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/* Copyright (c) 2012 Patrick Ruoff
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*/
#ifndef POINTTRACKER_H
#define POINTTRACKER_H
#include <opencv2/core/core.hpp>
#include <memory>
#include <vector>
#include "opentrack-compat/timer.hpp"
#include "ftnoir_tracker_pt_settings.h"
#include <QObject>
// ----------------------------------------------------------------------------
// Affine frame trafo
class Affine
{
public:
Affine() : R(cv::Matx33f::eye()), t(0,0,0) {}
Affine(const cv::Matx33f& R, const cv::Vec3f& t) : R(R),t(t) {}
cv::Matx33f R;
cv::Vec3f t;
};
inline Affine operator*(const Affine& X, const Affine& Y)
{
return Affine(X.R*Y.R, X.R*Y.t + X.t);
}
inline Affine operator*(const cv::Matx33f& X, const Affine& Y)
{
return Affine(X*Y.R, X*Y.t);
}
inline Affine operator*(const Affine& X, const cv::Matx33f& Y)
{
return Affine(X.R*Y, X.t);
}
inline cv::Vec3f operator*(const Affine& X, const cv::Vec3f& v)
{
return X.R*v + X.t;
}
// ----------------------------------------------------------------------------
// Describes a 3-point model
// nomenclature as in
// [Denis Oberkampf, Daniel F. DeMenthon, Larry S. Davis: "Iterative Pose Estimation Using Coplanar Feature Points"]
class PointModel
{
friend class PointTracker;
public:
static constexpr int N_POINTS = 3;
cv::Vec3f M01; // M01 in model frame
cv::Vec3f M02; // M02 in model frame
cv::Vec3f u; // unit vector perpendicular to M01,M02-plane
cv::Matx22f P;
PointModel(settings_pt& s)
{
set_model(s);
// calculate u
u = M01.cross(M02);
u /= norm(u);
// calculate projection matrix on M01,M02 plane
float s11 = M01.dot(M01);
float s12 = M01.dot(M02);
float s22 = M02.dot(M02);
P = 1.0/(s11*s22-s12*s12) * cv::Matx22f(s22, -s12, -s12, s11);
}
void set_model(settings_pt& s)
{
enum { Cap = 0, ClipRight = 1, ClipLeft = 2 };
switch (s.model_used)
{
default:
case Cap:
{
const double x = 60, y = 90, z = 95;
M01 = cv::Vec3f(-x, -y, z);
M02 = cv::Vec3f(x, -y, z);
break;
}
case ClipLeft:
case ClipRight:
{
const double a = 27, b = 43, c = 62, d = 74;
M01 = cv::Vec3f(0, b, -a);
M02 = cv::Vec3f(0, -c, -d);
break;
}
}
}
void get_d_order(const std::vector<cv::Vec2f>& points, int* d_order, cv::Vec2f d) const;
};
// ----------------------------------------------------------------------------
// Tracks a 3-point model
// implementing the POSIT algorithm for coplanar points as presented in
// [Denis Oberkampf, Daniel F. DeMenthon, Larry S. Davis: "Iterative Pose Estimation Using Coplanar Feature Points"]
class PointTracker
{
public:
PointTracker();
// track the pose using the set of normalized point coordinates (x pos in range -0.5:0.5)
// f : (focal length)/(sensor width)
// dt : time since last call
void track(const std::vector<cv::Vec2f>& projected_points, const PointModel& model, float f, bool dynamic_pose, int init_phase_timeout);
Affine pose() const { return X_CM; }
cv::Vec2f project(const cv::Vec3f& v_M, float f);
void reset(const Affine& pose)
{
X_CM = pose;
}
private:
// the points in model order
struct PointOrder
{
cv::Vec2f points[PointModel::N_POINTS];
PointOrder()
{
for (int i = 0; i < PointModel::N_POINTS; i++)
points[i] = cv::Vec2f(0, 0);
}
};
PointOrder find_correspondences(const std::vector<cv::Vec2f>& projected_points, const PointModel &model);
PointOrder find_correspondences_previous(const std::vector<cv::Vec2f>& points, const PointModel &model, float f);
int POSIT(const PointModel& point_model, const PointOrder& order, float focal_length); // The POSIT algorithm, returns the number of iterations
Affine X_CM; // trafo from model to camera
Timer t;
bool init_phase;
};
#endif //POINTTRACKER_H
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