Impala Documentation

void Impala::Core::Feature::ExtractFeatureIntoVector	(	std::vector< Real64 > &	vector,
		std::vector< Array::Array2dScalarReal64 * > &	features,
		int	x,
		int	y,
		int	spaciality
	)			`[inline]`

subroutine of DSurf - extract from the collection of images 'features'; at the point (x,y) a feature that we will store in vector 'v' x and y are assumed to be in range of the image considering spaciality

Definition at line 38 of file DSurf.h.

Referenced by DSurf().

00041 {
00042     double length = 0.;
00043     int begin = vector.size();
00044     vector.reserve(begin + (features.size()*spaciality*spaciality));
00045     for(int f=0 ; f<features.size() ; ++f)
00046     {
00047         for(int j=y ; j<y+spaciality ; ++j)
00048             for(int i=x ; i<x+spaciality ; ++i)
00049             {
00050                 double v = features[f]->Value(i,j);
00051                 vector.push_back(v);
00052                 length += v*v;
00053             }
00054     }
00055     // normalize the vector that we just added (so ignore the part before
00056     // 'begin')
00057     if(length != 0)
00058     {
00059         length = sqrt(length);
00060         for(int i=begin ; i<vector.size() ; ++i)
00061             vector[i] /= length;
00062     }
00063 }