Currently I am trying to convolve an image with a Gaussian function and am getting a white screen.
29 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
When I am trying to get the convolution I am getting blank screen. The code I have for this is given by:
p = imread('barphantom.png');
gp = rgb2gray(p)
figure, imshow(p) %shows the image
n = 1132;
m = 755;
sigma = 5
h = zeros(n,m);
for x=1:n
for y=1:m
h(x,y) = exp(-((x-n/2)^2+(y-m/2)^2)/(2*sigma^2));
end
end
figure, imshow(h) % shows the gaussian figure
k = conv2(gp, h,'same')
figure, imshow(k)
0 commentaires
Réponse acceptée
DGM
le 15 Fév 2022
Modifié(e) : DGM
le 15 Fév 2022
Sum-normalize the filter kernel
gp = imread('cameraman.tif');
n = 1132;
m = 755;
sigma = 5;
h = zeros(n,m);
for x=1:n
for y=1:m
h(x,y) = exp(-((x-n/2)^2+(y-m/2)^2)/(2*sigma^2));
end
end
h = h/sum(h(:)); % normalize the filter
%imshow(h) % shows the gaussian figure
k = conv2(im2double(gp), h,'same');
imshow(k)
Your filter also is wayyyy bigger than it needs to be. That only slows down the convolution. Depending on how much support you want, you can make it quite small. For comparison, imgaussfilt() creates the filter such that its width and height are 2*ceil(2*sigma)+1. You might want more support, so pick 2*ceil(3*sigma)+1 or 2*ceil(4*sigma)+1.
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Descriptive Statistics dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!