How can I find random pixels in an image?

2014 2 13
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更新时间：2014 2 13
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Hi all, I have a 256*256 pixels image and I want to have 5 randomly pixels in it.how can I do that?

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Faranak
Faranak 2014-2-13
I have some pixels with value more than 1 , I want to find randomly from those pixels. I tried this command : randi(size(imfinal),1,5) but it gives me random number of pixel number. I want exactly the number of i , j of the pixel,and those pixel which their value is more than 1 .

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Faranak
Faranak 2014-2-13

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I found the answer,for those who want it:
%%% imfinal is the image
for i=1:256 for j=1:256 if imfinal(i,j)>2 f=imfinal;
end
end
end
%%%% 1800 is the total number of pixels with value more than 1
fo=find(f>20); rndm=randi(1800,1,5); fo2=fo(rndm);

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Image Analyst
Image Analyst 2014-2-13
That does not do what you asked. The first loop merely assigns the entire image to f. The second part looks at only the first 1800 pixels with a value of more than 20 and picks the linear index of 5 of them.
It doesn't give you "number of i , j of the pixel" and doesn't look at "those pixel which their value is more than 1". But whatever...as long as you're happy.

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