window fixing

sir i have a image of size(mXn),i need to count black pixel from pixel(i j) with window size(32X64)

 i am not geting how to fix window of(32X64) sir plz help me in coading

[Walter Roberson]

Do you mean go 16 pixels above to 16 below, and 32 pixels left to 32 right, and count the black pixels in that block?

If so then I note those are even numbers on each side, so there is no natural "central" pixel. How exactly do you want this window positioned with respect to a particular pixel ?

Answer 1

[the cyclist]

It is not clear to me what you want, but to get a section 32x64 from coordinates i,j use:

 pixel(i:i+31,j:j+63)