A New Coding Mode for Error Resilient Video

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A New Coding Mode for Error Resilient Video

• EE368C Final Presentation
• Stanford University
• Sangoh Jeong

Mar.8, 2001
2
Outline

• Use of Leaky Prediction RD theory for Improved
  Error Resiliency
• General Hybrid Video Codec
• Proposed New Coding Mode
• RD-Based Mode Selection
• Experimental Environment
• Results

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Data Units

• GOB(Group Of Block)s, MB(Macroblock)s
• and Blocks
• - Example For QCIF(9GOBs),

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General Hybrid Video Codec
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The Leaky-Inter Mode

• Prediction Error
• Leaky Prediction
• Attenuates the energy of the prediction signal
• Superimposed errors decay over time
• Encoding of Intra ,
  Inter

Reconstructed Frame
Original Frame
MB1
MB2
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RD-Based Mode Decision

• Cost Function Decision Process
• Intra Mode
• Inter Mode
• Leaky-Inter Mode
• Value of

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Encoder Setup
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Encoder and Experiment

• Encoder Software Used
• H.263 Encoder V2.0 (TMN-8)
• RD-Based Mode Decision Realized for Experiment
• Error Resiliency Experiment
• Effect of Leaky-Inter Mode
• - Case1 Operation Without Errors, regarding
  values
• - Case2 Operation With Errors, regarding
  values
• Effect of Leaky-Inter Mode with Assumed Feedback
• - 3-Mode Operation with Errors, regarding an
  

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Conditions on Experiment

• The Pattern of Errors
• GOB Loss rate 6.67
• Random Burst Loss of 3 GOBs / 5(average)
• decoded frames.
• Same positions of errors applied to all
  experiments For Comparison
• Assumption
• Encoder knows the state of the decoder accurately
• Error Concealment
• GOB Concealment from Previous Frame for Errors

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L-Inter Intra Result
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L-Inter Intra Result (Error case)
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Resiliency in case of Feedback
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Conclusion Future Work

• Improved resiliency
• Less coding efficiency
• Not so helpful with accurate feedback
• Further Experiment
• Encoder knows only the region of errors of the
  decoded video as feedback information
• Encode the region of errors with the Leaky-Inter
  Mode
• Future work
• Find the leaky-coefficient( ) methodically
• Experiment with realistic transmission channels