Wyner-Ziv Coding of Motion VideoPresented by fakewen

Author

Ann Aaron Bernd GirodRui  Zhang

outline

• Introduction• Wyner-Ziv Video Codec

– Quantization– RCPT-based Slepian-Wolf Coder– Side Information and Statistical Model– Reconstruction Function

• Results• Conclusion

introduction

Wyner-Ziv Video Codec

outline

• Introduction• Wyner-Ziv Video Codec

– Quantization– RCPT-based Slepian-Wolf Coder– Side Information and Statistical Model– Reconstruction Function

• Results• Conclusion

Quantization

• uniform scalar quantizer with 2M levels to quantize the pixels of X2i .

• Each quantizer bin is assigned a unique symbol.

outline

• Introduction• Wyner-Ziv Video Codec

– Quantization– RCPT-based Slepian-Wolf Coder– Side Information and Statistical Model– Reconstruction Function

• Results• Conclusion

RCPT-Based Slepian-Wolf Codec

Y2iScalar

QuantizerTurbo

Encoder Buffer Turbo Decode

rRequest bits

Slepian-Wolf Codec

• Uniform scalar quantizer• RCPT Slepian-Wolf Codec

Flexibility for varying statisticsEmbedded puncturing patternBit rate controlled by decoder through feedback

Decoded quantizedsymbols

Y

Even frame

X

outline

• Introduction• Wyner-Ziv Video Codec

– Quantization– RCPT-based Slepian-Wolf Coder– Side Information and Statistical Model– Reconstruction Function

• Results• Conclusion

Side Information and Statistical Model

• = • Average Interpolation.• motion compensated (MC) interpolation • symmetric motion vectors (SMV

Interpolation)

Side Information and Statistical Model(cont.)

• pixel from the current frame• Side information • Laplacian random variable.

outline

• Introduction• Wyner-Ziv Video Codec

– Quantization– RCPT-based Slepian-Wolf Coder– Side Information and Statistical Model– Reconstruction Function

• Results• Conclusion

Reconstruction Function

outline

• Introduction• Wyner-Ziv Video Codec

– Quantization– RCPT-based Slepian-Wolf Coder– Side Information and Statistical Model– Reconstruction Function

• Results• Conclusion

Carphone Sequence

6 dB

2 dB

8 dB

Foreman Sequence

7 dB

4 dB

7 dB

Foreman sequence

Side information SMV Interpolation

After Wyner-Ziv Coding16-level quantization (~1 bpp)

Sample Frame

Side information SMV Interpolation

After Wyner-Ziv Coding16-level quantization (~1 bpp)

Sample Frame

Side information Average Interpolation

After Wyner-Ziv Coding16-level quantization (~1 bpp)

Carphone sequence

H263+ Intraframe Coding 410 kbps

Wyner-Ziv Codec SMV Interpolation 384

kbps

Conclusion• Use Wyner-Ziv coding for practical compression

application– Used statistics of the source

• New video system– Intraframe encoder – Interframe Decoder

• Compared to H263+– 2 to 7 dB better than Intraframe coding(i-i-i-i)– 5 to 8 dB worse than Interframe coding with

MC(i-b-i-b)

The end

• Thank you!