Mpeg family

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    05-Dec-2014
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Transcript of Mpeg family

  • 1. VIDEO COMPRESSION & MPEG 0992970- 0992969- 0992965-
  • 2. Outline
    • VIDEO COMPRESSION
      • VIDEO CODING BASICS
      • MOTION COMPENSATION
    • MPEG FAMILY
      • MPEG-1 VIDEO standard
      • MPEG-2 VIDEO standard
      • MPEG-4
      • H.264
      • MPEG-7
  • 3. VIDEO COMPRESSION
    • Why do we use compression?
      • Temporal Redundancy
      • Spatial Redundancy
    time x y
  • 4. Two Stage Coding Process Stage 1 Stage 2
  • 5. Reducing Temporal Redundancy
    • Segment a frame into macroblocks, not search by pixels
    • Output energy( bit rate) is increased with the degree of temporal redundancy
    • Interframe coder ( only use temporal redundancy reduction)
  • 6. Reducing Spatial Redundancy
    • Using DCT coding
    • Intraframe coder (use only spatial redundancy reduction, only for current frame)
    • Hybrid( intra-/ inter - frame) coding method
  • 7. Motion Compensation
    • Often used and developed by MPEG family
    • frame
    • It is preceded by motion estimation
    Motion Vector Search Range Current Frame Reference Frame
  • 8. MPEG-1 Introduction
    • DCT for intra- and inter- frames
    • Block-based motion compensation
    • Huffman Coding
    • Source input format : YUV, why not RGB
    • Y : luminance component( )
    • U(Cb), V(Cr) : color difference or chrominance component
  • 9. MPEG-1 Picture Type
    • Intra-Picture( I )
    • Predicted- Pictures( P )
    • Bidirectional-Predicted-Picture( B )
  • 10. MPEG-2
    • MPEG-1
    • Difference from MPEG-1
      • ( ex: RGB, more YUV form)
      • delay time
      • Higher bit rate
      • We can adjust our pictures quality
  • 11. MPEG-4
    • (Content-based)
    • Object-Based MPEG-1 MPEG-2
  • 12. Some MPEG-4 Video Feature
    • Segmentation
    • Sprite
    • Tracking
  • 13. MPEG-1 vs. MPEG-2 vs. MPEG-4 3Mbps 80Mbps 5~10Mbps 0.88Mbps 6.5Mbps 1.38Mbps 720X576 1920X1152 352X288 720X576 720X576 352X288
  • 14. MPEG-1 vs. MPEG-2 vs. MPEG-4 Mpeg-4 Mpeg-2 Mpeg-1