/********************************
Author: Sravanthi Kota Venkata
********************************/

#include <stdio.h>
#include <stdlib.h>
#include "sift.h"

F2D* halveSize(F2D* I)
{
    F2D *J;
    int i, j, k;
    int hM, hN;
    int M, N;

    M = I->height;
    N = I->width;
    
    hM = (M+1)/2;
    hN = (N+1)/2;

    J = fSetArray(hM, hN, 0.0);

    k = 0;
    for(i=0; i<M; i+=2)
    {
        for(j=0; j<N; j+=2)
        {
            asubsref(J,k++) = subsref(I,i,j);
        }
    }

    return J;
}