Getting started with matlab image processing

8/9/2019 Getting started with matlab image processing

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Two dayWorkshop onMatlab


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Technology beyond the Dreams Copyright 2006 Pantech Solutions Pvt

IntroductionCleve molar in 1984, Mathworks incIntroduced as a simulation tool

Supports Graphical ProgrammingCan e inter!aced with other "igh#evel languages


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Applications $erospace %iometrics

Medical &inance Control S'stem Signal,Image,$udio and (ideo )eural networks,&u**' logic $nimation


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List of Companies $+ %- .Photoshop/ )$S$

G- #0 2 %-2 % SC" P-PSI , C C$C #$ .)euro Marketing/


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ile !"tensions3!ig

M$ #$% &igure 3m

M$ #$% !unction, script, or class3mat M$ #$% inar' !ile !or storing varia les3me

M$ #$% e ecuta le .plat!orm speci!ic, e3g3 53me mac5 !or theMac, 53me gl 5 !or#inu , etc3/ 3p

M$ #$% content6o scured 3m !ile .result o! pcode./ /
http://en.wikipedia.org/wiki/Macintoshhttp://en.wikipedia.org/wiki/Linuxhttp://en.wikipedia.org/wiki/Linuxhttp://en.wikipedia.org/wiki/Macintosh


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Difference between C and Matlab

Matla is Proprietar' compiler,C has open source3 In uilt &unctions in Matla .$pplication riented/3

7ser !riendl' s'nta 3 &ourth generation Programming #anguage tool3


7/140Technology beyond the Dreams Copyright 2006 Pantech Solutions Pvt

Desktop Tools Command indow

t'pe commands

orkspace view program varia les

clear to clear dou le click on a varia le to see it in the $rra' -ditor

Command "istor' view past commands

save a whole session using diary

#aunch Pad access tools, demos and documentation



Command window



Change the current working

directory



Arithmetic operators

1) plus - Plus +2) uplus - Unary plus +3) minus - Minus -4) uminus - Unary minus -5) mtimes - Matrix multiply *6) times - Array multiply .*7) mpo er - Matrix po er !") po er - Array po er .!#) ml$i%i$e - &a'(slas or le t matrix $i%i$e 1,) mr$i%i$e - las or ri t matrix $i%i$e /11) l$i%i$e - 0e t array $i%i$e .12) r$i%i$e - i t array $i%i$e ./



#elational operators1) e - ual 2) ne - ot e ual 3) lt - 0ess t an

4) t - 8reater t an 95) le - 0ess t an or e ual 6) e - 8reater t an or e ual 9



Logical operators

1/ Short6circuit logical $)+ 00/ Short6circuit logical 2 ::;/ and 6 -lement6wise logical $)+ 04/ or 6 -lement6wise logical 2 :/ or 6 #ogical -?C#7SI(- 2@/ an' 6 rue i! an' element o! vector is non*ero8/ all 6 rue i! all elements o! vector are non*ero



$ITWI%! &'!#AT%1) :itan$ - &it- ise A ;.2) :it'mp - = .6) :itset - et :it.7) :it et - 8et :it.") :its i t - &it- ise s i t.



(ectorsa A B1 ; 4 < > 9 8 @ D

t A EF F Et = 0 2 4 6 8 10 12 14 16 18 20

A a

b = 3 4 5 6 7 8 11 10 9

c A a c = 4 6 8 10 12 14 20 18 16



Matrices& ?1 2 3 4@5 6 7 "@# 1, 11 12 @

& 1 2 3 4

5 6 7 "

# 1, 11 12

< &B

< 1 5 #2 6 1,

3 7 11

4 " 12



$asic matri" operators> in%C ) @DE F =G HI MAH E>?AJI ei C ) Dei en %alue K%e'tor p polyC ) Dpolynomial' a:sCy) @

; minCa)@; maxCa)@



'L&T

tAEFE3



I L&&'a 6@

i a 9 6

$ispCBa is reaterB)@ elsei a ,

$ispCBa is LeroB)@ else

$ispCBa is smallerB)@ en$



L&&'a 5@

or i 1 5

a a+1 en$

$ispCa)@

$)S a A1E



While Loop

a 5@

ile a 1,

a a+1@

en$

$ispCa)@$ns a A1E


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unction

!unction cAadd.a, /DcAa Dreturn

MainaADcAadd.a, /D

disp.c/DdAmul.a, /Ddisp.d/D

function c=mul(a,b);c=a*b;return


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%WITC) CA%! met o$ B&ilinearB@ s it' lo erCM HI=;) 'ase NBlinearBJB:ilinearBO $ispCBMet o$ is linearB) 'ase B'u:i'B $ispCBMet o$ is 'u:i'B) 'ase BnearestB $ispCBMet o$ is nearestB) ot er ise

