Optimal Mode Selection For Robust Video Transmission

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Optimal Mode Selection For Robust Video
Transmission

• EE368C Project Proposal
• Stanford University
• Sangoh Jeong

Feb.1, 2001
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Outline

• Goals
• Existing Mode Decision Processes
• R-D Based Mode Selection
• Proposed New Coding Mode
• Proposed Experiment
• Project Schdule

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Goals

• Optimal Switching of Coding Modes
• Proposes an additional coding mode
• Considers the trade-off between coding efficiency
  and error resiliency
• Improves PSNR characteristic in error-prone
  environment
• Uses an intelligent encoder without feedback
• Decides the optimal mode with moderate complexity

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Mode Decision Processes

• Low Complexity Mode Selection
• Error-Free Environment
• Error-Prone Environment
• High Complexity Mode Selection

Intra mode if (A lt (SAD(x,y) 500))

• Minimize Lagrangian Cost Function

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Lagrangian Cost Function

• D SSD between the original MB and its Rec.
• R bitrate associated with choosing Mode

Rate R
Lines of constant J
Distortion D
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Proposed Mode Selection

• Cost Function of Each Mode
• Intra Mode
• Inter Mode
• In-Between Mode
• Value of
• Choose the Mode which has the mimimum .

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Operation Of In-Between Mode

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

MCed Frame
Intra Frame
MB1
MB2
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Proposed Experiment
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Experiment Conditions

• Types of Trasmission Errors to be used
• Burst Errors
• Random loss of 1 GOB in every two frame
• Random Bit Errors
• Randomize 5 of bits in each frame
• Encoder Software to be used
• H.263 (tmn10) encoder
• Mode decision
• - Low Complexity Uses threshold
• - High Complexity Uses Lagrangian cost
  function

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Expected Result
0
Two-mode switching
time(s)
Loss in signal-to-noise ratio of decoded video
signal after errors happen
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Project Schdule