Tag Archives: Ascending Sort

Ascending Sort Code With Effective Result in MATLAB – M. Ganesh Sai

tic
clc
clear all
a=imread(‘lena_gray.tif’);
imshow(a)
nf=.4;
ws=3;
b=imnoise(a,’salt & pepper’,nf);
figure,imshow(b)

[m1 n1]=size(a); 
r=floor(ws/2); 
b1=zeros(m1+ws-1); 
b1=uint8(b1); 
[m n]=size(b1);
b1(r+1:m-r,r+1:n-r)=b;
for i=r+1:m-r
for j=r+1:n-r
t1=b1(i-r:i+r,j-r:j+r);
t2=sort(t1(:));
le=length(t2);
len=ceil(le/2);
if (0<t1(r+1,r+1)&&t1(r+1,r+1)<255)
else
if t1(r+1,r+1)==255
for i1=len:-1:1
if (0<t2(i1)&&t2(i1)<255)
b1(i,j)=t2(i1);
break;
end
if (i1==1)
b1(i,j)=t2(len);
end
end
elseif t1(r+1,r+1)==0
for i1=len:le
if (0<t2(i1)&&t2(i1)<255)
b1(i,j)=t2(i1);
break;
end
if (i1==le)
b1(i,j)=t2(len);
end
end 
end
end
end
end
b2=b1(r+1:m-r,r+1:n-r);
figure,imshow(b2)
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