$ispCBUn(no n met o$.B) en$

$ns Method is linear


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%WITC) *+,M!#ICAL-a inputCBenter----9B)@s it' a 'ase 1 print CBoneB)@

'ase 2 print CBt oB)@ 'ase 3 print CBt reeB)@ 'ase 4 print CB ourB)@ ot er ise print CBot er iseB)@en$


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)ow to read an imagea =imread('cameraman.tif');imshow(a);

pixval on;

a =imread('flowers.tif');imshow(a);

pixval on;


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)ow to read an audio file

a a%rea$CBtest. a%B)@a%playCaJ441,,)@PlotCa)@


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)ow to read an .ideo file

a=aviread('movie.avi');movie(a);


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Add two images

I A imread.Hrice3ti!H/D A imread.Hcameraman3ti!H/DJ A imadd.I, ,Huint1>H/Dimshow.J,B /

I = imread('rice.tif'); J = imadd(I, !); subplot(",#,"), imshow(I) subplot(",#,#), imshow(J)


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%ubtract two images

I A imread.Hrice3ti!H/D IK A imsu tract.I,


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Con.ert image to gray and binaryclc;

clear;close alla= imread('flowers.tif');subplot(#,#,");

imshow(a);subplot(#,#,#); b=imresi$e(a,%# & # & );imshow(b);subplot(#,#, );c=r b# ra (b);imshow(c);subplot(#,#,+);d=im#bw(c);

imshow(d);


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#/$ componenta=imread('flowers.tif');subplot(#,#,");imshow(a);=a;-=a;=a;

(/,/,#/ )=!;subplot(#,#,#);imshow( );-(/,/,")=!;-(/,/, )=!;subplot(#,#, );imshow(-);(/,/,")=!;(/,/,#)=!;subplot(#,#,+);imshow( );


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Con.ert Image into &ne dimensional

a A imread.Hcameraman3ti!H/D

Br c Asi*e.a/D

#enArLcD

Areshape.a,B1 #en /D


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C&+(!# M&(I! T& #AM!%

!ileAaviin!o.Hmovie13aviH/D to get in!oramtaion a t video !ile!rmNcntA!ile3)um&rames )o3o! !rames in the video !ilestr AH3 mpH h A wait ar.E,HPlease wait333H/D!or iA1F!rmNcnt !rm.i/Aaviread.!ilename,i/D read the (ideo !ile !rmNnameA!rame im.!rm.i//D Convert &rame to image !ile

!rmNnameArg gra'.!rmNname/D convert gra'!ilename1Astrcat.strcat.num str.i//,str /D

imwrite.!rmNname,!ilename1/D rite image !ile wait ar.iO!rmNcnt,h/

endclose.h/


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C&+(!#T #AM!% T& M&(I!%!rmNcntA


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)ow to read a te"t file!id A !open.Hmessage3t tH,HrH/Dice1A !read.!id/Ds A char.ice1H/D!close.!id/Ddisp.s/D

$ns hello


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)ow to write a te"t file

txt=%& &0 &1 &2 ;fid = fopen('output.txt','wb');

fwrite(fid,char(txt),'char');fclose(fid);

345 =3678


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%A(! A+D L&AD T)! (A#IA$L!

$A


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Wa.elet transform

a =imread('cameraman.tif');

%99 9: :9 :: =dwt#(a,'haar');

7ec=%... 99,9: :9,:: ... ;

imshow(7ec,% );


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DCT transform

a=imread('cameraman.tif');subplot(", ,");imshow(a,% );

b=dct#(a);subplot(", ,#);imshow(b,% );title('76 ');c=idct#(b);subplot(", , );imshow(c,% );title('I76 ');


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+&I%! A+D ILT!#

I = imread('ei ht.tif'); J = imnoise(I,'salt < pepper',!.!#); = medfilt#(J); subplot(",#,");imshow(J)subplot(",#,#);imshow( )


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/,I


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DIAL&/ $&1

warndl ('hello'); helpdl ('hello'); errordl ('hello');

ms box('hello');


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%utton)ameAKuestdlg.H hat is 'our wishQH, 333 HGenie RuestionH, 333 H&oodH,HClothingH,HMone'H,HMone'H/D

switch %utton)ame, case H&oodH,

disp.H&ood is deliveredH/D case HClothingH, disp.H he -mperorHHs new clothes have arrived3H/ case HMone'H, disp.H$ ton o! mone' !alls out the sk'3H/D end switch


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,%!# I+T!# AC! /!T IL!B!ilename, pathname A uiget!ile.HL3mH, HPick an M6!ileH/D i! iseKual.!ilename,E/ : iseKual.pathname,E/ disp.H7ser pressed cancelH/ else disp.BH7ser selected H, !ull!ile.pathname, !ilename/ / end


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,%!# I+T!# AC! ',T IL!

