rolling shutter projection factor
yotams
parent
301f7fe1a3
commit
d4eaa15280
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@ -319,11 +319,30 @@ T expm(const Vector& x, int K=7) {
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}
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/**
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* Linear interpolation between X and Y by coefficient t in [0, 1].
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* Linear interpolation and some extrapolation between X and Y by coefficient t in [0, 1.5], optinal jacobians calculations.
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*/
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template <typename T>
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T interpolate(const T& X, const T& Y, double t) {
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assert(t >= 0 && t <= 1);
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template <typename T, int N>
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T interpolate(const T& X, const T& Y, double t, OptionalJacobian<N, N> Hx = boost::none, OptionalJacobian<N, N> Hy = boost::none) {
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assert(t >= 0 && t <= 1.5);
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if (Hx && Hy) {
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typedef Eigen::Matrix<double, N, N> Jacobian;
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typename traits<T>::TangentVector tres;
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T tres1;
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Jacobian d1;
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Jacobian d2;
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tres1 = traits<T>::Between(X, Y, Hx, Hy);
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tres = traits<T>::Logmap(tres1, d1);
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*Hx = d1 * (*Hx);
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*Hy = d1 * (*Hy);
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tres1 = traits<T>::Expmap(t * tres, d1);
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*Hx = t * d1 * (*Hx);
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*Hy = t * d1 * (*Hy);
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tres1 = traits<T>::Compose(X, tres1, d1, d2);
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*Hx = d1 + d2 * (*Hx);
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*Hy = d2 * (*Hy);
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return tres1;
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}
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return traits<T>::Compose(X, traits<T>::Expmap(t * traits<T>::Logmap(traits<T>::Between(X, Y))));
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}
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@ -423,4 +423,8 @@ std::ostream &operator<<(std::ostream &os, const Pose3& pose) {
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return os;
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}
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Pose3 pose3_interp(const Pose3& X, const Pose3& Y, double t, Matrix& Hx, Matrix& Hy) {
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return X.interp(t, Y, Hx, Hy);
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}
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} // namespace gtsam
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@ -353,6 +353,15 @@ public:
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return std::make_pair(0, 2);
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}
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/**
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* @brief Spherical Linear interpolation between *this and other
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* @param s a value between 0 and 1.5
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* @param other final point of iterpolation geodesic on manifold
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* @param Hx jacobian of the interpolation on this
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& @param Hy jacobian of the interpolation on other
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*/
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Pose3 interp(double t, const Pose3& other, OptionalJacobian<6, 6> Hx = boost::none, OptionalJacobian<6, 6> Hy = boost::none) const;
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/// Output stream operator
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GTSAM_EXPORT
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friend std::ostream &operator<<(std::ostream &os, const Pose3& p);
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@ -0,0 +1,214 @@
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/* ----------------------------------------------------------------------------
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* GTSAM Copyright 2010, Georgia Tech Research Corporation,
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* Atlanta, Georgia 30332-0415
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* All Rights Reserved
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* Authors: Frank Dellaert, et al. (see THANKS for the full author list)
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* See LICENSE for the license information
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* -------------------------------------------------------------------------- */
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/**
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* @file RollingShutterProjectionFactor.h
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* @brief Basic bearing factor from 2D measurement for rolling shutter cameras
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* @author Yotam Stern
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*/
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#pragma once
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#include <gtsam/nonlinear/NonlinearFactor.h>
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#include <gtsam/geometry/SimpleCamera.h>
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#include <boost/optional.hpp>
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namespace gtsam {
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/**
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* Non-linear factor for a constraint derived from a 2D measurement. The calibration is known here.
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* i.e. the main building block for visual SLAM.
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* this version takes rolling shutter information into account like so: consider camera A (pose A) and camera B, and Point2 from camera A.
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* camera A has timestamp t_A for the exposure time of its first row, and so does camera B t_B, Point2 has timestamp t_p according to the timestamp
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* corresponding to the time of exposure of the row in the camera it belongs to.
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* let us define the interp_param = (t_p - t_A) / (t_B - t_A), we will use the pose interpolated between A and B by the interp_param to project
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* the corresponding landmark to Point2.
