let x is an image of m*n (512*512) pixel how to find the mean of x, what is the matlab code

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aditya kumar sahu
aditya kumar sahu 2016-12-20
回答： Image Analyst 2016-12-20
let x is an image of m*n (512*512) pixel how to find the mean of x, what is the matlab code

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回答（3 个）

KSSV
KSSV 2016-12-20
doc mean2
Jan
Jan 2016-12-20
编辑：Jan 2016-12-20
Instead of mean2 you can easily use:
xm = mean(x(:))
But note, that this answer is trivial. Searching the documentation would have solved this also:
docsearch mean
Image Analyst
Image Analyst 2016-12-20
Using mean() or mean2() is so obvious that I'm wondering if you actually wanted something different. Here are some related alternatives.
If you want a local/moving mean instead of the mean of the entire image, you can use conv2() or imfilter().
windowSize = 5;
kernel = ones(windowSize) / windowSize^2;
out = conv2(double(grayImage), kernel, 'same');
If you want the mean of tiles/blocks, you can use blockproc(). Demos attached.
If you want the mean in only part of an image that is defined by a mask, you can do
meanWithinMask = mean(grayImage(mask));

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