IIII
Classified in Computers
Written at on 
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Spatial
clear all;
clc;
a=imread('coin.Jpg');
[row col dim]=size(a);
i=1;j=1;
for x=1:10:row;
for y=1:10:col
c(i,j)=a(x,y);
j=j+1;
end
j=1;
i=i+1;
end
figure(1);
subplot(2,2,1);
imshow(a);
figure(2);
subplot(2,2,2);
imshow(c);
figure(3);
imagesc(c);
colormap('gray');
Digital Negative
clc;
a=imread('Cameraman.Jpg');
f=double(a);
[row col dim]=size(f);
b=255;
g=b-a;
subplot(2,2,1);
imshow(a);
title('Original Image');
subplot(2,2,3);
colormap(gray);
imshow(g);
title('Negative Image');
Threshold
clc;
a=imread('coin.Jpg');
c=rgb2gray(a);
f=double(c);
[row col dim]=size(f);
t=input('Enter the threshold value=');
for x=1:1:row
for y=1:1:col
if f(x,y)=0;
else
g(x,y)=255;
end
end
end
subplot(2,2,1);
imshow(a);
title('Original Image');
subplot(2,2,2);
imshow(c);
title('rgb2gray');
subplot(2,2,3);
imshow(g);
title('Threshold Image');
Prewitts mask
clc;
figure(1);
a=imread('ttt.Tiff');
PH=[-1 0 1;-1 0 1;-1 0 1];
PV=[-1 -1 -1;0 0 0;1 1 1];
P=PH+PV;
RH=conv2(a,PH);
imshow(RH);
figure(2);
RV=conv2(a,PV);
imshow(RV);
figure(3);
R=RH+RV;
imshow(R);
figure(4);
RP=conv2(a,P);
imshow(RP);
figure(5);
imshow(a);
figure(6);
p=imnoise(a,'gaussian');
imshow(p);
Bit Plane Slicing
clc;
clear all;
a=imread('Camera.Tiff');
f=double(a);
[row col dim]=size(f);
r=input('enter number of bit=');
for x=1:1:row
for y=1:1:col
c=dec2bin(f(x,y),8);
d=c(r);
w(x,y)=double(d);
if w(x,y)==49
w(x,y)=255;
else
w(x,y)=0;
end
end
end
imshow(uint8(w));
imagesc(w);