Apply the Laplacian Filter in Matlab

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Rooter Boy
Rooter Boy 2020-11-15
编辑： Rooter Boy 2020-11-15
I have a question. I tried many time with different codes but i did not find answer. I am not sure in every time about my answer. I wonder how to find answer using with matlab.
I tried codes:
A=[14 12 10 12 11 10 13 7 9 16;
16 14 13 13 12 6 9 10 13 11;
16 14 12 13 11 8 9 11 11 3;
13 13 12 12 15 11 12 12 4 3,
16 9 4 12 14 8 9 21 11 5;
16 15 15 12 8 8 5 5 6 12;
12 11 13 11 13 4 4 3 2 5;
7 7 13 13 14 4 4 3 4 5;
8 11 5 12 12 4 5 4 4 5;
14 14 12 6 12 5 2 3 5 3]
%my first try
kernel = -1 * ones(3);
kernel(2,2) = 8; % Now kernel = [-1,-1,-1; -1,8,-1; -1,-1,-1]
output = conv2(A,kernel,'same');
%my second try
b=[0 1 0; 1 -4 1; 0 1 0]
c=conv2(A,b,'valid')
%my third try
b=[-1,-1,-1; -1,8,-1; -1,-1,-1]
c=conv2(A,b,'valid')
%my 4th try
A=uint8(A);
H = fspecial('laplacian',0,2)
T=imfilter(A,H);
I would be glad if you help.

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