523 lines
18 KiB
C++
523 lines
18 KiB
C++
/****************************************************************************
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* VCGLib o o *
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* Visual and Computer Graphics Library o o *
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* _ O _ *
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* Copyright(C) 2004-2016 \/)\/ *
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* Visual Computing Lab /\/| *
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* ISTI - Italian National Research Council | *
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* \ *
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* All rights reserved. *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License (http://www.gnu.org/licenses/gpl.txt) *
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* for more details. *
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* *
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****************************************************************************/
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/** class Shot
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Shot is made of two elements:
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* the Instrinsics paramaters, which are stored as a Camera type (see vcg/math/camera) and that
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determines how a point in the frame of the camera is projected in the 2D projection plane
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* the Extrinsics parameters, which are stored in the class Shot (type ReferenceFrame)
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and that describe viewpoint and view direction.
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Some important notes about the usage of this class:
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* The World coordinates system is assumed to be RIGHT-HANDED.
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* The Shot reference frame is assumed to be RIGHT-HANDED.
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* The associated Camera is assumed to point in the negative direction of the Z axis of the Shot coordinates system (reference frame).
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As a consequence, the Camera coordinates system is LEFT-HANDED.
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* The Extrinsics parameters are kept as a rotation matrix "rot" and a translation vector "tra"
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The translation matrix "tra" corresponds to the viewpoint of the Shot while the rotation matrix
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"rot" corresponds to the axis of the reference frame by row, i.e.
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rot[0][0|1|2] == X axis
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rot[1][0|1|2] == Y axis
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rot[2][0|1|2] == Z axis
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It follows that the matrix made with the upper left 3x3 equal to rot and the 4th colum equal to tra
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and (0,0,0,1) in the bottom row transform a point from world coordiantes to the reference frame
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of the shot.
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**/
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#ifndef __VCGLIB_SHOT
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#define __VCGLIB_SHOT
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#include <vcg/space/point2.h>
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#include <vcg/space/point3.h>
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#include <vcg/math/similarity.h>
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#include <vcg/math/camera.h>
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namespace vcg{
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template <class S, class RotationType = Matrix44<S> >
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class Shot {
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public:
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typedef Camera<S> CameraType;
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typedef S ScalarType;
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template <class ScalarType, class RotoType >
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class ReferenceFrame {
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friend class Shot<ScalarType, RotoType>;
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RotoType rot; // rotation
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Point3<S> tra; // viewpoint
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public:
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ReferenceFrame():rot(),tra(){}
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void SetIdentity(){ rot.SetIdentity(); tra = Point3<S>(0.0,0.0,0.0);}
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void SetTra(const Point3<S> & tr) {tra = tr;}
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void SetRot(const RotoType & rt) {rot = rt;}
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Point3<ScalarType> Tra() const { return tra;}
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RotoType Rot() const { return rot;}
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};
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Camera<S> Intrinsics; // the camera that made the shot
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ReferenceFrame<S,RotationType> Extrinsics; // the position and orientation of the camera
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Shot(const Camera<S> &i, const ReferenceFrame<S,RotationType> &e)
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:Intrinsics(),Extrinsics()
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{
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Intrinsics = i;
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Extrinsics = e;
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}
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Shot(const Camera<S> &c)
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:Intrinsics(),Extrinsics()
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{
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Intrinsics = c;
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Extrinsics.SetIdentity();
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}
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Shot()
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:Intrinsics(),Extrinsics()
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{
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Extrinsics.SetIdentity();
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}
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template <class Q>
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static inline Shot Construct( const Shot<Q> & b )
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{
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ReferenceFrame<S,RotationType> r;
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r.SetRot(Matrix44<S>::Construct(b.Extrinsics.Rot()));
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r.SetTra(Point3<S>::Construct(b.Extrinsics.Tra()));
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return Shot(Camera<S>::Construct(b.Intrinsics), r);
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}
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/// GET the i-th axis of the coordinate system of the camera
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vcg::Point3<S> Axis(const int & i)const;
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/// GET the viewdir
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const vcg::Point3<S> GetViewDir()const;
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/// GET the viewpoint
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const vcg::Point3<S> GetViewPoint()const;
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/// SET the viewpoint
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void SetViewPoint(const vcg::Point3<S> & viewpoint);
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/// GET fov from focal
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float GetFovFromFocal();
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/// look at (point+up)
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void LookAt(const vcg::Point3<S> & point,const vcg::Point3<S> & up);
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/// look at (opengl-like)
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void LookAt(const S & eye_x,const S & eye_y,const S & eye_z,
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const S & at_x,const S & at_y,const S & at_z,
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const S & up_x,const S & up_y,const S & up_z);
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/// look towards (dir+up)
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void LookTowards(const vcg::Point3<S> & z_dir,const vcg::Point3<S> & up);
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/* Sometimes the focal is given in pixels. In this case, this function can be used to convert it in millimiters
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* given the CCD width (in mm). This method should be moved in vcg::Camera().
