132 lines
3.0 KiB
C++
132 lines
3.0 KiB
C++
/**
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* @file Cal3_S2.h
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* @brief The most common 5DOF 3D->2D calibration
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* @author Frank Dellaert
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*/
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#pragma once
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#include <gtsam/base/Matrix.h>
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#include <gtsam/geometry/Point2.h>
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#include <math.h>
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namespace gtsam {
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/** The most common 5DOF 3D->2D calibration */
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class Cal3_S2: Testable<Cal3_S2> {
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private:
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double fx_, fy_, s_, u0_, v0_;
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public:
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/**
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* default calibration leaves coordinates unchanged
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*/
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Cal3_S2() :
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fx_(1), fy_(1), s_(0), u0_(0), v0_(0) {
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}
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/**
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* constructor from doubles
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*/
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Cal3_S2(double fx, double fy, double s, double u0, double v0) :
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fx_(fx), fy_(fy), s_(s), u0_(u0), v0_(v0) {
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}
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/**
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* Easy constructor, takes fov in degrees, asssumes zero skew, unit aspect
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* @param fov field of view in degrees
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* @param w image width
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* @param h image height
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*/
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Cal3_S2(double fov, int w, int h) :
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s_(0), u0_((double)w/2.0), v0_((double)h/2.0) {
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double a = fov*M_PI/360.0; // fov/2 in radians
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fx_=(double)w*tan(a);
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fy_=fx_;
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}
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void print(const std::string& s = "") const {
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gtsam::print(matrix(), s);
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}
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/**
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* Check if equal up to specified tolerance
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*/
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bool equals(const Cal3_S2& K, double tol = 10e-9) const;
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/**
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* load calibration from location (default name is calibration_info.txt)
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*/
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Cal3_S2(const std::string &path);
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/**
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* return the principal point
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*/
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Point2 principalPoint() const {
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return Point2(u0_,v0_);
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}
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/**
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* return vectorized form (column-wise)
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*/
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Vector vector() const {
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double r[] = { fx_, fy_, s_, u0_, v0_ };
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Vector v(5);
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copy(r, r + 5, v.begin());
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return v;
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}
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/**
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* return calibration matrix K
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*/
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Matrix matrix() const {
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return Matrix_(3, 3, fx_, s_, u0_, 0.0, fy_, v0_, 0.0, 0.0, 1.0);
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}
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/**
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* convert intrinsic coordinates xy to image coordinates uv
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* with optional derivatives
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*/
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Point2 uncalibrate(const Point2& p,
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boost::optional<Matrix&> H1 = boost::none,
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boost::optional<Matrix&> H2 = boost::none) const;
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/**
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* convert image coordinates uv to intrinsic coordinates xy
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*/
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Point2 calibrate(const Point2& p) const {
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const double u = p.x(), v = p.y();
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return Point2((1/fx_)*(u-u0_ - (s_/fy_)*(v-v0_)), (1/fy_)*(v-v0_));
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}
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/**
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* return DOF, dimensionality of tangent space
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*/
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inline size_t dim() const { return 5; }
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/**
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* Given 5-dim tangent vector, create new calibration
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*/
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inline Cal3_S2 expmap(const Vector& d) const {
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return Cal3_S2(fx_ + d(0), fy_ + d(1),
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s_ + d(2), u0_ + d(3), v0_ + d(4));
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}
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private:
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/** Serialization function */
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friend class boost::serialization::access;
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template<class Archive>
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void serialize(Archive & ar, const unsigned int version)
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{
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ar & BOOST_SERIALIZATION_NVP(fx_);
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ar & BOOST_SERIALIZATION_NVP(fy_);
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ar & BOOST_SERIALIZATION_NVP(s_);
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ar & BOOST_SERIALIZATION_NVP(u0_);
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ar & BOOST_SERIALIZATION_NVP(v0_);
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}
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};
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typedef boost::shared_ptr<Cal3_S2> shared_ptrK;
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}
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