%filename, pathname = uiputfile('*.m', '>ic? an @Afile'); if iseBual(filename,!) C iseBual(pathname,!) disp('Dser pressed cancel') else disp(%'Dser selected ', fullfile(pathname, filename) ) end


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/,I


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/,I2


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M!+, $A#


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',%) $,TT&+


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T&//L! $,TT&+


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#ADI& $,TT&+


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C)!C3$&1


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!DIT T!1T


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%LID!#


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#AM!


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LI%T$&1


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'&',' M!+,


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A1!%


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ALI/+ &$4!CT%


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M!+, !DIT


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'#&'!#T5 I+%'!CT


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#,+


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!M'T5 /,I


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/!+!#AT!D M IL!


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',%) $,TT&+


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#I/)T CLIC3 ',%) $,TT&+ 6 /&

'#&'!#T5 I+%'!CT


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C)A+/! T)! %T#I+/ A+D TA/

(AL,!


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C)A+/! T)! %T#I+/ A+D TA/

(AL,!


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#I/)T CLIC3 ',%) $,TT&+ 6 /&

M IL! !DIT


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/& CALL$AC3


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W#IT! T)! C&D! $!L&W T)!

CALL$AC3a =imread('cameraman.tif');

imshow(a);


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#,+ T)! '#&/#AM '#!%% 7


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C)&&%! A1!%


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#I/)T CLIC3 A1!% 6 /&

'#&'!#T5 I+%'!CT


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C)A+/! T)! %T#I+/ A+D TA/

(AL,!


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W#IT! T)! C&D! $!L&W T)!

CALL$AC3a =imread('cameraman.tif');axes(handles.one);

imshow(a);


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#,+ T)! '#&/#AM


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C&D!


axes(handles.one);

imshow(a);


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T&//L! $,TT&+


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#I/)T CLIC3 T&//L! 6 /&

'#&'!#T5 I+%'!CT


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C)A+/! T)! %T#I+/ A+D TA/

(AL,!


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#I/)T CLIC3 T&//L! 6 /& M

IL! !DIT


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W#IT! T)! C&D! $!L&W T)!

CALL$AC3a=get(hObject,'Value');

if a ==1


axes(handles.one);

imshow(a); else a =imread('greens.j g');

axes(handles.one);

imshow(a); end


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#,+ T)! '#&/#AM


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#I/)T CLIC3 #ADI& $,TT&+ 6 /&

'#&'!#T5 I+%'!CT


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C)A+/! T)! %T#I+/ A+D TA/

(AL,!


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#I/)T CLIC3 C)!C3 $&1 6 /&

M IL! !DIT


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W#IT! T)! C&D! $!L&W T)!

CALL$AC3


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#I/)T CLIC3 C)!C3 $&1 6 /&

'#&'!#T5 I+%'!CT


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C)A+/! T)! %T#I+/ A+D TA/

(AL,!


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#I/)T CLIC3 C)!C3 $&1 6 /&

M IL! !DIT


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W#IT! T)! C&D! $!L&W T)!

CALL$AC3


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#I/)T CLIC3 #AM! 6 %!+D T&

$AC3


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#,+ T)! '#&/#AM


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#I/)T CLIC3 LI%T $&1 6 /&

'#&'!#T5 I+%'!CT


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!DIT T)! %T#I+/ &'TI&+%


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#I/)T CLIC3 LI%T $&1 6 /& M

IL! !DIT


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W#IT! T)! C&D! $!L&W T)!

