MATLAB: How to find mean of the image

Question

Hi,

I am using this command for finding mean of the 10 images

mean(cat(3,IMG1,IMG2,IMG3,IMG4,IMG5,IMG6,IMG7,IMG8,IMG9,IMG10),3)

Here 3 is the dimension

Why to use 3 dimension here?

When I am using 2 dimensional I am not getting the answer.why?

can u suggest something about this

Thanks in advance

Answer 1

What dimension do you want to concatenate along and how do you want to take the mean?

X = mean(cat(2,randn(10,2),randn(10,2)),2);

Forms a matrix that is 10x4 and then takes the means of the rows to yield a 10x1 vector.

X = mean(cat(1,randn(10,2),randn(10,2)),1);

Forms a matrix that is 20x2 and takes the means of the columns to yield a 1x2 vector.

Wayne