MATLAB: Can any one provide me the code for dividing the image 306×204 into blocks of size i,e windows of size 17×17

digital image processing

i want to know the code for dividing the image into blocks or windows of size 17×17

im=rand(306,204)
[n,m]=size(im)
[ii,jj]=ndgrid(1:17:n,1:17,m)
out=arrayfun(@(x,y) im(x:x+16,y:y+16),ii,jj,'un',0)

Here is an an example showing how to create the design and testbench MATLAB code.

Hi, you need to compute second derivatives in each direction, using something like:

 [gx, gy] = gradient(double(img));
 [gxx, gxy] = gradient(gx);
 [gxy, gyy] = gradient(gy);

The coefficients of the hessian matrix for each pixel are given by gxx, gxy and gyy.

regards