CALL$AC3contents = et(hEbFect,'Galue')switch contents

case " a =imread('cameraman.tif'); axes(handles.one); imshow(a); case # a =imread('flowers.tif'); axes(handles.one); imshow(a); case a =imread('rice.tif'); axes(handles.one); imshow(a); otherwise a =imread('mri.tif'); axes(handles.one); imshow(a); end


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C)&&%! '&','M!+,


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#I/)T CLIC3 '&',' M!+, 6 /&

'#&'!#T5 I+%'!CT


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!DIT T)! %T#I+/ &'TI&+%


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W#IT! T)! C&D!contents = et(hEbFect,'Galue')

switch contents

case " a =imread('cameraman.tif'); axes(handles.one); imshow(a); case # a =imread('flowers.tif'); axes(handles.one); imshow(a); case a =imread('rice.tif'); axes(handles.one); imshow(a); otherwise a =imread('mri.tif'); axes(handles.one); imshow(a); end


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#I/)T CLIC3 !DIT T!1T 6 /&

'#&'!#T5 I+%'!CT


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!DIT %T#I+/ A+D TA/


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#I/)T CLIC3 !DIT T!1T 6 /&

M IL! !DIT


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#I/)T CLIC3 A1!% 6 /&

'#&'!#T5 I+%'!CT


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W#IT! T)! C&D! $!L&W T)!

CALL$AC3


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W#IT! T)! C&D! $!L&W T)!

CALL$AC3

a= et(hEbFect,'5trin ') ; b=char(a);c=imread(b);axes(handles.one);imshow(c);


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#I/)T CLIC3 %TATIC T!1T 6 /&

'#&'!#T5 I+%'!CT

) )


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C)A+/! T)! %T#I+/ A+D TA/

(AL,!

) $ )


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W#IT! T)! C&D! $!L&W T)!

CALL$AC3a= et(hEbFect,'5trin ') ;set(handles.t",'5trin ',a);

b=char(a);c=imread(b);axes(handles.one);imshow(c);


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%LID!#


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D#&' TW& A1!%


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D#&' ',%) $,TT&+

C)A+/! T)! %T#I+/ A+D TA/


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C)A+/! T)! %T#I+/ A+D TA/

(AL,!


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/& CALL$AC3

W#IT! T)! C&D! $!L&W T)!


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W#IT! T)! C&D! $!L&W T)!

CALL$AC3%filename, pathname = ui etfile('*.bmp', '>ic? a n Ima e');

if iseBual(filename,!) C iseBual(pathname,!)

warndl ('Dser pressed cancel') else

a=imread(filename); axes(handles.axes"); imshow(a); handles.filename=filename; uidata(hEbFect, handles);

end

#I/)T CLIC3 %LID!# 6 /& M


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#I/)T CLIC3 %LID!# 6 /& MIL! !DIT


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W#IT! T)! C&D! $!L&W T)!


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W#IT! T)! C&D! $!L&W T)!CALL$AC3


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M!+, !DIT


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!DIT %T#I+/ A+D TA/


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#,+


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Thresholding $ased %egmentation9C


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Con : clc;

clear; close all; InputImage=imread('"$.bmp'); figure; imshow(InputImage); !olour*pace!on+ersion=rgb2hs+(InputImage); imshow(!olour*pace!on+ersion); -ra *caleImage=rgb2gra (!olour*pace!on+ersion); -ra *caleImage=!olour*pace!on+ersion( , ,1); %rows columns planes =si e(-ra *caleImage); Binar /as0= -ra *caleImage .3;

figure; imshow(Binar /as0); Impi4elinfo h = waitbar( ,'5lease wait...'); *egmentedImage=% ;

Cont ;


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for i=1 rows for 6=1 columns

if Binar /as0(i,6) == 1 *egmentedImage(i,6,1)=InputImage(i,6,1); *egmentedImage(i,6,2)=InputImage(i,6,2); *egmentedImage(i,6,")=InputImage(i,6,"); else *egmentedImage(i,6,1)= ;

*egmentedImage(i,6,2)= ; *egmentedImage(i,6,")= ; end end waitbar(i7rows,h)end *egmentedImage=uint8(*egmentedImage);figure;imshow(*egmentedImage);impi4elinfo;

Image usion


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gclc;clear;close all;/1=imread('mri.6pg');/2=imread('ct.6pg');subplot(2,2,1);imshow(/1);title('/9I');subplot(2,2,2);imshow(/2);title('!:');

%9 ! 5 =si e(/1);for i=1 9 for 6=1 ! if /1(i,6) /2(i,6) usedImage(i,6)=/1(i,6);

else

usedImage(i,6)=/2(i,6);end

endend


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Image fusion9Cont ;subplot(2,2,");imshow( usedImage);title('/a4');for i=1 9 for 6=1 !

if /1(i,6) /2(i,6) usedImage(i,6)=/2(i,6);

else usedImage(i,6)=/1(i,6);

end endendsubplot(2,2,$);imshow( usedImage);title('/in');


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Getting started with matlab image processing