Download - LZW Encoding
![Page 1: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/1.jpg)
Robert Sedgewick and Kevin Wayne • Copyright © 2005 • http://www.Princeton.EDU/~cos226
LZW Encoding
The input message was taken from:http://www-mtl.mit.edu/Courses/6.095/notes/LZW-examples.html
![Page 2: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/2.jpg)
2
LZW Encoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Send
1161161213298
258
260
i
Input
tty_b
tty_
262bi
258t
i
_
266bi
110n257STOP
256SEND
![Page 3: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/3.jpg)
3
LZW Encoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Send
1161161213298
258
260
i
Input
tty_b
tty_
262bi
258t
i
_
266bi
110n257STOP
256SEND
![Page 4: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/4.jpg)
4
LZW Encoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Send
1161161213298
258
260
i
Input
tty_b
tty_
262bi
258t
i
_
266bi
110n257STOP
256SEND
it
![Page 5: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/5.jpg)
5
LZW Encoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Send
1161161213298
258
260
i
Input
tty_b
tty_
262bi
258t
i
_
266bi
110n257STOP
256SEND
tt
![Page 6: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/6.jpg)
6
LZW Encoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Send
1161161213298
258
260
i
Input
tty_b
tty_
262bi
258t
i
_
266bi
110n257STOP
256SEND
ty
![Page 7: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/7.jpg)
7
LZW Encoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Send
1161161213298
258
260
i
Input
tty_b
tty_
262bi
258t
i
_
266bi
110n257STOP
256SEND
y_
![Page 8: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/8.jpg)
8
LZW Encoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Send
1161161213298
258
260
i
Input
tty_b
tty_
262bi
258t
i
_
266bi
110n257STOP
256SEND
_b
![Page 9: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/9.jpg)
9
LZW Encoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Send
1161161213298
258
260
i
Input
tty_b
tty_
262bi
258t
i
_
266bi
110n257STOP
256SEND
bi
![Page 10: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/10.jpg)
10
LZW Encoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Send
1161161213298
258
260
i
Input
tty_b
tty_
262bi
258t
i
_
266bi
110n257STOP
256SEND
itt
![Page 11: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/11.jpg)
11
LZW Encoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Send
1161161213298
258
260
i
Input
tty_b
tty_
262bi
258t
i
_
266bi
110n257STOP
256SEND
ty_
![Page 12: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/12.jpg)
12
LZW Encoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Send
1161161213298
258
260
i
Input
tty_b
tty_
262bi
258t
i
_
266bi
110n257STOP
256SEND
_bi
![Page 13: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/13.jpg)
13
LZW Encoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Send
1161161213298
258
260
i
Input
tty_b
tty_
262bi
258t
i
_
266bi
110n257STOP
256SEND
it_
![Page 14: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/14.jpg)
14
LZW Encoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Send
1161161213298
258
260
i
Input
tty_b
tty_
262bi
258t
i
_
266bi
110n257STOP
256SEND
_bin
![Page 15: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/15.jpg)
15
LZW Encoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Send
1161161213298
258
260
i
Input
tty_b
tty_
262bi
258t
i
_
266bi
110n257STOP
256SEND
![Page 16: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/16.jpg)
16
LZW Encoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Send
1161161213298
258
260
i
Input
tty_b
tty_
262bi
258t
i
_
266bi
110n257STOP
256SEND
![Page 17: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/17.jpg)
17
105
Send
1161161213298
258
260
i
Input
tty_b
tty_
262bi
258t
i
_
266bi
110n257STOP
256SENDLZW Encoding
WordsOriginalMessage
18
Compression AchievedBits / word
8Total144
LZW message 14 9 126
![Page 18: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/18.jpg)
Robert Sedgewick and Kevin Wayne • Copyright © 2005 • http://www.Princeton.EDU/~cos226
LZW Decoding
![Page 19: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/19.jpg)
19
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 20: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/20.jpg)
20
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 21: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/21.jpg)
21
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 22: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/22.jpg)
22
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 23: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/23.jpg)
23
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 24: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/24.jpg)
24
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 25: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/25.jpg)
25
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 26: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/26.jpg)
26
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 27: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/27.jpg)
27
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 28: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/28.jpg)
28
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 29: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/29.jpg)
29
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 30: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/30.jpg)
30
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 31: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/31.jpg)
31
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 32: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/32.jpg)
32
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 33: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/33.jpg)
33
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 34: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/34.jpg)
34
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 35: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/35.jpg)
35
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 36: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/36.jpg)
36
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 37: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/37.jpg)
37
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND
![Page 38: LZW Encoding](https://reader035.vdocuments.us/reader035/viewer/2022062816/56814c52550346895db965ee/html5/thumbnails/38.jpg)
38
LZW Decoding
Word
_
ab
z
0Index
…32…9798
122
SEND…
256STOP257
…
itWord
tttyy__bbi
ty__biit_
_bin
258Index
259260261262263
265266267268
itt264
Dictionary105
Received
1161161213298
260
262
i
Input
tty_b
tty_
258bit
258 i
266 _bi
110 n257 STOP
256 SEND