statistical characteristics of simple wyner-ziv frames jin-soo kim
TRANSCRIPT
Statistical Characteristics of Statistical Characteristics of
Simple Wyner-Ziv FramesSimple Wyner-Ziv Frames
Jin-soo KIM
2 J.S.Kim
Contents
Simple Stat. Char.s of Wyner-Ziv Frames Statistical Characteristics of Simple Frame Difference DCT Coefficients for Simple Frame Difference Spatial Reduction for WZ Encoder Spatial Reduction and DCT for WZ Encoder
Research Plan Q&A
3 J.S.Kim
Statistical Characteristics of Simple Frame Difference
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Simple Frame Difference for WZ frames
I I Iwz wz wz I
EncoderSide
- =Residualsignal
I Iwz
DecoderSide
Encoded bit stream
Recon.Residualsignal
MCFI SideInformation
WZDecoder
1 2 3 4
1 2 3
WZEncoder
[Aaron, Zhang, Girod, Asilomar 2002]
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Frame Difference for Simple WZI I Iwz wz wz I
Residualsignal
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Statistical Distribution
Luma
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Standard Deviations for Simple FD
Akiyo: Luma's STD = 2.8, Chroma's STD = 0.6, Y/C entropy=1.69, 1.0bits/pel
Stefan: Luma's STD = 35.6, Chroma's STD = 7.4, Y/C entropy=6.2, 2.7bits/pel
Coastguard: Luma's STD = 16.4, Chroma's STD = 1.6, Y/C entropy=5.7, 1.6bits/pel
300 Frames @ CIF, 30Hz
Foreman: Luma's STD = 16.5, Chroma's STD = 3.4, Y/C entropy=5.2, 1.9bits/pel
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DCT Coefficients for Simple Frame Difference
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Frame Difference for Simple WZ
I I Iwz wz wz I
wz
8x8 DCT
Residualsignal
[Aaron, Zhang, Girod, Asilomar 2003]
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Std Dev of DCT Coeff For Simple FD
Std. dev.
DCT coeff. in zig-zag scan order
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Spatial Reduction for WZ Encoder
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Blk Diagram for Spatial Reduction WZ Enc.
2:1 decimation2:1 decimation
Current frame(WZ frame)
2:1 decimation2:1 decimation
Rec. Frame store(Key frames)
Regular Frame
Coder (ex. H.264)
Regular Frame
Coder (ex. H.264) 2:1 interpolation2:1 interpolation
++
-
Residualsignal
LR bit stream
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Block Diagram for Simulation
LPF & 2:1 decimation
LPF & 2:1 decimation 2:1 interploation & LPF 2:1 interploation & LPF
Integer QuantInteger Quant
-- ==Residualsignal
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Std Dev for Residual Signal
Stefan: Luma's STD = 12.1, Chroma's STD = 1.0, Y/C entropy=4.7, 0.5bits/pel
Coastguard: Luma's STD = 10.4, Chroma's STD = 1.6, Y/C entropy=4.8, 1.0bits/pel
300 Frames @ CIF, 30Hz
Foreman: Luma's STD = 9.1, Chroma's STD = 1.0, Y/C entropy=3.8, 0.5bits/pel
Stefan: Luma's STD var = 35.6, Chroma's STD = 7.4, Y/C entropy=6.2, 2.7bits/pel
Coastguard: Luma's STD = 16.4, Chroma's STD = 1.6, Y/C entropy=5.7, 1.6bits/pel
Foreman: Luma's STD = 16.5, Chroma's STD = 3.4, Y/C entropy=5.2, 1.9bits/pel
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Spatial Reduction and DCT for WZ Encoder
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Spatial Reduction and DCT for WZ Enc.
2:1 decimation2:1 decimation
Current frame
2:1 decimation2:1 decimation
Rec. Frame store
Regular Frame
Coder (ex. H.264)
Regular Frame
Coder (ex. H.264) 2:1 interpolation2:1 interpolation
++
-
ResidualsignalDCTDCT
[HP report by Mukherjee, Machiavello, Queiroz, 2007]
LR bit stream
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Std Dev of DCT Coeff For Spatial Reduction
Std. dev.
DCT coeff. in zig-zag scan order
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Comparison of DCT and DCT+Spatial Reduction
Std. dev.
DCT coeff. in zig-zag scan order
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Conclusion
Need to find an efficient statistical model for the residual signal
Need to look for entropy coding based on the trade-off between computational complexity and R-D performance
Need to implement the channel encoding/decoding algorithm
Need to develop an effective reconstruction scheme for side information
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Research Plan (with M.S. Vidhya Murthy)
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plan(Aug.2008 – June 2009)
8 9 10 11 12 1 2 3 4 5 6
▣ Simulation Environment and survey WZ CODEC
- survey WZ CODEC
- joint simulation model of H.264 CODEC
▣ Survey of Channel Coding Algorithm
- channel coding/decoding algorithm
- analysis of channel source code
▣ Implementation of Wyner-Ziv CODEC
- Performance comparison of Pixel- and Transform-domain
- Investigate the statistical characteristics and distributions of
the residual signal
- Efficient encoding algorithm (Quantization/Entropy coding or
Slepian-Wolf encoding/decoding)- Efficient generation of Side Information- Implementation of channel encoding/decoding algorithm- Rate control (or buffer control) algorithm
■ ■ PlanPlan and achievementsand achievements■ ■ PlanPlan and achievementsand achievements
Research Plan Plandone
Now
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Q&A
Thank you