Upload
bryan-armstrong
View
217
Download
5
Embed Size (px)
Citation preview
CS430
© 2006 Ray S. Babcock
LZW CodingLZW Coding
Lempel-Ziv-WelchLempel-Ziv-Welch
CS430
© 2006 Ray S. Babcock
4 x 4 x 8bit
39 39 126 126
39 39 126 126
39 39 126 126
39 39 126 126
Dictionary
0 : 01 : 1
255 : 255
… : …
Currently Recognized Sequence
Encoded Output
39
Found in Dictionary!39
CS430
© 2006 Ray S. Babcock
4 x 4 x 8bit
39 39 126 126
39 39 126 126
39 39 126 126
39 39 126 126
Dictionary
0 : 01 : 1
255 : 255
… : …
Currently Recognized Sequence
Encoded Output
39
Found in Dictionary!39
256 : 39 39
39
CS430
© 2006 Ray S. Babcock
4 x 4 x 8bit
39 39 126 126
39 39 126 126
39 39 126 126
39 39 126 126
Dictionary
0 : 01 : 1
255 : 255
… : …
Currently Recognized Sequence
Encoded Output
39 126
Found in Dictionary!126
256 : 39 39
39
257 : 39 126
CS430
© 2006 Ray S. Babcock
4 x 4 x 8bit
39 39 126 126
39 39 126 126
39 39 126 126
39 39 126 126
Dictionary
0 : 01 : 1
255 : 255
… : …
Currently Recognized Sequence
Encoded Output
126 126
Found in Dictionary!126
256 : 39 39
39 39
257 : 39 126258 : 126 126
CS430
© 2006 Ray S. Babcock
4 x 4 x 8bit
39 39 126 126
39 39 126 126
39 39 126 126
39 39 126 126
Dictionary
0 : 01 : 1
255 : 255
… : …
Currently Recognized Sequence
Encoded Output
39
Found in Dictionary!39
256 : 39 39
39 39
257 : 39 126258 : 126 126
126
259 : 126 39126
CS430
© 2006 Ray S. Babcock
4 x 4 x 8bit
39 39 126 126
39 39 126 126
39 39 126 126
39 39 126 126
Dictionary
0 : 01 : 1
255 : 255
… : …
Currently Recognized Sequence
Encoded Output
39
256 : 39 39
39 39
257 : 39 126258 : 126 126
126
259 : 126 39
126Found in Dictionary!39
39
256
CS430
© 2006 Ray S. Babcock
4 x 4 x 8bit
39 39 126 126
39 39 126 126
39 39 126 126
39 39 126 126
Dictionary
0 : 01 : 1
255 : 255
… : …
Currently Recognized Sequence
Encoded Output
39
Found in Dictionary!39
256 : 39 39
39 39
257 : 39 126258 : 126 126
126
259 : 126 39
126
CS430
© 2006 Ray S. Babcock
4 x 4 x 8bit
39 39 126 126
39 39 126 126
39 39 126 126
39 39 126 126
Dictionary
0 : 01 : 1
255 : 255
… : …
Currently Recognized Sequence
Encoded Output
39
Found in Dictionary!39
256 : 39 39
39 39
257 : 39 126258 : 126 126
126
259 : 126 39
126
CS430
© 2006 Ray S. Babcock
4 x 4 x 8bit
39 39 126 126
39 39 126 126
39 39 126 126
39 39 126 126
Dictionary
0 : 01 : 1
255 : 255
… : …
Currently Recognized Sequence
Encoded Output
39
Found in Dictionary!39
256 : 39 39
39 39
257 : 39 126258 : 126 126
126
259 : 126 39
126
39
256
CS430
© 2006 Ray S. Babcock
4 x 4 x 8bit
39 39 126 126
39 39 126 126
39 39 126 126
39 39 126 126
Dictionary
0 : 01 : 1
255 : 255
… : …
Currently Recognized Sequence
Encoded Output
Found in Dictionary!126
256 : 39 39
39 39
257 : 39 126258 : 126 126
126
259 : 126 39
126 256
260 : 39 39 126126
CS430
© 2006 Ray S. Babcock
4 x 4 x 8bit
39 39 126 126
39 39 126 126
39 39 126 126
39 39 126 126
Dictionary
0 : 01 : 1
255 : 255
… : …
Currently Recognized Sequence
Encoded Output
Found in Dictionary!126
256 : 39 39
39 39
257 : 39 126258 : 126 126
126
259 : 126 39
126 256
260 : 39 39 126126 126
258
CS430
© 2006 Ray S. Babcock
ETCETC