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H.264 畫框層級之快速模式決策方法

H.264 畫框層級之快速模式決策方法. 研究生：李明峰 指導教授：蔣依吾 博士. 中山大學資訊工程學系 http://image.cse.nsysu.edu.tw/. Outline. H.264/AVC Mode Decision Frame-Based Fast Mode Decision Method Experimental Results. H.264/AVC. Description Advantage & Disadvantage. H.264/AVC Description. ITU-T VCEG

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H.264 畫框層級之快速模式決策方法

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  1. H.264畫框層級之快速模式決策方法 研究生：李明峰 指導教授：蔣依吾 博士 中山大學資訊工程學系 http://image.cse.nsysu.edu.tw/

  2. Outline • H.264/AVC • Mode Decision • Frame-Based Fast Mode Decision Method • Experimental Results

  3. H.264/AVC Description Advantage & Disadvantage

  4. H.264/AVC Description ITU-T VCEG Video Coding Experts Group H.264 JVT Joint Video Team H.264/AVC ISO/IEC MPEG Moving Picture Experts Group MPEG-4 Part-10 AVC Advanced Video Coding

  5. H.264/AVC Description • 2003/5 final drafting completed • 2005/3 Fidelity Range Extensions ITU-T Standards H.261 H.263 H.263+ H.263++ Joint ITU-T/MPEG Standards H.262 MPEG-2 H.264 MPEG Standards MPEG-1 MPEG-4 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 1984

  6. H.264/AVC Description 1990 2000 H.261 H.263 ++ H.26L H.264 H.262 ITU-T JVT AVC Same High level of commonality ISO / IEC MPEG-1 MPEG-2 MPEG-4 Part 10 Part 2 Real Video, WMV, On2, Divix, … Proprietary VC-9 SMPTE

  7. Advantage Good video qualityLow bit rates Resolution Bit rates Broadcast DVD storage RTP/IP packet networks multimedia telephony systems Flexibility

  8. Disadvantage • Complexity High Profile High 10 High 4:2:2 High 4:4:4

  9. 編碼時間

  10. Mode Decision Intra-mode decision Inter-mode decision

  11. Mode Decision • Block Base • Intra-mode • Inter-mode

  12. Intra-Mode Decision

  13. Intra-Mode Decision 4*4 horizontal 16*16 plane

  14. Intra-Mode Decision 處理後的圖 原圖

  15. Inter-Mode Decision Current Frame Reference Frames

  16. Inter-Mode Decision 方塊 位置 Motion Vector Current Frame Reference Frame

  17. A A A 不分割 巨區塊 B B B C 分成兩個16*8的區塊 C C

  18. Inter-Mode Decision

  19. Mode Decision

  20. Frame-Based Fast Mode Decision Method Flow Description The Method

  21. 概念圖 前置處理 Current frame Previous frame 演算法本體 MB的模式 H.264處理

  22. 概念圖 前置處理 分群 演算法本體 正規化 H.264處理

  23. 分群 4*4 sub macro block SNR 最高細節度 高細節度 中細節度 低細節度 最低細節度 m4 m5 m1 m3 4*4Block SNR 的平均值

  24. Current frame 5 frames Previous frame

  25. Current frame 5 frames Previous frame 4 Pixels

  26. Frame Difference Frame Difference Frame Difference Frame Difference Frame Difference 5 frame differences

  27. 53 Frame Difference 54 37 42 41 Frame Difference Frame Difference Frame Difference Frame Difference 53 47 40 36 49 44 33 47 46 38 57 63 72 59 70 74 71 60 69 75 58 68 65 70 76 5 frame differences

  28. Frame Difference 53 54 37 42 41 Frame Difference Frame Difference Frame Difference Frame Difference 53 47 40 36 49 44 33 47 46 38 57 63 72 59 70 74 71 60 69 75 58 68 65 70 76 34 67 58 83 34

  29. Frame Difference 52 54 33 40 38 53 47 34 35 48 44 33 44 43 36 49 52 43 43 46 36 61 45 47 38 56 47 45 38 34 對所有值加以平均，得到m1值

  30. 最高細節度 m4 m2 高細節度 m5 中細節度 m1 低細節度 m3 最低細節度

  31. Frame Difference 52 54 33 40 38 53 47 34 35 48 44 33 44 43 36 49 52 43 43 46 36 61 45 47 38 56 47 45 38 34

  32. 正規化

  33. 正規化 細節 高 細節 低 細節 低 細節 低 細節 高 細節 高 細節 高 細節 高

  34. 最佳解的可能性 A A A B 巨區塊 分成兩個16*8的區塊 B B C C C 不分割 C

  35. 輸出 最高細節度 高細節度 高細節度 中細節度 中細節度 低細節度 低細節度 最低細節度

  36. Experimental Results JM10.2 Fast mode decision Compared with JM

  37. JM10.2 Fast mode decision • Homogeneous Regions DeterminationEdge detection (Sobel operator) • Stationary Regions DetectionSAD (previous MB and present MB)

  38. FFMD FFMD SnrY BitRate FFMD ME time

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