how can i make the result number from convolution become positive?

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pandu hanifa
pandu hanifa 2018-12-20
回答： Brian Hart 2018-12-20
this is the resultCapture.PNG
and this the script;
img=imread('albert.jpg');
F=size(img);
G = [0 -1 0;-1 4 -1;0 -1 0];
FxG = F;
% Konvolusi
[bf, kf] = size(F);
[bg, kg] = size(G);
m2 = floor(bg/2);
n2 = floor(kg/2);
% Penambahan elemen nol
pad = zeros(bf+4,kf+4);
pad(3:bf+2,3:kf+2) = F;
[b_pad,k_pad] = size(pad);
for i = m2+1 : b_pad-m2;
for j = n2+1 : k_pad-n2;
temp = 0;
for k = -m2: m2;
for l = -n2: n2;
temp = temp + G(k + m2+1,l+n2+1) * pad(i-k,j-l);
end
end
FxG(i,j) = temp;
end
end
FxG = FxG(2:bf+3,2:kf+3);

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回答（1 个）

Brian Hart
Brian Hart 2018-12-20
Convolution results can be negative.
If you want only positive results, two options are to either take the absolute value of the result, or find the minimum (negative) value in the result, then add its absolute value to the result (shifting all the values positive).

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