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#ifndef __OPENCV_STITCHING_MOTION_ESTIMATORS_HPP__
#define __OPENCV_STITCHING_MOTION_ESTIMATORS_HPP__
#include "opencv2/core/core.hpp"
#include "matchers.hpp"
#include "util.hpp"
#include "camera.hpp"
namespace cv {
namespace detail {
class CV_EXPORTS Estimator
{
public:
virtual ~Estimator() {}
void operator ()(const std::vector<ImageFeatures> &features, const std::vector<MatchesInfo> &pairwise_matches,
std::vector<CameraParams> &cameras)
{ estimate(features, pairwise_matches, cameras); }
protected:
virtual void estimate(const std::vector<ImageFeatures> &features, const std::vector<MatchesInfo> &pairwise_matches,
std::vector<CameraParams> &cameras) = 0;
};
class CV_EXPORTS HomographyBasedEstimator : public Estimator
{
public:
HomographyBasedEstimator(bool is_focals_estimated = false)
: is_focals_estimated_(is_focals_estimated) {}
private:
void estimate(const std::vector<ImageFeatures> &features, const std::vector<MatchesInfo> &pairwise_matches,
std::vector<CameraParams> &cameras);
bool is_focals_estimated_;
};
class CV_EXPORTS BundleAdjusterBase : public Estimator
{
public:
const Mat refinementMask() const { return refinement_mask_.clone(); }
void setRefinementMask(const Mat &mask)
{
CV_Assert(mask.type() == CV_8U && mask.size() == Size(3, 3));
refinement_mask_ = mask.clone();
}
double confThresh() const { return conf_thresh_; }
void setConfThresh(double conf_thresh) { conf_thresh_ = conf_thresh; }
CvTermCriteria termCriteria() { return term_criteria_; }
void setTermCriteria(const CvTermCriteria& term_criteria) { term_criteria_ = term_criteria; }
protected:
BundleAdjusterBase(int num_params_per_cam, int num_errs_per_measurement)
: num_params_per_cam_(num_params_per_cam),
num_errs_per_measurement_(num_errs_per_measurement)
{
setRefinementMask(Mat::ones(3, 3, CV_8U));
setConfThresh(1.);
setTermCriteria(cvTermCriteria(CV_TERMCRIT_EPS + CV_TERMCRIT_ITER, 1000, DBL_EPSILON));
}
// Runs bundle adjustment
virtual void estimate(const std::vector<ImageFeatures> &features,
const std::vector<MatchesInfo> &pairwise_matches,
std::vector<CameraParams> &cameras);
virtual void setUpInitialCameraParams(const std::vector<CameraParams> &cameras) = 0;
virtual void obtainRefinedCameraParams(std::vector<CameraParams> &cameras) const = 0;
virtual void calcError(Mat &err) = 0;
virtual void calcJacobian(Mat &jac) = 0;
// 3x3 8U mask, where 0 means don't refine respective parameter, != 0 means refine
Mat refinement_mask_;
int num_images_;
int total_num_matches_;
int num_params_per_cam_;
int num_errs_per_measurement_;
const ImageFeatures *features_;
const MatchesInfo *pairwise_matches_;
// Threshold to filter out poorly matched image pairs
double conf_thresh_;
//Levenberg–Marquardt algorithm termination criteria
CvTermCriteria term_criteria_;
// Camera parameters matrix (CV_64F)
Mat cam_params_;
// Connected images pairs
std::vector<std::pair<int,int> > edges_;
};
// Minimizes reprojection error.
// It can estimate focal length, aspect ratio, principal point.
// You can affect only on them via the refinement mask.
class CV_EXPORTS BundleAdjusterReproj : public BundleAdjusterBase
{
public:
BundleAdjusterReproj() : BundleAdjusterBase(7, 2) {}
private:
void setUpInitialCameraParams(const std::vector<CameraParams> &cameras);
void obtainRefinedCameraParams(std::vector<CameraParams> &cameras) const;
void calcError(Mat &err);
void calcJacobian(Mat &jac);
Mat err1_, err2_;
};
// Minimizes sun of ray-to-ray distances.
// It can estimate focal length. It ignores the refinement mask for now.
class CV_EXPORTS BundleAdjusterRay : public BundleAdjusterBase
{
public:
BundleAdjusterRay() : BundleAdjusterBase(4, 3) {}
private:
void setUpInitialCameraParams(const std::vector<CameraParams> &cameras);
void obtainRefinedCameraParams(std::vector<CameraParams> &cameras) const;
void calcError(Mat &err);
void calcJacobian(Mat &jac);
Mat err1_, err2_;
};
enum WaveCorrectKind
{
WAVE_CORRECT_HORIZ,
WAVE_CORRECT_VERT
};
void CV_EXPORTS waveCorrect(std::vector<Mat> &rmats, WaveCorrectKind kind);
//////////////////////////////////////////////////////////////////////////////
// Auxiliary functions
// Returns matches graph representation in DOT language
std::string CV_EXPORTS matchesGraphAsString(std::vector<std::string> &pathes, std::vector<MatchesInfo> &pairwise_matches,
float conf_threshold);
std::vector<int> CV_EXPORTS leaveBiggestComponent(std::vector<ImageFeatures> &features, std::vector<MatchesInfo> &pairwise_matches,
float conf_threshold);
void CV_EXPORTS findMaxSpanningTree(int num_images, const std::vector<MatchesInfo> &pairwise_matches,
Graph &span_tree, std::vector<int> ¢ers);
} // namespace detail
} // namespace cv
#endif // __OPENCV_STITCHING_MOTION_ESTIMATORS_HPP__
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