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LZW Encoding

LZW Encoding. The input message was taken from: http://www-mtl.mit.edu/Courses/6.095/notes/LZW-examples.html. Input. Send. LZW Encoding. SEND. 256. i. 105. t. 116. Dictionary. t. 116. Index. Word. Index. Word. y. 121. 0. 258. it. _. 32. …. 259. tt. b. 98. i. 32. _.

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LZW Encoding

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  1. LZW Encoding The input message was taken from:http://www-mtl.mit.edu/Courses/6.095/notes/LZW-examples.html

  2. Input Send LZW Encoding SEND 256 i 105 t 116 Dictionary t 116 Index Word Index Word y 121 0 258 it _ 32 … 259 tt b 98 i 32 _ 260 ty t 258 … 261 y_ t 97 a 262 _b y 260 98 b 263 bi _ b 262 … 264 itt i 122 z 265 ty_ t 258 … 266 _bi _ 256 SEND 267 it_ b i 266 257 STOP 268 _bin n 110 STOP 257

  3. Input Send LZW Encoding SEND 256 i 105 t 116 Dictionary t 116 Index Word Index Word y 121 0 258 it _ 32 … 259 tt b 98 i 32 _ 260 ty t 258 … 261 y_ t 97 a 262 _b y 260 98 b 263 bi _ b 262 … 264 itt i 122 z 265 ty_ t 258 … 266 _bi _ 256 SEND 267 it_ b i 266 257 STOP 268 _bin n 110 STOP 257

  4. Input Send LZW Encoding SEND 256 i 105 t 116 Dictionary t 116 Index Word Index Word y 121 0 258 it it _ 32 … 259 tt b 98 i 32 _ 260 ty t 258 … 261 y_ t 97 a 262 _b y 260 98 b 263 bi _ b 262 … 264 itt i 122 z 265 ty_ t 258 … 266 _bi _ 256 SEND 267 it_ b i 266 257 STOP 268 _bin n 110 STOP 257

  5. Input Send LZW Encoding SEND 256 i 105 t 116 Dictionary t 116 Index Word Index Word y 121 0 258 it _ 32 … 259 tt tt b 98 i 32 _ 260 ty t 258 … 261 y_ t 97 a 262 _b y 260 98 b 263 bi _ b 262 … 264 itt i 122 z 265 ty_ t 258 … 266 _bi _ 256 SEND 267 it_ b i 266 257 STOP 268 _bin n 110 STOP 257

  6. Input Send LZW Encoding SEND 256 i 105 t 116 Dictionary t 116 Index Word Index Word y 121 0 258 it _ 32 … 259 tt b 98 i 32 _ 260 ty ty t 258 … 261 y_ t 97 a 262 _b y 260 98 b 263 bi _ b 262 … 264 itt i 122 z 265 ty_ t 258 … 266 _bi _ 256 SEND 267 it_ b i 266 257 STOP 268 _bin n 110 STOP 257

  7. Input Send LZW Encoding SEND 256 i 105 t 116 Dictionary t 116 Index Word Index Word y 121 0 258 it _ 32 … 259 tt b 98 i 32 _ 260 ty t 258 … 261 y_ y_ t 97 a 262 _b y 260 98 b 263 bi _ b 262 … 264 itt i 122 z 265 ty_ t 258 … 266 _bi _ 256 SEND 267 it_ b i 266 257 STOP 268 _bin n 110 STOP 257

  8. Input Send LZW Encoding SEND 256 i 105 t 116 Dictionary t 116 Index Word Index Word y 121 0 258 it _ 32 … 259 tt b 98 i 32 _ 260 ty t 258 … 261 y_ t 97 a 262 _b _b y 260 98 b 263 bi _ b 262 … 264 itt i 122 z 265 ty_ t 258 … 266 _bi _ 256 SEND 267 it_ b i 266 257 STOP 268 _bin n 110 STOP 257

  9. Input Send LZW Encoding SEND 256 i 105 t 116 Dictionary t 116 Index Word Index Word y 121 0 258 it _ 32 … 259 tt b 98 i 32 _ 260 ty t 258 … 261 y_ t 97 a 262 _b y 260 98 b 263 bi bi _ b 262 … 264 itt i 122 z 265 ty_ t 258 … 266 _bi _ 256 SEND 267 it_ b i 266 257 STOP 268 _bin n 110 STOP 257

