Demo lzw
38
Princeton University • COS 226 • Algorithms and Data Structures • Spring 2004 • Kevin Wayne • 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
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Transcript of Demo lzw
Princeton University • COS 226 • Algorithms and Data Structures • Spring 2004 • Kevin Wayne • 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
2
LZW Encoding
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LZW Encoding
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LZW Encoding
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LZW Encoding
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LZW Encoding
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LZW Encoding
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Input
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_bin
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LZW Encoding
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Index
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Input
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LZW Encoding
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itt264
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LZW Encoding
Words
Original
Message
18
Compression Achieved
Bits / word
8
Total
144
LZW message 14 9 126
Princeton University • COS 226 • Algorithms and Data Structures • Spring 2004 • Kevin Wayne • http://www.Princeton.EDU/~cos226
LZW Decoding
The input message was taken from:
• http://www-mtl.mit.edu/Courses/6.095/notes/LZW-examples.html
19
LZW Decoding
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Index
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itt264
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Received
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Input
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LZW Decoding
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Index
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Index
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itt264
Dictionary
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Received
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i
Input
t
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b
t
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LZW Decoding
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Index
259
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itt264
Dictionary
105
Received
116
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32
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i
Input
t
t
y
_
b
t
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110 n
257 STOP
256 SEND
22
LZW Decoding
Word
_
a
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0
Index
…
32
…
97
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122
SEND
…
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STOP257
…
it
Word
tt
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_b
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ty_
_bi
it_
_bin
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Index
259
260
261
262
263
265
266
267
268
itt264
Dictionary
105
Received
116
116
121
32
98
260
262
i
Input
t
t
y
_
b
t
t
y
_
258
b
i
t
258 i
266 _
b
i
110 n
257 STOP
256 SEND
23
LZW Decoding
Word
_
a
b
z
0
Index
…
32
…
97
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122
SEND
…
256
STOP257
…
it
Word
tt
ty
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_b
bi
ty_
_bi
it_
_bin
258
Index
259
260
261
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263
265
266
267
268
itt264
Dictionary
105
Received
116
116
121
32
98
260
262
i
Input
t
t
y
_
b
t
t
y
_
258
b
i
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258 i
266 _
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110 n
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24
LZW Decoding
Word
_
a
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0
Index
…
32
…
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SEND
…
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STOP257
…
it
Word
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it_
_bin
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Index
259
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itt264
Dictionary
105
Received
116
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32
98
260
262
i
Input
t
t
y
_
b
t
t
y
_
258
b
i
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258 i
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110 n
257 STOP
256 SEND
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LZW Decoding
Word
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Index
…
32
…
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SEND
…
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STOP257
…
it
Word
tt
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it_
_bin
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Index
259
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itt264
Dictionary
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Received
116
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121
32
98
260
262
i
Input
t
t
y
_
b
t
t
y
_
258
b
i
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258 i
266 _
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110 n
257 STOP
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26
LZW Decoding
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_
a
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Index
…
32
…
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SEND
…
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it
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tt
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it_
_bin
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Index
259
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itt264
Dictionary
105
Received
116
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121
32
98
260
262
i
Input
t
t
y
_
b
t
t
y
_
258
b
i
t
258 i
266 _
b
i
110 n
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256 SEND
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LZW Decoding
Word
_
a
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z
0
Index
…
32
…
97
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SEND
…
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STOP257
…
it
Word
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bi
