps • 每秒30 個Frame • 缺點：解析度低 • YUV

  5. MPEG-1 YUV介紹 • 亮度變化＆色調變化 • RGB Format • YUV FormatY：亮度 U(Cr)：紅色色差 V(Cb)：藍色色差

  6. Mpeg-1 壓縮方式 • Block Based Motion Compensation( 只儲存影像的差異 )I(Intra) Frame：由DCT得到，Size最大P(Predictive) FrameB(Bidirectional) Frame I B B P • DCT Based Compression

  7. Mpeg-1 Motion Compensation • 12個Frame有一個 I Frame，間隔0.4SecIBBPBBPBBPBBIBBPBBP I BB P BB P BB P

  8. Mpeg-1 DCT • Discrete Cosine Transform • Source Encoding( 通常是破壞性 )和資料特性有關例：聲音( 20Hz~20KHz )

  9. Mpeg-1 ─ DCT(II)

  10. Mpeg-1 ─ DCT(III)

  11. Mpeg-1　─　Audio

  12. Mpeg-2(I) • 720X480( Mpeg-1 的 2 倍 ) • 60Frame/s( Mpeg-1 的 2 倍 ) • 以容量換取畫質 • YUV • HDTV( High Definition Television )、EDTV( Extended Definition Television)

  13. Mpeg-2(II) ─ Audio • AAC( Advanced Audio Coding )5.1聲道( 5聲道+低頻率效果音 )

  14. Mpeg-1 VS. Mpeg-2 3Mbps 80Mbps 5~10Mbps 1.38Mbps 6.5Mbps 0.88Mbps 352X288 1920X1152 720X576 352X288 720X576 720X576

  15. Mpeg-1 VS. Mpeg-2

  16. Mpeg-3 • 1920X1440 • 用途：HDTV和EDTV • 被Mpeg-2併倬

  17. Mpeg-1 vs. Mpeg-2

  18. MPEG4 • What’s different between MPEG4 and other MPEGs? • Why do we need MPEG4?

  19. MPEG4~目標 • 流通便利與高容錯性ex:Wireless Multimedia Application • 高互動性服務 ex: Video-on-Demand • 自然與合成物件的編碼ex:電影特效

  20. MPEG4 Feature～AVO AVO(Audio Visual Object) ˙是一種〝content-based coding〞的概念 ˙與物件可以有互動關係 ˙包含： ˙Natural Audio Object ˙Natural Video Object ˙SNHC (Synthetic- Natural Hybrid Coding) ˙Other (Text,Still Image…)

  21. Audio Object

  22. Audio Coding • Based on MPEG-2 AAC • Compatible to MPEG-2 AAC

  23. Video Object

  24. Video Object Coding • VLBV (Very low bit-rate Video) Coding • Generic MPEG4 Coding

  25. SNHC (Synthetic- Natural Hybrid Coding)自然/合成混合編碼

  26. ? We need ? Now we have BIFS

  27. Binary Format for Scene: BIFS數位場景描述 • 描述物件群組關係 • 描述物件空間與時間上的位置 • 描述物件屬性(如:是否可點選、點選後之反應)

  28. Logical structure of a scene

  29. MPEG-4 object-based architecture

  30. Resource • MPEG Home Page http://mpeg.telecomitalialab.com/ • MPEG-4 Industry Forum http://www.m4if.org/ • ISMA • http://www.isma.tv/

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