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* @addtogroup SLAM
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*/
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class RollingShutterProjectionFactor: public NoiseModelFactor3<Pose3, Pose3, Point3> {
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protected:
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// Keep a copy of measurement and calibration for I/O
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Point2 measured_; ///< 2D measurement
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double interp_param_; ///< interpolation parameter corresponding to the point2 measured
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boost::shared_ptr<Cal3_S2> K_; ///< shared pointer to calibration object
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boost::optional<Pose3> body_P_sensor_; ///< The pose of the sensor in the body frame
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// verbosity handling for Cheirality Exceptions
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bool throwCheirality_; ///< If true, rethrows Cheirality exceptions (default: false)
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bool verboseCheirality_; ///< If true, prints text for Cheirality exceptions (default: false)
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public:
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/// shorthand for base class type
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typedef NoiseModelFactor3<Pose3, Pose3, Point3> Base;
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/// shorthand for this class
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typedef RollingShutterProjectionFactor This;
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/// shorthand for a smart pointer to a factor
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typedef boost::shared_ptr<This> shared_ptr;
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/// Default constructor
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RollingShutterProjectionFactor() :
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measured_(0, 0), interp_param_(0), throwCheirality_(false), verboseCheirality_(false) {
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}
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/**
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* Constructor
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* @param measured is the 2 dimensional location of point in image (the measurement)
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* @param interp_param is the rolling shutter parameter for the measurement
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* @param model is the standard deviation
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* @param poseKey_a is the index of the first camera
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* @param poseKey_b is the index of the second camera
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* @param pointKey is the index of the landmark
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* @param K shared pointer to the constant calibration
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* @param body_P_sensor is the transform from body to sensor frame (default identity)
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*/
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RollingShutterProjectionFactor(const Point2& measured, double interp_param, const SharedNoiseModel& model,
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Key poseKey_a, Key poseKey_b, Key pointKey, const boost::shared_ptr<Cal3_S2>& K,
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boost::optional<Pose3> body_P_sensor = boost::none) :
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Base(model, poseKey_a, poseKey_b, pointKey), measured_(measured), interp_param_(interp_param), K_(K), body_P_sensor_(body_P_sensor),
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throwCheirality_(false), verboseCheirality_(false) {}
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/**
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* Constructor with exception-handling flags
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* @param measured is the 2 dimensional location of point in image (the measurement)
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* @param interp_param is the rolling shutter parameter for the measurement
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* @param model is the standard deviation
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* @param poseKey_a is the index of the first camera
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* @param poseKey_b is the index of the second camera
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* @param pointKey is the index of the landmark
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* @param K shared pointer to the constant calibration
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* @param throwCheirality determines whether Cheirality exceptions are rethrown
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* @param verboseCheirality determines whether exceptions are printed for Cheirality
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* @param body_P_sensor is the transform from body to sensor frame (default identity)
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*/
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RollingShutterProjectionFactor(const Point2& measured, double interp_param, const SharedNoiseModel& model,
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Key poseKey_a, Key poseKey_b, Key pointKey, const boost::shared_ptr<Cal3_S2>& K,
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bool throwCheirality, bool verboseCheirality,
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boost::optional<Pose3> body_P_sensor = boost::none) :
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Base(model, poseKey_a, poseKey_b, pointKey), measured_(measured), interp_param_(interp_param), K_(K), body_P_sensor_(body_P_sensor),
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throwCheirality_(throwCheirality), verboseCheirality_(verboseCheirality) {}
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/** Virtual destructor */
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virtual ~RollingShutterProjectionFactor() {}
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/// @return a deep copy of this factor
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virtual gtsam::NonlinearFactor::shared_ptr clone() const {
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return boost::static_pointer_cast<gtsam::NonlinearFactor>(
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gtsam::NonlinearFactor::shared_ptr(new This(*this))); }
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/**
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* print
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* @param s optional string naming the factor
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* @param keyFormatter optional formatter useful for printing Symbols
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*/
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void print(const std::string& s = "", const KeyFormatter& keyFormatter = DefaultKeyFormatter) const {
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std::cout << s << "RollingShutterProjectionFactor, z = ";
