normalization data to 0-255

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hakan
hakan 2023-5-3
评论： Les Beckham 2023-5-19
Hello eveyone ı have dataset which is this:
ineed to normalize each data to 0 to 255 .
my code :
T = dataset;
K=[,];
N=[,];
[row,col]= size (T);
for i=1:row
for j=1:col -1
K(i,j)=(table2array(T(i,j)));
N(i,j) =uint8(255*mat2gray(K(i,j)));
j=j+1;
end
i=i+1;
end
disp(N);
but when ı try to convert witn in for loop .ı got an output like this .almost all data was converted to 255 .
thx in advance

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采纳的回答

Les Beckham
Les Beckham 2023-5-3
编辑：Les Beckham 2023-5-3
Ran in:
format long g
A = [linspace(1, 10, 10); flip(linspace(3, 100, 10)); rand(1,10)].';
T = array2table(A, 'VariableNames', {'ID', 'air_time1', 'disp_index1'});
disp(T)
ID air_time1 disp_index1 __ ________________ __________________ 1 100 0.84937546191858 2 89.2222222222222 0.781075522933781 3 78.4444444444444 0.510734961244536 4 67.6666666666667 0.786284237473229 5 56.8888888888889 0.130286316030897 6 46.1111111111111 0.0499583876595915 7 35.3333333333333 0.602753314979179 8 24.5555555555556 0.0680553222279021 9 13.7777777777778 0.508040576553327 10 3 0.121193046028218
for iCol=1:width(T)
T(:,iCol) = T(:,iCol) - min(T(:,iCol)); % make the min value zero
columnMax = max(T(:,iCol));
columnMax = table2array(columnMax);
T(:,iCol) = T(:,iCol) .* (255 / columnMax); % make the max value 255
end
disp(T)
ID air_time1 disp_index1 ________________ ________________ ________________ 0 255 255 28.3333333333333 226.666666666667 233.213519573287 56.6666666666667 198.333333333333 146.979630592797 85 170 234.875007988193 113.333333333333 141.666666666667 25.6231976952331 141.666666666667 113.333333333333 0 170 85 176.331868564552 198.333333333333 56.6666666666667 5.7726041430836 226.666666666667 28.3333333333333 146.120169219777 255 0 22.7226043437182
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hakan
hakan 2023-5-18
Isolved the problem .Thanks
Les Beckham
Les Beckham 2023-5-19
You are quite welcome. Thank you for accepting the answer.

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