Mask = [-1 -1 -1; -1 8 -1; -1 -1 -1]; 

lena = imread('lena.pgm');

lena2=conv2(lena,Mask);

figure(1);
imshow(lena);

figure(2);
imshow(uint8(lena2));


F = fftshift(fft2(lena)); 
M = log(abs(F)+1); 
M = (M./max(max(M)))*255; 
figure(3);
imshow(uint8(M));


F = fftshift(fft2(lena2)); 
M = log(abs(F)+1); 
M = (M./max(max(M)))*255; 
figure(4);
imshow(uint8(M));










Mask = [-1 0 1; -2 0 2; -1 0 1]; 

lena = imread('boats.pgm');

lena2=conv2(lena,Mask);

figure(1);
imshow(lena);

figure(2);
imshow(uint8(lena2));

F = fftshift(fft2(lena)); 
M = log(abs(F)+1); 
M = (M./max(max(M)))*255; 
figure(3);
imshow(uint8(M));


F = fftshift(fft2(lena2)); 
M = log(abs(F)+1); 
M = (M./max(max(M)))*255; 
figure(4);
imshow(uint8(M));









mask5x5 = [1/25 1/25 1/25 1/25 1/25;
        1/25 1/25 1/25 1/25 1/25;
        1/25 1/25 1/25 1/25 1/25;
        1/25 1/25 1/25 1/25 1/25;
        1/25 1/25 1/25 1/25 1/25];
mask7x7 = [1/49 1/49 1/49 1/49 1/49 1/49 1/49;
            1/49 1/49 1/49 1/49 1/49 1/49 1/49;
            1/49 1/49 1/49 1/49 1/49 1/49 1/49;
            1/49 1/49 1/49 1/49 1/49 1/49 1/49;
            1/49 1/49 1/49 1/49 1/49 1/49 1/49;
            1/49 1/49 1/49 1/49 1/49 1/49 1/49;
            1/49 1/49 1/49 1/49 1/49 1/49 1/49];
mask9x9 = [1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81; 
    1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81; 
    1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81; 
    1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81; 
    1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81; 
    1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81; 
    1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81; 
    1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81; 
    1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81 1/81];

mask11x11 = [1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121;
    1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121;
    1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121;
    1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121;
    1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121;
    1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121;
    1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121;
    1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121;
    1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121;
    1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121;
    1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121 1/121];

lena = imread('lena.pgm');

lena2=conv2(lena,mask5x5);
lena3=conv2(lena,mask7x7);
lena4=conv2(lena,mask9x9);
lena5=conv2(lena,mask11x11);

figure(1);
imshow(lena);

figure(2);
imshow(uint8(lena2));

figure(3);
imshow(uint8(lena3));
figure(4);
imshow(uint8(lena4));
figure(5);
imshow(uint8(lena5));