Problem with gaussian MF

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Dani D
Dani D 2017-3-8
Hello, I want fuzzification an image with gaussian membership function. But i don't know what is the best or optimal or basic C and sigma? Thanks
clc;
clear ;
close all;
I = imread('gc13.jpg');
img = I;
C = mean2(img);
SIGMA = std2(img);
X = exp(-(img - C).^2/(2*SIGMA^2));
imshow(A);

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