contrib/mul/mfpf/mfpf_ssd_vec_cost.cxx

Go to the documentation of this file.

#include "mfpf_ssd_vec_cost.h"
//:
// \file
// \brief Computes weighted sum of square differences to a mean
// \author Tim Cootes

#include <vsl/vsl_binary_loader.h>
#include <vcl_cassert.h>

#include <vnl/io/vnl_io_vector.h>

//=======================================================================
// Dflt ctor
//=======================================================================

mfpf_ssd_vec_cost::mfpf_ssd_vec_cost()
{
}

//=======================================================================
// Destructor
//=======================================================================

mfpf_ssd_vec_cost::~mfpf_ssd_vec_cost()
{
}

//: Define mean and weights
void mfpf_ssd_vec_cost::set(const vnl_vector<double>& mean,
                            const vnl_vector<double>& wts)
{
  assert(mean.size()==wts.size());
  mean_=mean;
  wts_ =wts;
}

//: Evaluate weighted sum of absolute difference from mean
double mfpf_ssd_vec_cost::evaluate(const vnl_vector<double>& v)
{
  double sum=0;
  for (unsigned i=0;i<v.size();++i)
  {
    sum += wts_[i]*(v[i]-mean_[i])*(v[i]-mean_[i]);
  }
  return sum;
}

//: Return the mean
void mfpf_ssd_vec_cost::get_average(vnl_vector<double>& v) const
{
  v=mean_;
}


//=======================================================================
// Method: version_no
//=======================================================================

short mfpf_ssd_vec_cost::version_no() const
{
  return 1;
}

//=======================================================================
// Method: is_a
//=======================================================================

vcl_string mfpf_ssd_vec_cost::is_a() const
{
  return vcl_string("mfpf_ssd_vec_cost");
}

//: Create a copy on the heap and return base class pointer
mfpf_vec_cost* mfpf_ssd_vec_cost::clone() const
{
  return new mfpf_ssd_vec_cost(*this);
}

//=======================================================================
// Method: print
//=======================================================================

void mfpf_ssd_vec_cost::print_summary(vcl_ostream& os) const
{
  os<<"Size: "<<mean_.size()<<" Mean Wt: "<<wts_.mean();
}

//=======================================================================
// Method: save
//=======================================================================

void mfpf_ssd_vec_cost::b_write(vsl_b_ostream& bfs) const
{
  vsl_b_write(bfs,version_no());
  vsl_b_write(bfs,mean_);
  vsl_b_write(bfs,wts_);
}

//=======================================================================
// Method: load
//=======================================================================

void mfpf_ssd_vec_cost::b_read(vsl_b_istream& bfs)
{
  if (!bfs) return;
  short version;
  vsl_b_read(bfs,version);
  switch (version)
  {
    case (1):
      vsl_b_read(bfs,mean_);
      vsl_b_read(bfs,wts_);
      break;
    default:
      vcl_cerr << "I/O ERROR: vsl_b_read(vsl_b_istream&)\n"
               << "           Unknown version number "<< version << vcl_endl;
      bfs.is().clear(vcl_ios::badbit); // Set an unrecoverable IO error on stream
      return;
  }
}