void TrueClusterHistogram::hbof(const patch &descriptor,
Descriptor &histogram,
bool histogram_first){
typedef patch_collection::const_iterator pcit;
typedef Descriptor::iterator dcit;
// find closest cluster
size_t classification = 0;
float min_distance = 0;
bool first = true;
for(pcit i = centers.begin(); i != centers.end(); ++i){
float current_distance = (*i).distance(descriptor);
if(first == true || current_distance < min_distance){
min_distance = current_distance;
classification = i - centers.begin();
}
first = false;
}
// initialize histogram if applicable
if(histogram_first)
for(dcit i = histogram.begin(); i != histogram.end(); ++i)
*i = 0;
// increment closest center in the histogram
histogram[classification] += 1;
}
void TrueClusterHistogram::min(const patch &descriptor,
Descriptor &histogram,
bool first){
Descriptor::iterator h = histogram.begin();
patch_collection::iterator c = centers.begin();
while(h != histogram.end() && c != centers.end()){
float dist = descriptor.distance(*c);
if(first || dist < *h)
*h = dist;
h++;
c++;
}
}