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Contrast Stretching

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Point Processing Technique/Contrast Stretching
- contrast.bmp
- contraststretching.m

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	`1`	`+%Contrast stretching`
	`2`	`+%lt=5 and ut=10`
	`3`	`+close all;`
	`4`	`+close all;`
	`5`	`+clc;`
	`6`	`+a=imread('pout.tif');`
	`7`	`+subplot(2,1,1);`
	`8`	`+imshow(a);`
	`9`	`+[m,n]=size(a);`
	`10`	`+b=a;`
	`11`	`+t1=input('enter threshold value1');`
	`12`	`+t2=input('enter threshold value2');`
	`13`	`+for i=1:1:m`
	`14`	`+ for j=1:1:n`
	`15`	`+ if(a(i,j)<t1)`
	`16`	`+ b(i,j)=0.5*t1;`
	`17`	`+ else if(a(i,j)<t2 & a(i,j)>t1)`
	`18`	`+ b(i,j)=2(a(i,j)-t1) + 0.5t1;`
	`19`	`+ else`
	`20`	`+ b(i,j)=0.5(a(i,j)-t2) + 2(t2-t1) + 0.5*t1;`
	`21`	`+ end`
	`22`	`+ end`
	`23`	`+ end`
	`24`	`+end`
	`25`	`+subplot(2,1,2)`
	`26`	`+imshow(b);`

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