  10. Input Send LZW Encoding SEND 256 i 105 t 116 Dictionary t 116 Index Word Index Word y 121 0 258 it _ 32 … 259 tt b 98 i 32 _ 260 ty t 258 … 261 y_ t 97 a 262 _b y 260 98 b 263 bi _ b 262 … 264 itt itt i 122 z 265 ty_ t 258 … 266 _bi _ 256 SEND 267 it_ b i 266 257 STOP 268 _bin n 110 STOP 257

  11. Input Send LZW Encoding SEND 256 i 105 t 116 Dictionary t 116 Index Word Index Word y 121 0 258 it _ 32 … 259 tt b 98 i 32 _ 260 ty t 258 … 261 y_ t 97 a 262 _b y 260 98 b 263 bi _ b 262 … 264 itt i 122 z 265 ty_ ty_ t 258 … 266 _bi _ 256 SEND 267 it_ b i 266 257 STOP 268 _bin n 110 STOP 257

  12. Input Send LZW Encoding SEND 256 i 105 t 116 Dictionary t 116 Index Word Index Word y 121 0 258 it _ 32 … 259 tt b 98 i 32 _ 260 ty t 258 … 261 y_ t 97 a 262 _b y 260 98 b 263 bi _ b 262 … 264 itt i 122 z 265 ty_ t 258 … 266 _bi _bi _ 256 SEND 267 it_ b i 266 257 STOP 268 _bin n 110 STOP 257

  13. Input Send LZW Encoding SEND 256 i 105 t 116 Dictionary t 116 Index Word Index Word y 121 0 258 it _ 32 … 259 tt b 98 i 32 _ 260 ty t 258 … 261 y_ t 97 a 262 _b y 260 98 b 263 bi _ b 262 … 264 itt i 122 z 265 ty_ t 258 … 266 _bi _ 256 SEND 267 it_ it_ b i 266 257 STOP 268 _bin n 110 STOP 257

  14. Input Send LZW Encoding SEND 256 i 105 t 116 Dictionary t 116 Index Word Index Word y 121 0 258 it _ 32 … 259 tt b 98 i 32 _ 260 ty t 258 … 261 y_ t 97 a 262 _b y 260 98 b 263 bi _ b 262 … 264 itt i 122 z 265 ty_ t 258 … 266 _bi _ 256 SEND 267 it_ b i 266 257 STOP 268 _bin _bin n 110 STOP 257

  15. Input Send LZW Encoding SEND 256 i 105 t 116 Dictionary t 116 Index Word Index Word y 121 0 258 it _ 32 … 259 tt b 98 i 32 _ 260 ty t 258 … 261 y_ t 97 a 262 _b y 260 98 b 263 bi _ b 262 … 264 itt i 122 z 265 ty_ t 258 … 266 _bi _ 256 SEND 267 it_ b i 266 257 STOP 268 _bin n 110 STOP 257

  16. Input Send LZW Encoding SEND 256 i 105 t 116 Dictionary t 116 Index Word Index Word y 121 0 258 it _ 32 … 259 tt b 98 i 32 _ 260 ty t 258 … 261 y_ t 97 a 262 _b y 260 98 b 263 bi _ b 262 … 264 itt i 122 z 265 ty_ t 258 … 266 _bi _ 256 SEND 267 it_ b i 266 257 STOP 268 _bin n 110 STOP 257

  17. Input Send LZW Encoding SEND 256 i 105 t 116 t 116 y 121 Compression Achieved _ 32 b 98 Message Words Bits / word Total i Original 18 8 144 t 258 LZW message 14 9 126 t y 260 _ b 262 i t 258 _ b i 266 n 110 STOP 257

  18. LZW Decoding

  19. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  20. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  21. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  22. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  23. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  24. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  25. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  26. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  27. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  28. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  29. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  30. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  31. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  32. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  33. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  34. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  35. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  36. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  37. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

  38. Received Input LZW Decoding 256 SEND 105 i 116 t Dictionary 116 t Index Word Index Word 121 y 0 258 it 32 _ … 259 tt 98 b 258 i 32 _ 260 ty t … 261 y_ 260 t 97 a 262 _b y 98 b 263 bi 262 _ b … 264 itt 258 i 122 z 265 ty_ t … 266 _bi 266 _ 256 SEND 267 it_ b i 257 STOP 268 _bin 110 n 257 STOP

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