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 Experiment # 6 

Objective: Introduction to histogram, histogram calculation and equalization

in MATLAB.

Resource Required: MATLAB R2009a softare.

Exercise:

%EXPERIMENT 6

%histogram equai!atio" 

function !count" #m$hist%&'

 imread%(image.)*g('+#rg&2gra$%&'+

min#%min%min%'''+

ma#ma%ma%''+

 

count#%zeros%-,2/''+

for  i# minma

  count%i1-'#sum%sum%##i''+

end

 

figure%-'+

su&*lot%-,2,-'+

 &ar%02,count'

title%(histogram &$ function('

su&*lot%-,2,2'+

imhist%'

title%(histogram &$ command('

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O#TP#T:

histogram equalization 

!count"#m$hist%'

 

!ro col" # size%'+

 

 3#length%%''+

 

min#min%min%''+

ma#ma%ma%''+

 

cdf 

 

c#cumsum%count'+

M#min%c'+

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equalization

 $#zeros%size%''+

 

for  )#-2/

  find%-##)'

  for  i#-ro

  for  m# -col

  if  %i,m'##)

  $%i,m'#ceil%%%c%)'4M'5%34M''62'+

 

end

  end

  end

 

end

 

figure%-'+

su&*lot%-,2,-'+

 

imsho%uint7%$''

title %(equalized image('+

su&*lot%-,2,2'+

imsho%'

title%(original image('+

 figure %2'+

 su&*lot%-,2,-'+

imhist%uint7%$''+

title%(equalized histogram('+

su&*lot%-,2,2'+

imhist%'

title%(original histogram('+

O#TP#T:

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$ear"i"g Outcome:   In this la& e ha8e learnt etended conce*t of image

 *rocessing as Introduction to histogram, histogram calculation and equalization. ere e

ha8e done istogram equalization ithout using MATLAB in4&uilt command and further eha8e 8erified that &$ using in4&uilt MATLAB command.