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it_
_bin
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Index
259
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itt264
Dictionary
105
Received
116
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32
98
260
262
i
Input
t
t
y
_
b
t
t
y
_
258
b
i
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258 i
266 _
b
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110 n
257 STOP
256 SEND
28
LZW Decoding
Word
_
a
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0
Index
…
32
…
97
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SEND
…
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STOP257
…
it
Word
tt
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it_
_bin
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Index
259
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itt264
Dictionary
105
Received
116
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32
98
260
262
i
Input
t
t
y
_
b
t
t
y
_
258
b
i
t
258 i
266 _
b
i
110 n
257 STOP
256 SEND
29
LZW Decoding
Word
_
a
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z
0
Index
…
32
…
97
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122
SEND
…
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STOP257
…
it
Word
tt
ty
y_
_b
bi
ty_
_bi
it_
_bin
258
Index
259
260
261
262
263
265
266
267
268
itt264
Dictionary
105
Received
116
116
121
32
98
260
262
i
Input
t
t
y
_
b
t
t
y
_
258
b
i
t
258 i
266 _
b
i
110 n
257 STOP
256 SEND
30
LZW Decoding
Word
_
a
b
z
0
Index
…
32
…
97
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122
SEND
…
256
STOP257
…
it
Word
tt
ty
y_
_b
bi
ty_
_bi
it_
_bin
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Index
259
260
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265
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268
itt264
Dictionary
105
Received
116
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98
260
262
i
Input
t
t
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b
t
t
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b
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i
110 n
257 STOP
256 SEND
31
LZW Decoding
Word
_
a
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Index
…
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…
97
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SEND
…
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STOP257
…
it
Word
tt
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_bi
it_
_bin
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Index
259
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itt264
Dictionary
105
Received
116
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121
32
98
260
262
i
Input
t
t
y
_
b
t
t
y
_
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b
i
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266 _
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i
110 n
257 STOP
256 SEND
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LZW Decoding
Word
_
a
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Index
…
32
…
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SEND
…
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STOP257
…
it
Word
tt
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bi
ty_
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it_
_bin
258
Index
259
260
261
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263
265
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itt264
Dictionary
105
Received
116
116
121
32
98
260
262
i
Input
t
t
y
_
b
t
t
y
_
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b
i
t
258 i
266 _
b
i
110 n
257 STOP
256 SEND
33
LZW Decoding
Word
_
a
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Index
…
32
…
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SEND
…
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…
it
Word
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it_
_bin
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Index
259
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itt264
Dictionary
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Received
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i
Input
t
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b
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LZW Decoding
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Index
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…
it
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it_
_bin
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Index
259
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itt264
Dictionary
105
Received
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262
i
Input
t
t
y
_
b
t
t
y
_
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b
i
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266 _
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LZW Decoding
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Index
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…
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…
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it
Word
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_bin
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Index
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261
262
263
265
266
267
268
itt264
Dictionary
105
Received
116
116
121
32
98
260
262
i
Input
t
t
y
_
b
t
t
y
_
258
b
i
t
258 i
266 _
b
i
110 n
257 STOP
256 SEND
36
LZW Decoding
Word
_
a
b
z
0
Index
…
32
…
97
98
122
SEND
…
256
STOP257
…
it
Word
tt
ty
y_
_b
bi
ty_
_bi
it_
_bin
258
Index
259
260
261
262
263
265
266
267
268
itt264
Dictionary
105
Received
116
116
121
32
98
260
262
i
Input
t
t
y
_
b
t
t
y
_
258
b
i
t
258 i
266 _
b
i
110 n
257 STOP
256 SEND
37
LZW Decoding
Word
_
a
b
z
0
Index
…
32
…
97
98
122
SEND
…
256
STOP257
…
it
Word
tt
ty
y_
_b
bi
ty_
_bi
it_
_bin
258
Index
259
260
261
262
263
265
266
267
268
itt264
Dictionary
105
Received
116
116
121
32
98
260
262
i
Input
t
t
y
_
b
t
t
y
_
258
b
i
t
258 i
266 _
b
i
110 n
257 STOP
256 SEND
38
LZW Decoding
Word
_
a
b
z
0
Index
…
32
…
97
98
122
SEND
…
256
STOP257
…
it
Word
tt
ty
y_
_b
bi
ty_
_bi
it_
_bin
258
Index
259
260
261
262
263
265
266
267
268
itt264
Dictionary
105
Received
116
116
121
32
98
260
262
i
Input
t
t
y
_
b
t
t
y
_
258
b
i
t
258 i
266 _
b
i
110 n
257 STOP
256 SEND
