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Outline
• Introduction
• Bitmask compression technique – Dictionary technique
– Bitmask technique
• Proposed method
– Encoding Scheme
– Application to PCG compression• Eperiment !esults
• conclusion
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introduction•
Cardio#ascular diseases are the leading cause o$ death inthe %orld&
• 'eart diagnosis uses #ariety o$ sensors(
electrocardiography )ECG*+ magnetic resonance imaging),!I*
Echocardiography+ phonocardiography )PCG*• A phonocardiograph is less epensi#e+ less cum-ersome
and don.t need skills or a le#el o$ eperience
• /he PCG signal )phonocardiogram* is a recording o$ thesounds and murmurs made -y the heart %ith the help o$
digital stethoscope&
0
/ypical PCGsignal
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telemedicine
• In telemedicine applications a phonocardiograph is o$ greatimportance to achie#e a -asic diagnosis %hen higher2costtechniques are not readily a#aila-le
Compression o$ the PCG signal is una#oida-le to reduce-and%idth in telediagnosis systems
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!elated %orks
• a spanish %ork team de#elops many techniques $orPCG compression and incorporate theme as a module ina plat$orm called ASEP/IC )Aided System $or E#ent2-asedPhonocardiographic /elediagnosis %ith Integrated Compression*
• A /ai%anese team de#eloped Porta-le !eal2/ime'omecare System %ith Digital Camera Plat$orm and acompression module $or #ideo and PCG signals
•
%e ha#e ela-orated an e3cient method tocompress PCG signals
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PCG signal compressionscheme
5
6175samples Bior&
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Dictionary compressiontechnique
Originaldata
Compresseddata
dictionary
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-itmasks compressiontechnique
O r i g i n a
l
d a t a
C o m p r e s
s e d
d a t a
dictionary
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Choice of Bitmask patterns
9 1 9 1 9 9 9 9 9 9 9 9 99 9 9
Sliding -it2mask
:ied -it2mask 9 1 9 1 9 9 9 9 9 9 9 99 9 9 9
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Proposed Method
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Example of bitmask coding
919199999999999999999999999911119919999999999
9991919191999199199999999999999999999199999999999199199999911919999
Input -it
stream11" -its
-locking9191999999999
9999999999999991
11199199999999999991919191999199199999999999999999999199999999999199199999911919999
coding
9 9 19 99 91919 9 19 11 1111
9 9 99 991911919191999199199
9 19 9 91 991911199 9 11 19 11919991
output -itstream80 -its
99199991919919111111999999191191919199919919991999199191 11999111911919991
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GAI;
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Application to PCG compression
1"
( )
( )
2
1
2
0
1
(k) (k)
100(k)
N
ori rec
k
N
ori
k
X X
PRD X µ
=
=
−
= ×−
∑
∑
of original data
of compressed data
Length
CR Length=
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10
( )
( )
2~
1
2
1
2
~
1
21
1
[k] [k]
100[k]
[k] [k]
100[k]
J
J
j
j
K
J J k
J K
J k
K
j j J k
j K j
jk
CA CA
WEDD wCA
CD CD
wCD
=
=
=
==
− ÷ = × ×
− ÷ + × ×
∑∑
∑∑
∑
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=IS>A? ASSESS,E;/
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CONCLU!ON
•Association o$ SPI'/ and -itmaskcompression techniques yields highper$ormance in PCG signals
compression• ;e% directions
– impro#ement o$ the -itmask techniqueper$ormances -y means o$ constructinga larger dictionary %ith adequateelements si@e&
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