projection_matrix.h

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#pragma once
 
#include <pcl/types.h>
#include <pcl/point_cloud.h> // for PointCloud
#include <Eigen/Core> // for Matrix, RowMajor, Matrix3f
 
/**
  * \file common/geometry.h
  * Defines some geometrical functions and utility functions
  * \ingroup common
  */
 
/*@{*/
namespace pcl
{
  /** \brief Estimates the projection matrix P = K * (R|-R*t) from organized point clouds, with
    *        K = [[fx, s, cx], [0, fy, cy], [0, 0, 1]]
    *        R = rotation matrix and
    *        t = translation vector  
    * 
    * \param[in] cloud input cloud. Must be organized and from a projective device. e.g. stereo or kinect, ...
    * \param[out] projection_matrix output projection matrix
    * \param[in] indices The indices to be used to determine the projection matrix 
    * \return the resudial error. A high residual indicates, that the point cloud was not from a projective device.
    */
  template<typename PointT> double
  estimateProjectionMatrix (typename pcl::PointCloud<PointT>::ConstPtr cloud, Eigen::Matrix<float, 3, 4, Eigen::RowMajor>& projection_matrix, const Indices& indices = {});
  
  /** \brief Determines the camera matrix from the given projection matrix.
    * \note This method does NOT use a RQ decomposition, but uses the fact that the left 3x3 matrix P' of P squared eliminates the rotational part.
    *       P' = K * R -> P' * P'^T = K * R * R^T * K = K * K^T
    * \param[in] projection_matrix
    * \param[out] camera_matrix
    */
  PCL_EXPORTS void
  getCameraMatrixFromProjectionMatrix (const Eigen::Matrix<float, 3, 4, Eigen::RowMajor>& projection_matrix, Eigen::Matrix3f& camera_matrix);  
}
 
#include <pcl/common/impl/projection_matrix.hpp>