How can we apply the standard deviation?

In the following code image was divided into 8 * 8 blocks

    Image=rgb2gray(imread('1.jpg')); [m n]=size(Image);
Nbrx = floor(m./8); Nbry = floor(n./8); Nd=1;
for i=1:Nbrx
    for j=1:Nbry
   Mat=Image((i-1)*8+1:i*8,(j-1)*8+1:j*8);
        subplot(Nbrx,Nbry,Nd); imshow(Mat)
        Nd=Nd+1;
    end
end

How can we apply the standard deviation on each block

Answer 1

[Dishant Arora]

doc blockproc

It operates given function on an image block by block, so will get rid of the code you wrote above to partition the image. And std gives standard deviation.