How to calculate the mean of an image?
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How to calculate the mean of an image? Does the code mean2(img) give the right result?
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Image Analyst
2015 年 2 月 16 日
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
2015 年 2 月 16 日
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
2018 年 1 月 8 日
meanval = mean2(I) you can get mean value of an image
3 件のコメント
Image Analyst
2018 年 6 月 13 日
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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