URL: https://svn.lrde.epita.fr/svn/oln/branches/cleanup-2008/milena/sandbox ChangeLog: 2008-10-24 Jimmy Ma <jimmy.ma@lrde.epita.fr> Fix the skeleton algorithm introduced by aroumougame. * garrigues/ocr/skeleton.cc, garrigues/ocr/skeleton.hh: New. The code has been updated to work with the current version of milena. However, the code itself has to be cleaned and improved. --- skeleton.cc | 30 ++ skeleton.hh | 611 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 641 insertions(+) Index: branches/cleanup-2008/milena/sandbox/garrigues/ocr/skeleton.hh =================================================================== --- branches/cleanup-2008/milena/sandbox/garrigues/ocr/skeleton.hh (revision 0) +++ branches/cleanup-2008/milena/sandbox/garrigues/ocr/skeleton.hh (revision 2670) @@ -0,0 +1,611 @@ +// Copyright (C) 2007, 2008 EPITA Research and Development Laboratory +// +// This file is part of the Olena Library. This library is free +// software; you can redistribute it and/or modify it under the terms +// of the GNU General Public License version 2 as published by the +// Free Software Foundation. +// +// This library 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 library; see the file COPYING. If not, write to +// the Free Software Foundation, 51 Franklin Street, Fifth Floor, +// Boston, MA 02111-1307, USA. +// +// As a special exception, you may use this file as part of a free +// software library without restriction. Specifically, if other files +// instantiate templates or use macros or inline functions from this +// file, or you compile this file and link it with other files to +// produce an executable, this file does not by itself cause the +// resulting executable to be covered by the GNU General Public +// License. This exception does not however invalidate any other +// reasons why the executable file might be covered by the GNU General +// Public License. +#ifndef SKELETON_HH +# define SKELETON_HH + +#include <mln/core/image/image2d.hh> +#include <mln/core/alias/neighb2d.hh> +#include <sandbox/aroumougame/skeleton/sedt.hh> + +#include <mln/core/site_set/p_set.hh> +#include <mln/math/sqrt.hh> + +namespace mln +{ + + +template <typename P> + std::vector< std::pair< double, P > > remove(std::vector< std::pair< double, P > > Q, P p) +{ + typename std::vector<std::pair< double, P > >::iterator it; + + for(it = Q.begin(); it!=Q.end(); it++) + { + if((*it).second==p) + { + it = Q.erase(it); + break; + } + } + return Q; +} +template <typename N> + double distance(N a, N b, N c, N d) +{ + double dist = sqrt((a-c)*(a-c)+(b-d)*(b-d)); + return dist; +} +template <typename P> + std::vector< std::pair< double, P > > insertDicho(std::vector< std::pair< double, P > > Q, std::pair< double, P> p) +{ + int indMin, indMax, indMid; + + indMin = 0; + indMax = Q.size(); + + if(indMax==0 || Q[indMax-1].first <= p.first) + Q.push_back(p); + else + { + while(indMax > indMin) + { + indMid = int(indMin + (indMax-indMin)/2); + if(Q[indMid].first < p.first) + { + indMin = indMid+1; + if(Q[indMin].first > p.first) + { + indMax = indMid; + } + } + else + { + indMax = indMid-1; + if(Q[indMax].first < p.first) + { + indMin = indMid; + } + } + } + + typename std::vector< std::pair< double, P > >::iterator it=Q.begin(); + it = Q.insert ( it+indMin, p); + } + + return Q; +} + + +const neighb2d& complement_neighborhood(const Neighborhood<neighb2d>& nbh) +{ + if(&nbh == &c4()) + return c8(); + return c4(); +} + +template <typename N> + int nb_composant_connexe(p_set< mln_psite(N) > X_full,const Neighborhood<N>& nbh_,const mln_psite(N)& p_ref, bool local) +{ + N nbh = exact(nbh_); + p_set< mln_psite(N) > X; + if(local) + { + mln_niter(N) n(max_neighborhood(nbh), p_ref); + + for_all(n) + { + if (X_full.has(n)) + X.insert(n); + } + } + else + { + X = X_full; + } + + int T; + p_set< mln_psite(N) > done; + p_set< mln_psite(N) > neighbors; + p_set< mln_psite(N) > composant; + + done.insert(p_ref); + mln_niter(N) q(nbh, p_ref); + for_all(q) + { + if (X.has(q)&&!done.has(q)) + { + neighbors.insert(q); + } + } +// std::cout << "nb_composant_connexe: neighbors " << neighbors.nsites() <<std::endl; + if(neighbors.nsites()<=1) + { + return neighbors.nsites(); + } + else + T=0; + + while(neighbors.nsites()!=0) + { + T++; + done.insert(neighbors[0]); + mln_niter(N) t(nbh, neighbors[0]); + neighbors.remove(neighbors[0]); + for_all(t) + { + if (X.has(t)&&!done.has(t)) + { + composant.insert(t); + } + } + + while(composant.nsites()!=0) + { + done.insert(composant[0]); + if(neighbors.has(composant[0])) + { + neighbors.remove(composant[0]); + if(neighbors.nsites()==0) + return T; + } + + mln_niter(N) r(nbh, composant[0]); + composant.remove(composant[0]); + for_all(r) + { + if (X.has(r) && !done.has(r)) + { + composant.insert(r); + } + } + } + } + return T; +} + +template <typename N> + bool simple_point(p_set< mln_psite(N) > X,const Neighborhood<N>& nbh, p_set< mln_psite(N) > X_complement, const mln_psite(N)& p_ref, bool local) +{ + int nX = nb_composant_connexe(X,exact(nbh),p_ref,local); + int nX_complement = nb_composant_connexe(X_complement,complement_neighborhood(exact(nbh)),p_ref,local); + + if((nX_complement == 1)&&(nX == 1)) + return true; + return false; +} + + + template <typename N> + p_set<mln_psite(N)> euclideanSkeleton(p_set<mln_psite(N)> X, p_set<mln_psite(N)> X_complement, image2d<value::int_u8> dt, p_set<mln_psite(N)>& Y, const Neighborhood<N>& nbh_, bool local) + { + std::vector< std::pair< double, mln::point2d> > Q; + std::vector< std::pair< double, mln::point2d> > R; + N nbh = exact(nbh_); + + // fill Q + for (uint i = 0; i < X.nsites(); i++) + { + if (!Y.has(X[i])) + { + std::pair<double, mln_psite(N)> p(math::sqrt(double(dt(X[i]))),X[i]); + Q = insertDicho(Q,p); + } + } + + // fill R + for (uint i = 0; i < X.nsites(); i++) + { + if (!Y.has(X[i])) + { + double min = 1023.99; + mln_niter(N) r(nbh, X[i]); + for_all(r) + { + if (Y.has(r)) + { + double tmp = distance(r[0], r[1], X[i][0], X[i][1]); + double d = math::sqrt(double(dt(r)))+(math::sqrt(double(dt(X[i])))-math::sqrt(double(dt(r))))/tmp; + min = math::min(min,d); + } + } + if (min!