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* Equivalent focal length is obtained by setting the ccd width to 35 mm.
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*/
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void ConvertFocalToMM(S ccdwidth);
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/* Sometimes the 3D World coordinates are known up to a scale factor. This method adjust the camera/shot parameters
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* to account for the re-scaling of the World. If the intrisic parameters are just reasonable values
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* the cameras need only a re-positioning.
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*/
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void RescalingWorld(S scalefactor, bool adjustIntrinsics);
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/// Given a pure roto-translation (4-by-4) modifies the reference frame accordingly.
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void ApplyRigidTransformation(const Matrix44<S> & M);
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/// Given a similarity transformation such that p' = s R p + T modifies the reference frame accordingly.
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void ApplySimilarity( Matrix44<S> M);
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/// Given a similarity transformation such that p' = s R p + T modifies the reference frame accordingly.
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void ApplySimilarity(const Similarity<S> & Sim);
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/// convert a 3d point from world to camera coordinates (do not confuse with the Shot reference frame)
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vcg::Point3<S> ConvertWorldToCameraCoordinates(const vcg::Point3<S> & p) const;
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/// convert a 3d point from camera (do not confuse with the Shot reference frame) to world coordinates
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vcg::Point3<S> ConvertCameraToWorldCoordinates(const vcg::Point3<S> & p) const;
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/* convert a 3d point from camera (do not confuse with the Shot reference frame) to world coordinates
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* it uses inverse instead of transpose for non-exactly-rigid rotation matrices (such as calculated by tsai and garcia)
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*/
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vcg::Point3<S> ConvertCameraToWorldCoordinates_Substitute(const vcg::Point3<S> & p) const;
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/// project a 3d point from world coordinates to 2d camera viewport (the value returned is in pixels)
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vcg::Point2<S> Project(const vcg::Point3<S> & p) const;
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/// inverse projection from 2d camera viewport (in pixels) to 3d world coordinates (it requires the original depth of the projected point)
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vcg::Point3<S> UnProject(const vcg::Point2<S> & p, const S & d) const;
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/* inverse projection from 2d camera viewport (in pixels) to 3d world coordinates (it requires the original depth of the projected point)
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* uses inverse instead of trranspose for non-exactly-rigid rotation matrices (such as calculated by tsai and garcia)
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*/
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vcg::Point3<S> UnProject_Substitute(const vcg::Point2<S> & p, const S & d) const;
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/// returns the distance of point p from camera plane (z depth), required for unprojection operation
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S Depth(const vcg::Point3<S> & p)const;
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// accessors
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public:
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/// Returns the (4-by-4) matrix M such that 3dpoint_in_world_coordinates = M * 3dpoint_in_local_coordinates
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Matrix44<S> GetExtrinsicsToWorldMatrix() const
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{
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Matrix44<S> rotM;
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Extrinsics.rot.ToMatrix(rotM);
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return Matrix44<S>().SetTranslate(Extrinsics.tra) * rotM.transpose();
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}
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/// Returns the (4-by-4) matrix M such that 3dpoint_in_local_coordinates = M * 3dpoint_in_world_coordinates
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Matrix44<S> GetWorldToExtrinsicsMatrix() const
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{
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Matrix44<S> rotM;
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Extrinsics.rot.ToMatrix(rotM);
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return rotM * Matrix44<S>().SetTranslate(-Extrinsics.tra) ;
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}
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/* multiply the current reference frame for the matrix passed
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note: it is up to the caller to check the the matrix passed is a pure rototraslation
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*/
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void MultMatrix( vcg::Matrix44<S> m44)
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{
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Extrinsics.tra = m44 * Extrinsics.tra;
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m44[0][3] = m44[1][3] = m44[2][3] = 0.0; //set no translation
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const S k = m44.GetRow3(0).Norm(); //compute scaling (assumed uniform)
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Extrinsics.rot = Extrinsics.rot * m44.transpose() * (1/k);
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}
