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Summation Equation in matlab code

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Sajina Rose
Sajina Rose 2019-10-28
回答： Wisal Adnan 2020-8-19
How can I write this summation equation in matlab ?
N is the number of pixel in the image

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Bhaskar R
Bhaskar R 2019-10-28
Assuming are vectocrs of the length number of pixels in the image(N)
sigma = (1/N)*sum(C.^2-mu.^2);
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Bhaskar R
Bhaskar R 2019-10-28
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 2019-10-28
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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Wisal Adnan
Wisal Adnan 2020-8-19
hi please can tell me how make this eq. in matlab
where n start from 2 , m&c constant value

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