A New Reference Design Development Environment for JPEG 2000 Applications

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A New Reference Design Development Environment
for JPEG 2000 Applications

• Bill FinchCAST, Inc.

Warren MillerAVNET Design Services
DesignCon 2003January 28,2003
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The Need for A New Standard

• Higher useful compression ratios to conserve
  bandwidth
• True loss less compression
• Faster processing of larger images
• Error resilience
• A single standard for all of the above

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JPEG 2000 Advantages

• Better image quality at the same file size
• 25-35 smaller file sizes at comparable image
  quality
• Good image quality even at very high compression
  ratios, over 801
• Low complexity option for devices with limited
  resources such as cell phones
• Scalable image files -- no decompression needed
  for reformatting
• Progressive rendering and transmission through a
  layered image file structure

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Block Diagram of the JPEG 2000 Core
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Considerations in Application Design

• Image size (s) to be processed
• Image composition (color, mono, grayscale)
• Throughput requirements
• Lossy vs. Loss less
• Target technology
• ASIC or FPGA
• Memory

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Trade Offs in a Design

• Speed vs. Area (and Memory)
• Standard allows for code-blocks to be
  entropy-coded/ decoded separately. So, parallel
  entropy coding engines can be employed to
  increase speed. This comes of course at the cost
  of extra memory and area
• Speed vs. Optimal Bit Rate Control
• The time spend in entropy coding can be reduced
  if less data are fed for entropy coding. This can
  be achieved by using higher quantization values.
  However, the bigger the quantization values the
  less optimization can be done by the bit-rate
  control algorithm

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Trade-Offs in a Design, cont.

• Programmability vs. Area
• Hardwiring the DWT-filter type (5/3 or 9/7), the
  quantization tables, and the entropy coding
  switches can help to reduce the area requirements
• Error resilience vs. Compression efficiency
• Error resilience mechanisms introduce small
  overheads in the final stream size

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The Need for a Reference Design

• Allows for the developer to learn to manage the
  trade offs in a known design
• Allows the developer to experiment with his/her
  own data
• Allows the developer to identify the
  hardware/software structure of an optimal design

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Why the Avnet Avalon Board

• It offers a large, high performance FPGA with
  sufficient internal memory
• It offers plenty of external memory expansion for
  non time critical buffering
• It offers a fast host interface
• Options for future expansion