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Text File  |  1993-01-24  |  1.2 KB  |  39 lines
  1. Newsgroups: comp.compression
  2. Path: sparky!uunet!munnari.oz.au!uniwa!bilby.cs.uwa.oz.au!wambenger!peterb
  3. From: peterb@cs.uwa.oz.au (Peter Bousfield)
  4. Subject: JPEG compression
  5. Message-ID: <peterb.727926960@wambenger>
  6. Summary: Where is most of the compression achieved?
  7. Keywords: JPEG, compression
  8. Sender: usenet@bilby.cs.uwa.edu.au
  9. Nntp-Posting-Host: wambenger
  10. Organization: Dept. Computer Science, University of Western Australia.
  11. Date: Mon, 25 Jan 1993 01:56:00 GMT
  12. Lines: 25
  13.  
  14. Hello fellow compressors,
  15.  
  16. It is my understanding that JPEG compression
  17. works in basically two parts.
  18. Step 1: DCT (Discrete Cosine Transform)
  19. and
  20. Step 2: Huffman Coding (for those of us
  21.             who don't wish to
  22.             pay for a license.)
  23.  
  24. I was wanting to know which of these
  25. two steps contributes more to the compression.
  26. That is, how good is the compression without
  27. Huffman coding (eg is it 50% worse or only 10%
  28. worse.)
  29.  
  30. Thankyou
  31.  
  32. peterb
  33. ----------------------------------------------------------------------
  34.   Peter Bousfield           ,-_|\     E-mail: peterb@cs.uwa.edu.au
  35.   285 Robinson Ave         /     \    
  36.   Cloverdale, WA 6105   -->*_.-._/    Honestly, it was not me!!!
  37.   Australia                     v
  38. ----------------------------------------------------------------------
  39.