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/********************************
Author: Sravanthi Kota Venkata
********************************/
#include "sift.h"
F2D* doubleSize(F2D* I)
{
F2D *J;
int M, N, i, j;
M = I->height;
N = I->width;
J = fSetArray(2*M, 2*N, 0);
for(i=0; i<M; i++)
{
for(j=0; j<N; j++)
{
subsref(J,2*i,j*2) = subsref(I,i,j);
}
}
for(i=0; i<M-1; i++)
{
for(j=0; j<N-1; j++)
{
subsref(J,i*2+1,j*2+1) = (0.25 * (subsref(I,i,j) + subsref(I,i+1,j) + subsref(I,i,j+1) + subsref(I,(i+1),j+1)));
}
}
for(i=0; i<M-1; i++)
{
for(j=0; j<N; j++)
{
subsref(J,i*2+1,j*2) = (0.5 * (subsref(I,i,j) + subsref(I,i+1,j)));
}
}
for(i=0; i<M; i++)
{
for(j=0; j<N-1; j++)
{
subsref(J,i*2,j*2+1) = (0.5 * (subsref(I,i,j) + subsref(I,i,j+1)));
}
}
return J;
}
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