Scalable and Robust Video Encoding for Real-time Communication

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Scalable and Robust Video Encoding for Real-time
Communication

• Samah A. Senbel
• Advisor Dr. Hussein Abdel Wahab

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Outline

• Introduction Motivation
• Background
• A new Image Encoding Technique
• Quadtree-based Video Encoding Technique
• Octree-based Video Encoding Technique
• Differential Octree-based Video Encoding
  Technique
• Experimental results

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Introduction Motivation

• The Requirements for a real-time encoding
  technique are
• Good Compression Ratio
• Simplicity
• Scalability
• Robustness
• Ease of decoding

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Introduction Motivation

• We developed these 4 Encoders
• Quadtree-based Image Encoder
• Differential Quadtree-based Video Encoder
• Octree-based Video Encoder
• Differential Octree-based Video Encoder

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Scalability
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Why do we need Scalability?

• Heterogeneous Receivers
• Low-bandwidth communication
• Distant Learning
• Mobile hosts
• Dealing with network traffic
• Better error control

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Background (Quadtree)
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Vector Quantization
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Overview of the Image Encoding Technique
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Step 1 Mean removal
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Step 2 Generate Quadtree
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Step 3 Vector Quantization

• The Quadtree data is then COMPRESSED using vector
  quantization
• Each level is encoded independently to reflect
  its importance.

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Decoding Technique

• Perform reverse vector quantization (table look
  up)
• Convert from Quadtree to array
• Add the means image

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Experimental results

• Robustness

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Experimental Results

• Robustness at 20 loss

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Differential Quadtree Encoding Technique
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Test Videos
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Compression results
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Scalability
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Robustness
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Octree
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The Octree Video Encoding Technique
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Encoding Technique
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Compression(1)

• MissA Encoded at 16 Kbps

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Compression(2)

• Football Encoded at 16 Kbps

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Robustness
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Differential Octree Encoding Technique
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Summary

• Main Objective
• Design a Video Encoder with these properties
• Good Compression
• Scalability
• Robustness
• Ease of Decoding

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Summary

• We developed these 4 Encoders
• Quadtree-based Image Encoder
• Differential Quadtree-based Video Encoder
• Octree-based Video Encoder
• Differential Octree-based Video Encoder