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traits<Point2>::Print(measured_);
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std::cout << " rolling shutter interpolation param = " << interp_param_;
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if(this->body_P_sensor_)
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this->body_P_sensor_->print(" sensor pose in body frame: ");
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Base::print("", keyFormatter);
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}
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/// equals
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virtual bool equals(const NonlinearFactor& p, double tol = 1e-9) const {
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const This *e = dynamic_cast<const This*>(&p);
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return e
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&& Base::equals(p, tol)
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&& (interp_param_ == e->interp_param())
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&& traits<Point2>::Equals(this->measured_, e->measured_, tol)
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&& this->K_->equals(*e->K_, tol)
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&& ((!body_P_sensor_ && !e->body_P_sensor_) || (body_P_sensor_ && e->body_P_sensor_ && body_P_sensor_->equals(*e->body_P_sensor_)));
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}
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/// Evaluate error h(x)-z and optionally derivatives
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Vector evaluateError(const Pose3& pose_a, const Pose3& pose_b, const Point3& point,
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boost::optional<Matrix&> H1 = boost::none, boost::optional<Matrix&> H2 = boost::none, boost::optional<Matrix&> H3 = boost::none) const {
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Pose3 pose;
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gtsam::Matrix Hprj;
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//pose = interpolate(pose_a, pose_b, interp_param_, H1, H2);
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pose = pose_a.interp(interp_param_, pose_b, H1, H2);
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try {
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if(body_P_sensor_) {
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if(H1 && H2) {
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gtsam::Matrix H0;
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PinholeCamera<Cal3_S2> camera(pose.compose(*body_P_sensor_, H0), *K_);
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Point2 reprojectionError(camera.project(point, Hprj, H3, boost::none) - measured_);
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*H1 = Hprj * H0 * (*H1);
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*H2 = Hprj * H0 * (*H2);
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return reprojectionError;
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} else {
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PinholeCamera<Cal3_S2> camera(pose.compose(*body_P_sensor_), *K_);
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return camera.project(point, Hprj, H3, boost::none) - measured_;
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}
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} else {
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PinholeCamera<Cal3_S2> camera(pose, *K_);
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Point2 reprojectionError(camera.project(point, Hprj, H3, boost::none) - measured_);
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if (H1) *H1 = Hprj * (*H1);
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if (H2) *H2 = Hprj * (*H2);
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return reprojectionError;
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}
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} catch( CheiralityException& e) {
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if (H1) *H1 = Matrix::Zero(2,6);
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if (H2) *H2 = Matrix::Zero(2,6);
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if (H3) *H3 = Matrix::Zero(2,3);
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if (verboseCheirality_)
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std::cout << e.what() << ": Landmark "<< DefaultKeyFormatter(this->key2()) <<
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" moved behind camera " << DefaultKeyFormatter(this->key1()) << std::endl;
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if (throwCheirality_)
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throw CheiralityException(this->key2());
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}
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return Vector2::Constant(2.0 * K_->fx());
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}
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/** return the measurement */
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const Point2& measured() const {
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return measured_;
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}
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/** return the calibration object */
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inline const boost::shared_ptr<Cal3_S2> calibration() const {
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return K_;
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}
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/** returns the rolling shutter interp param*/
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inline double interp_param() const {return interp_param_; }
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/** return verbosity */
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inline bool verboseCheirality() const { return verboseCheirality_; }
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/** return flag for throwing cheirality exceptions */
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inline bool throwCheirality() const { return throwCheirality_; }
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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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ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(Base);
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ar & BOOST_SERIALIZATION_NVP(measured_);
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ar & BOOST_SERIALIZATION_NVP(interp_param_);
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ar & BOOST_SERIALIZATION_NVP(K_);
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ar & BOOST_SERIALIZATION_NVP(body_P_sensor_);
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ar & BOOST_SERIALIZATION_NVP(throwCheirality_);
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ar & BOOST_SERIALIZATION_NVP(verboseCheirality_);
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}
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public:
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EIGEN_MAKE_ALIGNED_OPERATOR_NEW
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}; // rolling shutter projection factor
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} //namespace gtsam
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