// static
cv::Mat_<float> CrossValidator::createCrossValidationMatrix( const vector< const vector<cv::Mat_<float> >* >& rowVectors,
cv::Mat_<int>& labels)
{
assert( !rowVectors.empty());
cv::Mat_<float> vecs;
labels.create( 0,1);
for ( int label = 0; label < rowVectors.size(); ++label)
{
assert( rowVectors[label] != 0);
const vector<cv::Mat_<float> >& rvecs = *rowVectors[label];
assert( !rvecs.empty());
const int colDim = rvecs[0].cols; // Should be the length of each row vector in this class
if ( vecs.empty())
vecs.create(0, colDim);
assert( colDim == vecs.cols); // Ensure this class's row vector length matches what's already stored
for ( int i = 0; i < rvecs.size(); ++i)
{
const cv::Mat_<float>& rv = rvecs[i];
if ( rv.rows != 1 || rv.cols != colDim)
{
std::cerr << "ERROR feature vector size: " << rv.size() << std::endl;
assert( rv.rows == 1 && rv.cols == colDim);
} // end if
vecs.push_back( rv); // Append the row vector to the bottom of the matrix
labels.push_back(label); // Set this vector's class label
} // end for
} // end for
labels = labels.t(); // Make row vector
return vecs;
} // end createCrossValidationMatrix
bool from_file( const std::string& fname, cv::Mat_<T>& out_mat,
std::function< void(const std::string&, const int line) > error_invalid_mat_callback = on_invalid_mat) {
bool ret;
out_mat.release();
ret = getlines_from_file(
fname,
[&]( string& line, uint line_nr) {
std::vector<T> v = from_string<T,vector>( line);
if( v.size()==0 || out_mat.rows != 0 && v.size() != out_mat.cols) {
error_invalid_mat_callback(fname, line_nr);
ret = false;
} else {
out_mat.push_back( cv::Mat_<T>(cv::Mat_<T>(v).t())); // not gonna love the MatExpr
}
});
return ret;
}
// Pick only the more stable/rigid points under changes of expression
void extract_rigid_points(cv::Mat_<double>& source_points, cv::Mat_<double>& destination_points)
{
if(source_points.rows == 68)
{
cv::Mat_<double> tmp_source = source_points.clone();
source_points = cv::Mat_<double>();
// Push back the rigid points (some face outline, eyes, and nose)
source_points.push_back(tmp_source.row(1));
source_points.push_back(tmp_source.row(2));
source_points.push_back(tmp_source.row(3));
source_points.push_back(tmp_source.row(4));
source_points.push_back(tmp_source.row(12));
source_points.push_back(tmp_source.row(13));
source_points.push_back(tmp_source.row(14));
source_points.push_back(tmp_source.row(15));
source_points.push_back(tmp_source.row(27));
source_points.push_back(tmp_source.row(28));
source_points.push_back(tmp_source.row(29));
source_points.push_back(tmp_source.row(31));
source_points.push_back(tmp_source.row(32));
source_points.push_back(tmp_source.row(33));
source_points.push_back(tmp_source.row(34));
source_points.push_back(tmp_source.row(35));
source_points.push_back(tmp_source.row(36));
source_points.push_back(tmp_source.row(39));
source_points.push_back(tmp_source.row(40));
source_points.push_back(tmp_source.row(41));
source_points.push_back(tmp_source.row(42));
source_points.push_back(tmp_source.row(45));
source_points.push_back(tmp_source.row(46));
source_points.push_back(tmp_source.row(47));
cv::Mat_<double> tmp_dest = destination_points.clone();
destination_points = cv::Mat_<double>();
// Push back the rigid points
destination_points.push_back(tmp_dest.row(1));
destination_points.push_back(tmp_dest.row(2));
destination_points.push_back(tmp_dest.row(3));
destination_points.push_back(tmp_dest.row(4));
destination_points.push_back(tmp_dest.row(12));
destination_points.push_back(tmp_dest.row(13));
destination_points.push_back(tmp_dest.row(14));
destination_points.push_back(tmp_dest.row(15));
destination_points.push_back(tmp_dest.row(27));
destination_points.push_back(tmp_dest.row(28));
destination_points.push_back(tmp_dest.row(29));
destination_points.push_back(tmp_dest.row(31));
destination_points.push_back(tmp_dest.row(32));
destination_points.push_back(tmp_dest.row(33));
destination_points.push_back(tmp_dest.row(34));
destination_points.push_back(tmp_dest.row(35));
destination_points.push_back(tmp_dest.row(36));
destination_points.push_back(tmp_dest.row(39));
destination_points.push_back(tmp_dest.row(40));
destination_points.push_back(tmp_dest.row(41));
destination_points.push_back(tmp_dest.row(42));
destination_points.push_back(tmp_dest.row(45));
destination_points.push_back(tmp_dest.row(46));
destination_points.push_back(tmp_dest.row(47));
}
}
