lec23 - 2 Burrows-Wheeler Transformation Example: CAT HAT...

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Outline Move to Front Transformation. Why? In- crease the frequency of reused code. Good for Huffman code. Burrows Wheelers Transformation. Why? Increase the probability of repeated combi- nations. Good for LZW algorithm. Lecture 22, Lempel-Ziv-Welch Compression p. 1
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Move to Front Transformation Example: ANNA BANANA code 0 1 2 3 ... 65 66 ... 78 ... 95 output char /0 ! $ ... A B ... N ... A A /0 ! $ ... B ... N ... 65 N N A /0 ! $ ... B ... ... 78 N N A /0 ! $ ... B ... ... 0 A A N /0 ! $ ... B ... ... 1 A N /0 ! $ ... B ... ... 95 B B A N /0 ! $ ... ... ... 68 (66+2) A A B N /0 ! $ ... ... ... 2 N N A B /0 ! $ ... ... ... 3 A A N B /0 ! $ ... ... ... 1 N N A B /0 ! $ ... ... ... 1 A A N B /0 ! $ ... ... ... 1 Lecture 22, Lempel-Ziv-Welch Compression p.
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Unformatted text preview: 2 Burrows-Wheeler Transformation Example: CAT HAT Cyclic order: C A T H A T A T H A T C T H A T C A H A T C A T H A T C A T A T C A T H T C A T H A C A T H A T Sorted order: C A T H A T H A T C A T A T C A T H A T H A T C C A T H A T H A T C A T T C A T H A T H A T C A Lecture 22, Lempel-Ziv-Welch Compression p. 3 Burrows-Wheel Reverse Transformation T T A H A C C H T A T A Lecture 22, Lempel-Ziv-Welch Compression p. 4...
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This note was uploaded on 07/17/2010 for the course CS 240 taught by Professor Ortiz during the Spring '09 term at Waterloo.

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lec23 - 2 Burrows-Wheeler Transformation Example: CAT HAT...

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