How to calculate the mean of an image?
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bh dhouha
le 16 Fév 2015
Commenté : Kweku Nkrumah
le 15 Juin 2018
How to calculate the mean of an image? Does the code mean2(img) give the right result?
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Image Analyst
le 16 Fév 2015
To calculate the mean of all pixels in the image, without regard to what color channel they came from (if it's a color image), you do
meanIntensity = mean(img(:));
What you did will not do it, as I'm sure you found out.
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Image Analyst
le 16 Fév 2015
It could be the same if the image was gray since the blue and green channel would be identical to the red channel. It would also be the same for lots of other cases, like where the green and blue channels are scrambled (spatially rearranged) versions of the red channel since they would have the same pixel values regardless of how they're rearranged.
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Rashmi.D Jeya kumar
le 8 Jan 2018
meanval = mean2(I) you can get mean value of an image
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Image Analyst
le 13 Juin 2018
Why does that mean anything is wrong? Maybe you took a bunch of photos through a microscope and they all have the same mean brightness (or really close to each other). Doesn't seem inherently unusual to me. Why do you think it indicates something is wrong?
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