Tag Archives: Column sort

Column Sorting Code with Best Result in Matlab(2-D)

clc, clear, close all;
tic

a=imread(‘cameraman.tif’); imshow(a);
nf=.5;
ws=3;
ll=floor(ws/2);

b=imnoise(a,’salt & pepper’,nf); % Generation of noisey input to algorithm
figure,imshow(b);

[m1 n1]=size(a);
b1=zeros(m1+ws-1);
b1=uint8(b1);
[m n]=size(b1);
b1(ll+1:m-ll,ll+1:n-ll)=b;
for i = 2:m-1
for j = 2:n-1
if(b1(i,j)<=0||b1(i,j)>=255)
y=b1(i-ll:i+ll,j-ll:j+ll);
p = sort(y(:,1:1));
q = sort(y(:,2:2));
r = sort(y(:,3:3));
b = [p,q,r];
S = sort(b(:));
flg = 1;
if S(1) < b1(i,j) && b1(i,j) < S(5) && 0 < S(1) && S(9) < 255
b1(i,j) = y(i,j);

else
b1(i,j) = S(5);
end
end
end
end

b2=b1(ll+1:m-ll,ll+1:n-ll);
figure,imshow(b2)
[psnr,mse]=psnr_mse_maxerr(a,b2);
display(psnr)
display(mse)
toc

cameraman_NF_2_4_8_U-sort

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