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H.264/AVC

H.264/AVC. 指導教授 : 陽士萱 博士 學生 : 陳柏源 碩一 學號 : 93598022. Outline. Introduction Video coding 技術說明 H.264 技術說明 Conclusions 未來進度. Introduction. ITU-T （ International Telecommunications Union ， Telecommunications Standardization Sector ）

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H.264/AVC

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  1. H.264/AVC 指導教授:陽士萱 博士 學生:陳柏源 碩一 學號:93598022

  2. Outline • Introduction • Video coding技術說明 • H.264技術說明 • Conclusions • 未來進度

  3. Introduction • ITU-T （International Telecommunications Union，Telecommunications Standardization Sector） H.26x系列 ex:H.261、H.262、H.263、 H.264 (MPEG-4 part 10) • ISO/IEC（International Standardization Organization/International Electrotechnical Commission ) MPEG-x系列 ex:MPEG-1、MPEG-2、MPEG-4

  4. ITU-T規範和ISO/IEC MPEG標準的演進歷程

  5. Video coding技術說明 DPCM/DCT video encoder

  6. Frame partitions Macroblock partitions partitions 16x16 blocks 8x8 blocks 4x4 blocks

  7. Motion estimation Motion estimation/compensation

  8. Motion vector map(16x16 blocks，inter vectors)

  9. Motion vector map(4x4 blocks，quarter-pixel vectors)

  10. Integer，half-pixel and quarter-pixel motion estimation

  11. Frame1 Fram2 Residual (no motion compensation) Residual (16x16 block size)

  12. Residual (8x8 block size) Residual (4x4 block size) Residual (4x4 block size，half-pixel) Residual (4x4 block size，quarter pixel)

  13. Input frame Fn Reconstructed reference frame F’n-1

  14. Residual Fn-F’n-1 (no motion compensation) 16x16 motion vector

  15. Motion compensation reference frame Motion compensation residual frame

  16. DCT (Discrete Cosine Transform) • Two-dimensional 8x8 DCT transform • Inverse two-dimension 8x8 DCT transform

  17. Quantization

  18. Zig-Zag Scan And Run Length Encoding (RLE)

  19. DPCM/DCT video decoder

  20. H.264技術說明 H.264 Encoder

  21. Intra prediction

  22. Macroblock partitions

  23. 移動估算的精準度 motion vectors可以精確到1/4像素精準度，既有標準大多採用1/2像素精準度，只有最新的MPEG-4標準才提供1/4像素精準度。 • 多重參考畫面選擇 • Deblocking Filter

  24. H.264 Decoder

  25. Conclusions H.264之優點 • 最多節省50％位元速率：相較於H.263v2（H.263+）或是MPEG-4 Simple Profile，在相同編碼器最佳化的條件下，以H.264最多可節省50％的位元速率。 • 高品質視訊：無論位元速率的高低，H.264都提供穩定一致的良好視訊品質。 • 抗錯性（error resilience）：H.264提供多種必要工具，不但能處理封包網路的封包遺失，還能針對容易發生錯誤的無線網路，處理其中可能出現的位元錯誤。 • 網路友善性：透過網路適應層（Network AdaptationLayer），H.264位元串流很容易就能在不同網路上傳輸。上述優點使得H.264成為許多應用的理想標準，例如視訊會議和廣播視訊。

  26. 未來進度

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