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/* multiply the current reference frame for the similarity passed
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note: it is up to the caller to check the the matrix passed is a pure rototraslation
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*/
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void MultSimilarity( const Similarity<S> & s){ MultMatrix(s.Matrix());}
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bool IsValid() const
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{
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return Intrinsics.PixelSizeMm[0]>0 && Intrinsics.PixelSizeMm[1]>0;
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}
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}; // end class definition
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template <class S, class RotationType>
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const vcg::Point3<S> Shot<S,RotationType>::GetViewDir() const
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{
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return Extrinsics.Rot().GetRow3(2);
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}
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//---
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/// GET the viewpoint
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template <class S, class RotationType>
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const vcg::Point3<S> Shot<S,RotationType>::GetViewPoint() const
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{
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return Extrinsics.tra;
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}
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/// SET the viewpoint
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template <class S, class RotationType>
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void Shot<S,RotationType>::SetViewPoint(const vcg::Point3<S> & viewpoint)
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{
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Extrinsics.SetTra( viewpoint );
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}
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//---
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/// GET fov from focal
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template <class S, class RotationType>
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float Shot<S,RotationType>::GetFovFromFocal()
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{
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double viewportYMm= Intrinsics.PixelSizeMm[1]* Intrinsics.ViewportPx[1];
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return 2*(vcg::math::ToDeg(atanf(viewportYMm/(2*Intrinsics.FocalMm))));
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}
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//---
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/// GET the i-th axis of the coordinate system of the camera
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template <class S, class RotationType>
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vcg::Point3<S> Shot<S,RotationType>::Axis(const int & i) const
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{
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vcg::Matrix44<S> m;
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Extrinsics.rot.ToMatrix(m);
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vcg::Point3<S> aa = m.GetRow3(i);
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return aa;
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}
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/// look at (point+up)
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template <class S, class RotationType>
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void Shot<S,RotationType>::LookAt(const vcg::Point3<S> & z_dir,const vcg::Point3<S> & up)
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{
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LookTowards(z_dir-GetViewPoint(),up);
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}
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/// look at (opengl-like)
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template <class S, class RotationType>
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void Shot<S,RotationType>::LookAt(const S & eye_x, const S & eye_y, const S & eye_z,
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const S & at_x, const S & at_y, const S & at_z,
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const S & up_x,const S & up_y,const S & up_z)
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{
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SetViewPoint(Point3<S>(eye_x,eye_y,eye_z));
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LookAt(Point3<S>(at_x,at_y,at_z),Point3<S>(up_x,up_y,up_z));
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}
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/// look towards
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template <class S, class RotationType>
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void Shot<S,RotationType>::LookTowards(const vcg::Point3<S> & z_dir,const vcg::Point3<S> & up)
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{
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vcg::Point3<S> x_dir = up ^-z_dir;
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vcg::Point3<S> y_dir = -z_dir ^x_dir;
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Matrix44<S> m;
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m.SetIdentity();
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*(vcg::Point3<S> *)&m[0][0] = x_dir/x_dir.Norm();
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*(vcg::Point3<S> *)&m[1][0] = y_dir/y_dir.Norm();
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*(vcg::Point3<S> *)&m[2][0] = -z_dir/z_dir.Norm();
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Extrinsics.rot.FromMatrix(m);
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}
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//--- Space transformation methods
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/// convert a 3d point from world to camera coordinates (do not confuse with the Shot reference frame)
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template <class S, class RotationType>
