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

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

Answer 1

[KSSV]

doc mean2

[aditya kumar sahu]

i cant the answer

[KSSV]

Read abut mean2 https://in.mathworks.com/help/images/ref/mean2.html

Answer 2

[Jan]

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

Answer 3

[Image Analyst]

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));