=1023.99) + { + std::pair<double, mln_psite(N)> p(min,X[i]); + R = insertDicho(R, p); + } + } + } + + while (!Q.empty() || !R.empty()) + { + mln_psite(N) tmp; + if (Q[0].first < R[0].first) + { + tmp = Q[0].second; + } + else + { + tmp = R[0].second; + } + + Q = remove(Q, tmp); + R = remove(R, tmp); + + if (!Y.has(tmp) && X.has(tmp)) + { + if (simple_point(X, nbh, X_complement, tmp, local)) + { + X.remove(tmp); + X_complement.insert(tmp); + } + else + { + Y.insert(tmp); + mln_niter(N) r(nbh, tmp); + for_all(r) + { + if (!Y.has(r) && X.has(r)) + { + double dist = distance(r[0], r[1], tmp[0], tmp[1]); + double d = math::sqrt(double(dt(tmp)))+(math::sqrt(double(dt(r)))-math::sqrt(double(dt(tmp))))/dist; + std::pair<double, mln_psite(N)> p(d,r); + R = insertDicho(R, p); + } + } + + } + } + + } + return X; + } + + + p_set<point2d> EP(image2d<value::int_u8> dt, point2d x, std::vector< std::vector<std::pair< int, int> > > lut, const neighb2d& nbh) + { + p_set<point2d> EP; + p_set<point2d> tmp; + int w = geom::ncols(dt); + int h = geom::nrows(dt); + + + mln_niter_(neighb2d) r(nbh, x); + for_all(r) + { + if (dt(r) <= dt(x)) + { + for (uint i=0; i<lut[dt(r)].size(); i++) + { + if ((r[0]+lut[dt(r)][i].first < h) && (r[1]+lut[dt(r)][i].second < w)) + { + if (!dt(r+dpoint2d(lut[dt(r)][i].first, lut[dt(r)][i].second))) + EP.insert(r+dpoint2d(lut[dt(r)][i].first, lut[dt(r)][i].second)); + } + if ((r[0]-lut[dt(r)][i].first >= 0) && (r[1]-lut[dt(r)][i].second >= 0)) + { + if (!dt(r+dpoint2d(-lut[dt(r)][i].first, -lut[dt(r)][i].second))) + EP.insert(r+dpoint2d(-lut[dt(r)][i].first, -lut[dt(r)][i].second)); + } + if ((r[0]+lut[dt(r)][i].first < h) && (r[1]-lut[dt(r)][i].second >= 0)) + { + if (!dt(r+dpoint2d(lut[dt(r)][i].first, -lut[dt(r)][i].second))) + EP.insert(r+dpoint2d(lut[dt(r)][i].first, -lut[dt(r)][i].second)); + } + if ((r[0]-lut[dt(r)][i].first >= 0) && (r[1]+lut[dt(r)][i].second < w)) + { + if (!dt(r+dpoint2d(-lut[dt(r)][i].first, lut[dt(r)][i].second))) + EP.insert(r+dpoint2d(-lut[dt(r)][i].first, lut[dt(r)][i].second)); + } + if ((r[0]+lut[dt(r)][i].second < h) && (r[1]+lut[dt(r)][i].first < w)) + { + if (!dt(r+dpoint2d(lut[dt(r)][i].second, lut[dt(r)][i].first))) + EP.insert(r+dpoint2d(lut[dt(r)][i].second, lut[dt(r)][i].first)); + } + if ((r[0]-lut[dt(r)][i].second >= 0) && (r[1]-lut[dt(r)][i].first >= 0)) + { + if (!dt(r+dpoint2d(-lut[dt(r)][i].second, -lut[dt(r)][i].first))) + EP.insert(r+dpoint2d(-lut[dt(r)][i].second, -lut[dt(r)][i].first)); + } + if ((r[0]+lut[dt(r)][i].second < h) && (r[1]-lut[dt(r)][i].first >= 0)) + { + if (!dt(r+dpoint2d(lut[dt(r)][i].second, -lut[dt(r)][i].first))) + EP.insert(r+dpoint2d(lut[dt(r)][i].second, -lut[dt(r)][i].first)); + } + if ((r[0]-lut[dt(r)][i].second >= 0) && (r[1]+lut[dt(r)][i].first < w)) + { + if (!dt(r+dpoint2d(-lut[dt(r)][i].second, lut[dt(r)][i].first))) + EP.insert(r+dpoint2d(-lut[dt(r)][i].second, lut[dt(r)][i].first)); + } + } + } + } + + return