Design and Implementation of PowerAware Video Codec Systems

1
Design and Implementation ofPower-Aware Video
Codec Systems

• Power-Aware Flexible Video Codec System
• Design Approach
• Reconfigurable DWT Processor
• Power-Aware MPEG-4 Video Encoder System
• Design Approach
• Full Search ME Processor
• Multi-Mode Content-Dependent ME Processor
• Content-Dependent DCTQ Processor
• Embedded Compression for Frame Buffer Access
• Multi-Mode Embedded Compression Engine

2
Research Topics (1/3)

• Full Search ME Processor
• Practical low-power Full Search ME implementation
• Ultra low power dissipation
• 13.5 mW _at_ 1.35 V, 20 MHz, for CIF 30fps
• 1.5 mW _at_ 1.2 V, 2.5 MHz, for QCIF 15fps
• Much lower than existing Full Search ME
  processors
• Even lower than most Fast Search ME processors
• Multi-Mode Content-Dependent ME Processor
• Further reduce the power dissipation with
  acceptable quality drop
• Multi-mode ultra low power dissipation
• 51.3 mW 8.5 mW _at_ 1.8 V, for CIF 30fps
• Better power awareness

3
Research Topics (2/3)

• Reconfigurable DWT Processor
• Efficient Reconfigurable DWT Processor for
  Flexible Video Codec Systems
• 10 to 100 times power efficiency higher than DSPs
• Higher flexibility and HW efficiency than prior
  arts
• Reconfigurable and Scalable DWT PE Array
• Based on more computation-efficient Lifting
  Scheme
• A systematic design method leads to regular
  lifting factorized structures
• Support forward/inverse transforms
• Support variable filter kernel
• Reconfigurable WPT Address Generator
• Support variable decomposition level/structure

4
Research Topics (3/3)

• Content-Dependent DCTQ Processor
• Practical and efficient Content-Dependent DCT and
  IDCT designs for power-aware video codec systems
• Based on prior two designs, overcome their
  drawbacks
• Content-Dependent DCTQ Processor
• Content-Dependent DCT design
• Content-Dependent IDCT design
• Conventional Q and IQ designs
• 2.05 mW (worse case) and 1.06 mW (normal case)
  for CIF 30 fps _at_ 1.8 V, 4.56 MHz
• With only less than 0.1 dB quality drop