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Summation Equation in matlab code

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Sajina Rose
Sajina Rose on 28 Oct 2019
Answered: Wisal Adnan on 19 Aug 2020
How can I write this summation equation in matlab ?
N is the number of pixel in the image

Accepted Answer

Bhaskar R
Bhaskar R on 28 Oct 2019
Assuming are vectocrs of the length number of pixels in the image(N)
sigma = (1/N)*sum(C.^2-mu.^2);
  3 Comments
Bhaskar R
Bhaskar R on 28 Oct 2019
Any image considered as an array in MATLAB i.e number of the array elemets are the number of the pixels in the image.
In your case number of pixels in 2D image is
% using command
N = numel(image); % this is the command to count of 2D image
% using rows and columns
[rows, columns, dim] = size(image);
N = rows*columns*dim;
Walter Roberson
Walter Roberson on 28 Oct 2019
numel() of a grayscale image. size(TheImage,1)*size(TheImage,2) to know the number of pixels for RGB.
The posted code can be simplified by using
mean(C.^2-mu.^2)
Notice that the code is for the vector case, not for the 2D case. N cannot be the number of pixels because you are only using a single subscript.

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More Answers (1)

Wisal Adnan
Wisal Adnan on 19 Aug 2020
hi please can tell me how make this eq. in matlab
where n start from 2 , m&c constant value

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