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/********************************
Author: Sravanthi Kota Venkata
********************************/
#include "stitch.h"
#include <math.h>
#define min(a,b) (a<b)?a:b
F2D* extractFeatures(I2D* I, F2D* x, F2D* y)
{
int n, i, j, k;
F2D* I1;
F2D *Iconv;
F2D *Isub;
int nr, nc;
F2D *w, *wt, *vecF;
I2D *Xsub, *Ysub;
float temp, mean, std;
int m;
F2D *g1, *g;
g1 = fSetArray(5,5,0);
asubsref(g1,0) = 1;
asubsref(g1,1) = 4;
asubsref(g1,2) = 6;
asubsref(g1,3) = 4;
asubsref(g1,4) = 1;
asubsref(g1,5) = 4;
asubsref(g1,6) = 16;
asubsref(g1,7) = 24;
asubsref(g1,8) = 16;
asubsref(g1,9) = 4;
asubsref(g1,10) = 6;
asubsref(g1,11) = 24;
asubsref(g1,12) = 36;
asubsref(g1,13) = 24;
asubsref(g1,14) = 6;
asubsref(g1,15) = 4;
asubsref(g1,16) = 16;
asubsref(g1,17) = 24;
asubsref(g1,18) = 16;
asubsref(g1,19) = 4;
asubsref(g1,20) = 1;
asubsref(g1,21) = 4;
asubsref(g1,22) = 6;
asubsref(g1,23) = 4;
asubsref(g1,24) = 1;
g = fDivide(g1, 256);
n = x->height;
vecF = fMallocHandle(n, 64);
I1 = fiDeepCopy(I);
Iconv = ffConv2(I1, g);
fFreeHandle(I1);
I1 = ffConv2(Iconv, g);
fFreeHandle(Iconv);
Iconv = fDeepCopy(I1);
{
int i = (Iconv->height/5);
int j = (Iconv->width/5);
Isub = fMallocHandle(i, j);
}
for(i=0, m=0; m<Isub->height; i+=5, m++)
{
for(j=0, k=0; k<Isub->width; j+=5, k++)
{
subsref(Isub,m,k) = subsref(Iconv,i,j);
}
}
fFreeHandle(Iconv);
fFreeHandle(g1);
fFreeHandle(g);
fFreeHandle(I1);
nr = Isub->height;
nc = Isub->width;
Xsub = iMallocHandle(x->height, x->width);
Ysub = iMallocHandle(y->height, y->width);
// printf("Sizes = %d\t%d\t%d\t%d\n", Isub->height, Isub->width, x->height, x->width);
for(i=0; i<(x->height*x->width); i++)
{
asubsref(Xsub,i) = min( ( asubsref(x,i) /5), nc-4 );
asubsref(Ysub,i) = min( ( asubsref(y,i) /5), nr-4 );
}
{
int maxX, maxY;
maxX = Xsub->height>Xsub->width?Xsub->height:Xsub->width;
maxY = Ysub->height>Ysub->width?Ysub->height:Ysub->width;
if(maxX < 6 || maxY < 10)
{
fFreeHandle(vecF);
vecF = fSetArray(n,2,0);
for(i=0; i<(x->height); i++)
{
subsref(vecF, i, 0) = asubsref(Xsub,i)*1.0;
subsref(vecF, i, 1) = asubsref(Ysub,i)*1.0;
}
fFreeHandle(Isub);
iFreeHandle(Xsub);
iFreeHandle(Ysub);
return vecF;
}
}
{
int newSize = 4;
if(I->height > 32 && I->width >32)
newSize = 64;
fFreeHandle(vecF);
vecF = fMallocHandle(n, newSize);
}
// printf("Size of Isub = %d\t%d\n", Isub->height, Isub->width);
for(i=0; i<n; i++)
{
if( asubsref(Ysub,i) < 3)
asubsref(Ysub,i) = 3;
if( asubsref(Xsub,i) < 3)
asubsref(Xsub,i) = 3;
if( asubsref(Ysub,i) >= (Isub->height-4))
asubsref(Ysub,i) = Isub->height-5;
if( asubsref(Xsub,i) >= (Isub->width-4))
asubsref(Xsub,i) = Isub->width-5;
m = 0;
temp = 0;
// printf("SUBS %d\t%d\n", asubsref(Ysub,i), asubsref(Xsub,i));
for(k= asubsref(Xsub,i)-3; k<=( asubsref(Xsub,i)+4); k++)
{
for(j= asubsref(Ysub,i)-3; j<=( asubsref(Ysub,i)+4); j++)
{
// printf("%d\t%d\n", j, k);
subsref(vecF,i,m) = subsref(Isub,j,k);
temp += subsref(vecF,i,m);
m++;
}
}
mean = temp/64.0;
std = 0;
for(j=0; j<64; j++)
{
subsref(vecF,i,j) = subsref(vecF,i,j) - mean;
std += subsref(vecF,i,j) * subsref(vecF,i,j);
}
std = std/64;
std = sqrt(std);
for(j=0; j<64; j++)
{
subsref(vecF,i,j) = subsref(vecF,i,j)/std;
}
}
iFreeHandle(Xsub);
fFreeHandle(Isub);
iFreeHandle(Ysub);
return vecF;
}
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