JPEG2000 in a nutshell

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A general overview of the JPEG2000 image compression codec as maintained on the www.openjpeg.org website.

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JPEG2000 in a nutshell

  1. 1. JPEG2000 in a nutshell B.Michel (Twist – UCL) 28/05/09
  2. 2. Discrete Wavelet Transform <ul><li>DWT = intra-component decorrelation </li></ul><ul><ul><li> concentrate image energy in a small area </li></ul></ul><ul><li>No blocking artefacts at high compression ratios </li></ul><ul><li>Enables multi-resolution image representation </li></ul>28/05/09 UCL/TELE - JPEG 2000  
  3. 3. JPEG 2000 features <ul><li>Improved compression efficiency </li></ul><ul><li>Lossy to lossless compression </li></ul><ul><li>Single compression / Multiple decompression </li></ul><ul><li>Progressive decoding </li></ul><ul><li>Scalability : </li></ul><ul><ul><li>Resolution </li></ul></ul><ul><ul><li>Quality (SNR scalability) </li></ul></ul><ul><li>Region of Interest Coding (ROI) </li></ul><ul><li>Error Resilience </li></ul>28/05/09 UCL/TELE - JPEG 2000
  4. 4. Compression efficiency 28/05/09 UCL/TELE - JPEG 2000 JPEG 1:137 JPEG2000 1:137
  5. 5. Compression efficiency 28/05/09 UCL/TELE - JPEG 2000 JPEG 1:126 JPEG2000 1:126
  6. 6. Multiple decompressions 28/05/09 UCL/TELE - JPEG 2000 Compression Decompression storage
  7. 7. Progressive transmissions 28/05/09 UCL/TELE - JPEG 2000 Progression in resolution Compression Progression in quality Spatial Progression storage
  8. 8. Scalability : by resolution (1) 28/05/09 UCL/TELE - JPEG 2000
  9. 9. Scalability : by resolution (2) 28/05/09 UCL/TELE - JPEG 2000 + + 2.6 kBytes (1:100)
  10. 10. Scalability : by quality 28/05/09 UCL/TELE - JPEG 2000
  11. 11. Scalability : by quality (ctd) 28/05/09 UCL/TELE - JPEG 2000 1.6 % download 8.0 % download 2.2 % download 26.4 % download 100 % download
  12. 12. Region of Interest 28/05/09 UCL/TELE - JPEG 2000
  13. 13. Robustness to errors <ul><li>Embedded error : 16 bytes set to 0 in the middle of the compressed file </li></ul>28/05/09 UCL/TELE - JPEG 2000 JPEG JPEG2000
  14. 14. JPEG 2000 Overview 28/05/09 UCL/TELE - JPEG 2000 Pre- processing Wavelet Transform Quant. Coefficient bit model Arithmetic coding Data Ordering ROI Codestream Image Rate Control
  15. 15. Useful Concepts <ul><li>Code-block : each sub-band from each tile-component is partitioned into code-blocks. </li></ul><ul><li>Bit-plane : each code-block will be entropy-encoded independently bit-plane by bit-plane. </li></ul>28/05/09 UCL/TELE - JPEG 2000 MSB LSB Bit-plane i DWT
  16. 16. Data Ordering 28/05/09 UCL/TELE - JPEG 2000 Tile-body (Data) Main header EOC Tile- header Tile header Tile- header Tile- header Tile-body (Data) Tile-body (Data) packet header Code-block i Entropic Data P 1 P 2 P 3 P n … EPH SOP … <ul><li>Code block inclusion </li></ul><ul><li>Zero bit plane information </li></ul><ul><li>Number of coding passes </li></ul><ul><li>Data length </li></ul>Code-block n Entropic Data
  17. 17. Standardization Process <ul><li>J2K parts under development : </li></ul><ul><li>Part 8, JPSEC ( security aspects ) </li></ul><ul><li>Part 9, JPIP ( interactive protocols and API ) </li></ul><ul><li>Part 10, JP3D ( volumetric imaging ) </li></ul><ul><li>Part 11, JPWL ( wireless applications ) </li></ul>28/05/09 UCL/TELE - JPEG 2000
  18. 18. Compared side by side 28/05/09 UCL/TELE - JPEG 2000
  19. 19. Compared side by side 28/05/09 UCL/TELE - JPEG 2000
  20. 20. Error resilience examples 28/05/09 UCL/TELE - JPEG 2000
  21. 21. Multi-resolution example 28/05/09 UCL/TELE - JPEG 2000
  22. 22. OpenJPEG <ul><li>Open source JPEG 2000 coder and decoder </li></ul><ul><ul><li>Implemented in C language </li></ul></ul><ul><ul><li>Developed at UCL </li></ul></ul><ul><li>http://www.openjpeg.org/ </li></ul>28/05/09 UCL/TELE - JPEG 2000
  23. 23. Thank you ! <ul><li>And visit also : </li></ul><ul><li>www.twist-cluster.be </li></ul><ul><li>www.xdcinema.com </li></ul><ul><li>www.intopix.com </li></ul><ul><li>www.tele.ucl.ac.be </li></ul><ul><li>www.openjpeg.org </li></ul>28/05/09 UCL/TELE - JPEG 2000
  24. 24. References <ul><li>ISO, JPEG 2000 International Standard </li></ul><ul><li>Taubman, D. and Marcellin, M. (November 2001) JPEG2000: Image compression fundamentals, standards and practice , Boston, Kluwer Academic Publishers, 795 pgs. </li></ul><ul><li>Taubman, High performance scalable image processing with EBCOT, IEEE Trans. on Image processing , July 2000. </li></ul><ul><li>Rabbani, Joshi, An overview of the JPEG2000 still image compression standard , Signal processing: Image communication 17(2002) p 3-48. </li></ul><ul><li>Special issue on JPEG2000 , Signal Processing: Image Communication. Elsevier, Volume 17, Issue 1, January 2002 </li></ul>28/05/09 UCL/TELE - JPEG 2000

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