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Commit a5505dc

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Neighbourhood Processing
Low Pass Filtering, High Pass Filtering, Median Pass Filtering
1 parent 8187773 commit a5505dc

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6 files changed

+74
-0
lines changed

6 files changed

+74
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lines changed
3 MB
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%High pass Filtering
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clc;
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clear all;
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a=imread('pout.tif');
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b=imnoise(a,'gaussian');
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a=double(a);
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b=double(b);
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w=[-1/9 -1/9 -1/9;-1/9 -1/9 8/9;-1/9 -1/9 -1/9];
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[m n]=size(b);
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for i=2:1:m-1
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for j=2:1:n-1
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r(i,j)=b(i-1,j-1)*w(1)+b(i-1,j)*w(2)+ b(i-1,j+1)*w(3)+ b(i,j-1)*w(4)+ b(i,j)*w(5)+ b(i,j+1)*w(6)+ b(i+1,j-1)*w(7)+ b(i+1,j)*w(8)+ b(i+1,j+1)*w(9) ;
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end
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end
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subplot(3,3,1)
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imshow(uint8(a));
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title('Original Image')
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subplot(3,3,2)
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imshow(uint8(b));
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title('Image with Gaussian Noise')
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subplot(3,3,3)
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imshow(uint8(r));
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title('High Pass Filtered Image')
3 MB
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%Low pass Filtering
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clc;
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clear all;
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a=imread('pout.tif');
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b=imnoise(a,'gaussian');
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a=double(a);
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b=double(b);
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w=[1/9 1/9 1/9;1/9 1/9 1/9;1/9 1/9 1/9];
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[m n]=size(b);
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for i=2:1:m-1
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for j=2:1:n-1
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r(i,j)=b(i-1,j-1)*w(1)+b(i-1,j)*w(2)+ b(i-1,j+1)*w(3)+ b(i,j-1)*w(4)+ b(i,j)*w(5)+ b(i,j+1)*w(6)+ b(i+1,j-1)*w(7)+ b(i+1,j)*w(8)+ b(i+1,j+1)*w(9) ;
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end
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end
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subplot(3,3,1)
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imshow(uint8(a));
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title('Original Image')
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subplot(3,3,2)
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imshow(uint8(b));
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title('Image with Gaussian Noise')
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subplot(3,3,3)
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imshow(uint8(r));
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title('Low Pass Filtered Image')
3 MB
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%Median Filtering
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clc;
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clear all;
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a=imread('coins.png');
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c=imnoise(a,'salt & pepper',0.02);
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c=double(c);
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[m n]=size(a);
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for i=2:1:m-1
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for j=2:1:n-1
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r=[c(i-1,j-1) c(i-1,j) c(i-1,j+1) c(i,j-1) c(i,j) c(i,j+1) c(i+1,j-1) c(i+1,j) c(i+1,j+1)];
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b=sort(r);
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d(i,j)= median(b);
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end
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end
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subplot(2,2,1)
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imshow(uint8(a));
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title('Original Image')
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subplot(2,2,2)
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imshow(uint8(c));
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title('Image with Salt and Pepper Noise')
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subplot(2,2,3)
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imshow(uint8(d));
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title('Median Filtered Image')

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