medical image analysis SVN (old)

/* -*- mia-c++  -*-
 *
 * Copyright (c) 2007 Gert Wollny <gert dot wollny at acm dot org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <mia/2d/transform.hh>
#include <mia/2d/deformer.hh>

NS_MIA_BEGIN


C2DGridTransformation::C2DGridTransformation(const C2DBounds& size, P2DInterpolatorFactory  ipf):
	_M_field(size), 
	_M_ipf(ipf)
{
}

C2DFVectorfield& C2DGridTransformation::field()
{
	return _M_field; 
}

P2DInterpolatorFactory C2DGridTransformation::get_ipf()
{
	return _M_ipf; 
}

C2DGridTransformation& C2DGridTransformation::operator += (const C2DGridTransformation& other)
{
	_M_field = (*this + other).field(); 
	return *this; 
}

C2DGridTransformation C2DGridTransformation::operator + (const C2DGridTransformation& other)
{
	assert(_M_field.get_size() == other._M_field.get_size()); 
	
	C2DGridTransformation tmp(_M_field.get_size(), _M_ipf); 
	
	C2DFVectorfield::iterator itmp = tmp._M_field.begin();
	C2DFVectorfield::const_iterator ib = other._M_field.begin(); 

	for (size_t y = 0; y < _M_field.get_size().y; ++y)  {
		for (size_t x = 0; x < _M_field.get_size().x; ++x, ++itmp, ++ib)  {
			C2DFVector xi = C2DFVector(x, y) - *ib;
			*itmp = _M_field.get_interpol_val_at(xi) +  *ib;
		}
	}
	return tmp; 
}

void C2DGridTransformation::apply(const C2DImage& input, C2DImage& output) const
{
	FDeformer2D deformer(_M_field, *_M_ipf); 
	output = *mia::filter(deformer, input); 
}

C2DGridTransformation C2DGridTransformation::upscale(const C2DBounds& size)
{
	C2DGridTransformation result(size, _M_ipf); 

	// initial upscale 
	if (_M_field.get_size().x == 0 || _M_field.get_size().y == 0)
		return result; 

	float x_mult = float(size.x) / (float)_M_field.get_size().x; 
	float y_mult = float(size.y) / (float)_M_field.get_size().y;
	float ix_mult = 1.0f / x_mult; 
	float iy_mult = 1.0f / y_mult; 
	
	C2DFVectorfield::iterator i = result._M_field.begin();
	
	for (unsigned int y = 0; y < size.y; y++){
		for (unsigned int x = 0; x < size.x; x++,++i){
			C2DFVector help(ix_mult * x, iy_mult * y);
			C2DFVector val = _M_field.get_interpol_val_at(help);
			*i = C2DFVector(val.x * x_mult,val.y * y_mult);
		}
	}
	return result;
}



NS_MIA_END