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Everything you always wanted to know about JPEG2000 compression, the benefits, the main features, the implimentation...

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about jpeg2000
About JPEG2000
  • New image coding system based on wavelet technology
  • In 2004, it was selected as the mandatory compression format for Digital Cinema
slide3

License-free

    • Improved Compression Efficiency
    • Mathematically Lossless Compression
    • Graceful Degradation
    • Scalability
    • Dynamic Bandwidth Allocation
    • Robust Transmission
    • Easy Post-Production
    • Region of Interest (ROI)
    • Low Latency
    • Constant Quality through Multiple Generations
    • Encoding - Decoding Processing Power
    • Open Standard
slide4
License-Free
  • The JPEG committee has stated:
    • “Standards should be implementable without payment of royalty and license fees”
    • “Agreements have been reached with over 20 large organizations to allow use of their IP without payment of license fees or royalties”
mathematically lossless compression
Mathematically Lossless Compression
  • It enables a reduction in storage requirement of, on average, 1:2 while still being able to recover the exact original image information.
  • Extremely important feature in fields such as digital archiving, cinema acquisition and medical imaging.
  • Unique advantage in comparison to JPEG, MPEG2, MPEG4
graceful degradation
Graceful Degradation
  • In JPEG 2000 the effect of image compression is a soft blur on high-frequency areas

Image compressed with JPEG 2000 with a compression ratio of 400:1

Image compressed with JPEG 2000 with a 2:1 compression ratio

scalability
Scalability
  • JPEG 2000 is able to extract multiple versions out of a single compressed file
  • This scalability provides
    • Easy proxy generation
    • Region of Interest
    • Bandwidth optimization and adaptative transmission
dynamic bandwidth allocation
Dynamic Bandwidth Allocation
  • JPEG 2000 scalability over highly variable channels (over-IP or Wireless) provides a powerful dynamic quality allocation.
    • Giving priority to fundamental data packets allows ‘best achievable quality’ for the available bandwidth
    • Increasing redundancy of fundamental data packets also guarantees a minimum image quality for weak signals
robust transmission
Robust Transmission
  • JPEG 2000 intrinsic robustness prevents having dramatic visual impact when packets are missing or corrupted
  • JPEG 2000 intra-frame nature gives another advantage to long-GOP formats: it limits the impact of the missing or corrupt packet to a single frame
easy post production
Easy Post-Production
  • Easy-Proxy

From a single file editors can extract a proxy and use full resolution image for the rendering chain

  • Easy Editing

Intra-frame coding enables editors to easily access each frame

region of interest roi
Region Of Interest (ROI)
  • JPEG 2000 is also able to prioritize a user defined area of the image, to which it will provide the full quality layer
low latency
Low Latency
  • Intra-frame allows every frame to be encoded independently allowing latency of less than 1 frame
  • In comparison, inter-frame encoding formats (e.g. MPEG2, MPEG4) need to work with Groups of Pictures (GOP) that require a longer processing time…….
  • Low latency is a critical consideration in many applications………………..
constant quality through multiple generations
Constant Quality Through Multiple Generations
  • Successive encoding-decoding passes are usually required throughout the Broadcast and Digital Cinema post-production processing chain
  • JPEG 2000 provides a constant image quality throughout the production process
processing power
Processing Power
  • JPEG 2000 is a symmetrical compression technology requiring approximately the same processing power to encode or to decode at any compression quality
  • The JPEG 2000 standard supports every resolution, color depth, number of components and frame rate
  • It is the image compression format most ready to address future applications

Open Standard

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Pre-Processing
  • Wavelet Transform
  • Compression
  • Rate Control
  • Data Ordering
pre processing
Pre-Processing
  • The pre-processing block mainly deals with color conversion (or decorrelation):
    • RGB  YCbCr (Irreversible Color Transform)
    • RGB  YUV (Reversible Color Transform)
the discrete wavelet transform
The Discrete Wavelet Transform
  • Components are passed recursively through low and high pass Wavelet filters
  • This enables an intra-component de-correlation that concentrates the image information in a small and very localized area and multi-resolution image representation
compression of the wavelet coefficients
Compression of the Wavelet Coefficients
  • By itself the Wavelet Transform does not compress image data; it restructures the image information so that it is easier to compress
  • Once the Discrete Wavelet Transform (DWT) has been applied, the output is quantized. The quantized data is then encoded in the Entropy Coding Unit (ECU)
rate control
Rate Control
  • Given a targeted bit-rate, the Rate-Control module adjusts the coding precision of each pixel (small groups of pixels called code-blocks)
  • It embeds all groups of pixels in a succession of Packets. These Packets, along with additional headers, form the final JPEG 2000 code-stream
  • In the last ‘data ordering’ block the preferred scalability (or progression order) is selected

Data Ordering

the implementation
The Implementation
  • intoPIX provides the most flexible and powerful range of JPEG 2000 implementations available
  • intoPIX efficient image processing allows implementation on a single FPGA
  • intoPIX technology currently addresses Digital Cinema and Broadcast markets.
  • Since 2004 intoPIX founders have been the editors of the reference open source code - openJPEG: www.openjpeg.org

www.intopix.com