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Transform Domain Distributed Video Coding - PowerPoint PPT Presentation

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Transform Domain Distributed Video Coding
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  1. Transform Domain Distributed Video Coding

  2. Outline • Another Approach • Side Information • Motion Compensation

  3. Another Approach • 8X8 DCT • Divided into low frequency & high frequency • Low frequency - Wyner-Ziv Coding • High frequency - run-length & Huffman

  4. High Frequency • Store quantized high frequency coefficient of previous frame • Calculate distance between previous frame and current frame • If the distance smaller than a threshold, send “no high frequency bits” • If the distance exceeds the threshold, compress coefficient using run-length and Huffman

  5. Side information • Interpolation • Extrapolation • Motion estimation • Pixel value

  6. Side Information

  7. Side Information

  8. Motion Compensation • Motion-compensated interpolation (MC-I)using the decoded Key frame at time t-1 & t+1

  9. Motion Compensation

  10. Motion Compensation • Motion-compensated extrapolation (MC-E)estimate the motion between the Wyner-ziv frame at time t-2 and the Key frame at time t-1

  11. Low complexity Motion Compensation • Average interpolation (Avg-I)side information generate by averaging the pixel value from the key frames at t-1 & t+1 • Previous Frame Extrapolation (Prev-E)previous key frame is used directly as side information