How do i improve this loop?

[row column page] = size(Image3)

for i = row

for j = column

if Image3 (i, j, 1) > 350

if Image3 (i, j, 2) > 350

if Image3 (i, j, 3) > 350

Image3 (i, j, 1) = 0.0;

Image3 (i, j, 2) = 0.0;

Image3 (i, j, 3) = 0.0;

end

end

end

end

end

I tried this:

mask = Image3(:,:,1)>350 & Image3(:,:,2) > 350 & Image3(:,:,3) > 350;

Image3 = Image3 .* mask(:,:,[1 1 1]);

But it doesn't work. Just displays a black image. What am i doing wrong?

Answer 1

[jgg]

Your approach should work. Try this instead:

 Image3 = randn(10,10,3)+355; %example data
 mask = Image3(:,:,1) > 350 & Image3(:,:,2) > 350 & Image3(:,:,3) > 350;
 mask = repmat(mask,1,1,3);
 Image3(mask) = 0.0;

[charuleelaa vanilavarasu]

Still doesn't work. This is what i get when i ran the above code.

[jgg]

You need to post your code; this code works fine. You have something unexpected going on with your Image3 matrix. Are you sure it has anything in which those three criteria are met?