JPEG 2000 Compression

JPEG 2000 compression doesn't use blocks. It works by extracting detail in the horizontal, vertical, and diagonal directions. Oversimplified, detail is the magnitude of the difference between adjacent pixels. Wikipedia has a very good explanation. JPEG 2000 is used for high quality video links, such as Digital Cinema.

 

FIRST pass through encoder.

  1. Original pic reduced to 1/4
  2. Horizontal detail
  3. Vertical detail
  4. Diagonal detail

SECOND pass through encoder

  1. Picture can make five passes!

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