EP; + } + + std::vector< std::vector<std::pair< int, int> > > Lut2d(int N) + { + int n = int(sqrt(N))+1; + int i=0; + std::vector< std::vector<std::pair< int, int> > > lut; + + for(i = 0; i <= N; i++) + { + std::vector<std::pair< int, int> > vect; + lut.push_back(vect); + } + + for(int x = 0; x <= n; x++) + { + for(int y = 0; y <= x; y++) + { + i=x*x+y*y; + if(i<=N) + { + std::pair<int,int> p(x,y); + lut[i].push_back(p); + } + } + } + + return lut; +} + + image2d<value::int_u8> DiscreteBisector(image2d<value::int_u8> dt, p_set<point2d> Y, const neighb2d& nbh, int N) + { + int w = geom::ncols(dt); + int h = geom::nrows(dt); + + int ux,uy,vx,vy, produit, angle, max; + double cos, normu, normv; + + std::vector< std::vector<std::pair< int, int> > > lut; + lut = Lut2d(N); + + p_set<point2d> proj; + + image2d<value::int_u8> bisector(h, w); + level::fill(bisector, 0); + + for (uint i=0; i<Y.nsites(); i++) + { + proj = EP(dt, Y[i], lut, nbh); + + int n=proj.nsites(); + + if (n>1) + { + max = 0; + for (int y=0; y<n; y++) + { + for (int z=0; z<y; z++) + { + ux = proj[y][0]-Y[i][0]; + uy = proj[y][1]-Y[i][1]; + vx = proj[z][0]-Y[i][0]; + vy = proj[z][1]-Y[i][1]; + + produit = ux * vx + uy * vy; + + normu = sqrt(ux*ux + uy*uy); + normv = sqrt(vx*vx + vy*vy); + + cos = produit/(normu*normv); + angle = int(acos(cos)*180.0/3.1415); + + max = math::max(max, angle); + } + } + bisector(Y[i]) = max; + } + + } + + return bisector; + + } + + + +const neighb2d& max_neighborhood(const Neighborhood<neighb2d>& nbh) +{ + return c8(); +} +template <typename N> + p_set<mln_psite(N)> ultimateSkeleton(p_set<mln_psite(N)> X, p_set<mln_psite(N)> X_complement, image2d<value::int_u8> dt, p_set<mln_psite(N)> Y, const Neighborhood<N>& nbh_, bool local) +{ + std::vector< std::pair< double, mln::point2d> > Q; + + N nbh = exact(nbh_); + // fill Q + for(uint i = 0; i < X.nsites(); i++) + { + if (!Y.has(X[i])) + { + std::pair<double, mln_psite(N)> p(dt(X[i]),X[i]); + Q = insertDicho(Q,p); + } + } + + + while(!Q.empty()) + { + mln_psite(N) tmp = Q[0].second; + + Q = remove(Q, tmp); + + if(simple_point(X, nbh, X_complement, tmp, local)) + { + X.remove(tmp); + X_complement.insert(tmp); + mln_niter(N) r(nbh, tmp); + for_all(r) + { + if(!Y.has(r) && X.has(r)) + { + std::pair<double, mln_psite(N)> p(dt(r),r); + Q = insertDicho(Q, p); + } + } + } + + } + return X; +} + + image2d<value::int_u8> intImage(image2d<bool> pic) +{ + int w = geom::ncols(pic); + int h = geom::nrows(pic); + + image2d<value::int_u8> out(h,w); + for(int i=0; i<w; i++) + for(int j=0; j<h; j++) + { + if(pic.at(j,i)) + out.at(j,i) = 1; + else + out.at(j,i) = 0; + } + return out; +} + image2d<bool> filteredSkeleton(image2d<bool> pic, const neighb2d& nbh, uint r, uint alpha, bool local) + { + using value::int_u8; + + typedef image2d<bool> I; + typedef p_set<point2d> S; + + image2d<value::int_u8> pic1 = intImage(pic); + image2d<value::int_u8> dt = sedt(pic1); + + mln::io::pgm::save(dt, "dt.pgm"); + + int w = geom::ncols(pic); + int h = geom::nrows(pic); + int l= math::min(w, h); + uint rmax = getRMax(dt); + uint rknown = 0; + p_set<point2d> X,Y,Z; + p_set<point2d> X_complement, Z_complement; + + image2d<value::int_u8> DTg(l,l,0); + std::vector< std::vector<int> > Mgl; + std::vector< std::vector<int> > Lut; + + Mgl = CompLutMask (DTg,Mgl,Lut,l,0,rmax); + + rknown =rmax; + + mln_fwd_piter_(image2d<bool>) p(pic.domain()); + + for_all(p) + { + if (pic(p)==1) + { + X.insert(p); + } + else + { + X_complement.insert(p); + } + } + std::cout << " medial axis " << std::endl; + pic = MA(pic, Mgl, dt, Lut); + + mln::io::pbm::save(pic, "ma.pbm"); + + for_all(p) + { + if (pic(p)==1) + { + Y.insert(p); + } + } + + std::cout << " euclidean skeleton " << std::endl; + Z = euclideanSkeleton(X, X_complement, dt, Y, nbh, local); + + sub_image<I, S> es = pic | Z; + I es1(pic.domain()); + level::fill(es1, false); + + level::paste(es, es1); + + mln::io::pbm::save(es1, "euclidean.pbm"); + + for_all(p) + { + if (!Z.has(p)) + { + Z_complement.insert(p); + } + } + std::cout << " discrete bisector " << std::endl; + pic1 = DiscreteBisector(dt, Y, nbh, rmax); + + + mln::io::pgm::save(pic1, "bisector.pgm"); + + uint cpt=0; + while (cpt!=Y.nsites()) + { + if (dt(Y[cpt])>=r && pic1(Y[cpt])>=alpha) + { + cpt++; + } + else + { + Y.remove(Y[cpt]); + } + } + + + sub_image<I, S> skel = pic | Y; + I test(pic.domain()); + level::fill(test, false); + + level::paste(skel, test); + + mln::io::pbm::save(test, "Y.pbm"); + + std::cout << " ultimate skeleton " << std::endl; + Z = ultimateSkeleton(Z, Z_complement, dt, Y, nbh, local); + + + + sub_image<I, S> skeleton = pic | Z; + I output(pic.domain()); + level::fill(output, false); + + level::paste(skeleton, output); + + return output; + } + +} // End of namespace mln +#endif // ! SKELETON_HH Index: branches/cleanup-2008/milena/sandbox/garrigues/ocr/skeleton.cc =================================================================== --- branches/cleanup-2008/milena/sandbox/garrigues/ocr/skeleton.cc (revision 0) +++ branches/cleanup-2008/milena/sandbox/garrigues/ocr/skeleton.cc (revision 2670) @@ -0,0 +1,30 @@ + +#include <mln/core/alias/point2d.hh> +#include "skeleton.hh" +#include <mln/level/paste.hh> +#include <mln/level/fill.hh> +#include <mln/core/image/sub_image.hh> +#include <mln/io/pgm/save.hh> +#include <mln/io/pbm/save.hh> +#include <mln/io/pbm/load.hh> + + +int main(int argc, char* argv[]) +{ + if(argc!=5) + { + std::cout << "arguments: filename voisinage R alpha" << std::endl; + exit(1); + } + image2d<bool> output; + std::string filename = argv[1]; + int r = atoi(argv[3]); + int alpha = atoi(argv[4]); + + image2d<bool> pic = io::pbm::load(filename); + if(atoi(argv[2])==4) + output = filteredSkeleton( pic, c4(), r, alpha, true); + else + output = filteredSkeleton( pic, c8(), r, alpha, true); + mln::io::pbm::save(output, "FS-"+std::string(argv[2])+"_"+std::string(argv[3])+"_"+std::string(argv[4])+"_"+filename); +}