/*!
Train the classifier on a region of the entire image. The region is a
rectangle. The parameters of this rectangle must be given in pixel. It also
includes the training of the fern classifier.
\param _I : The image use to train the classifier.
\param _rectangle : The rectangle defining the region of interest (ROI).
\return The number of reference points.
*/
unsigned int
vpPlanarObjectDetector::buildReference(const vpImage<unsigned char> &_I,
const vpRect _rectangle)
{
unsigned int res = fern.buildReference(_I, _rectangle);
vpImagePoint iP = _rectangle.getTopLeft();
modelROI.x = (int)iP.get_u();
modelROI.y = (int)iP.get_v();
modelROI.width = (int)_rectangle.getWidth();
modelROI.height = (int)_rectangle.getHeight();
initialiseRefCorners(modelROI);
return res;
}
