placing 3 image pixels in an array from a large image vector

I have a 256X256 image array, I am placing a 3X3 window over it and scanning for uncorrupted pixels. Suppose I got 3 pixels which are uncorrupted which I want to put in a vector form for ex-

I got 3 uncorrupted pixels in Matlab which are

I(i,j)= 49
I(i,j)= 36
I(i,j)= 109 

I want to put them in this form :

Z=[49 36 109];

Please provide the matlab code for doing this

Answer 1

[KSSV]

YOu know ths sub-indices (i,j) for the required pixels. Get the index for it and arrange in a vector.

idx = sub2ind(size(I),i,j) ; % I should be a 2D matrix
Z = I(idx) ;