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vcg::Point3<S> Shot<S,RotationType>::ConvertWorldToCameraCoordinates(const vcg::Point3<S> & p) const
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{
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Matrix44<S> rotM;
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Extrinsics.rot.ToMatrix(rotM);
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vcg::Point3<S> cp = rotM * (p - GetViewPoint() );
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cp[2]=-cp[2];
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return cp;
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}
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/// convert a 3d point from camera coordinates (do not confuse with the Shot reference frame) to world coordinates
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template <class S, class RotationType>
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vcg::Point3<S> Shot<S,RotationType>::ConvertCameraToWorldCoordinates(const vcg::Point3<S> & p) const
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{
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Matrix44<S> rotM;
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vcg::Point3<S> cp = p;
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cp[2]=-cp[2];
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Extrinsics.rot.ToMatrix(rotM);
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cp = rotM.transpose() * cp + GetViewPoint();
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return cp;
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}
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/// convert a 3d point from camera to world coordinates, uses inverse instead of trranspose for non-exactly-rigid rotation matrices (such as calculated by tsai and garcia)
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template <class S, class RotationType>
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vcg::Point3<S> Shot<S,RotationType>::ConvertCameraToWorldCoordinates_Substitute(const vcg::Point3<S> & p) const
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{
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Matrix44<S> rotM;
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vcg::Point3<S> cp = p;
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cp[2]=-cp[2];
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Extrinsics.rot.ToMatrix(rotM);
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cp = Inverse(rotM) * cp + GetViewPoint();
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return cp;
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}
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/// project a 3d point from world coordinates to 2d camera viewport (the value returned is in pixel)
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template <class S, class RotationType>
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vcg::Point2<S> Shot<S,RotationType>::Project(const vcg::Point3<S> & p) const
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{
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Point3<S> cp = ConvertWorldToCameraCoordinates(p);
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Point2<S> pp = Intrinsics.Project(cp);
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Point2<S> vp = Intrinsics.LocalToViewportPx(pp);
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return vp;
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}
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/// inverse projection from 2d camera viewport (in pixels) to 3d world coordinates (it requires the original depth of the point to unproject)
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template <class S, class RotationType>
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vcg::Point3<S> Shot<S,RotationType>::UnProject(const vcg::Point2<S> & p, const S & d) const
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{
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Point2<S> lp = Intrinsics.ViewportPxToLocal(p);
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Point3<S> cp = Intrinsics.UnProject(lp,d);
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Point3<S> wp = ConvertCameraToWorldCoordinates(cp);
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return wp;
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}
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/* inverse projection from 2d camera viewport (in pixels) to 3d world coordinates (it requires the original depth of the projected point)
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* uses inverse instead of trranspose for non-exactly-rigid rotation matrices (such as calculated by tsai and garcia)
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*/
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template <class S, class RotationType>
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vcg::Point3<S> Shot<S,RotationType>::UnProject_Substitute(const vcg::Point2<S> & p, const S & d) const
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{
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Point2<S> lp = Intrinsics.ViewportPxToLocal(p);
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Point3<S> cp = Intrinsics.UnProject(lp,d);
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Point3<S> wp = ConvertCameraToWorldCoordinates_Substitute(cp);
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return wp;
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}
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/// returns the distance of point p from camera plane (z depth), required for unprojection operation
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template <class S, class RotationType>
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S Shot<S,RotationType>::Depth(const vcg::Point3<S> & p)const
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{
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return ConvertWorldToCameraCoordinates(p).Z();
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}
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/* Sometimes the focal is given in pixels. In this case, this function can be used to convert it in millimiters
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* given the CCD width (in mm). This method should be moved in vcg::Camera().
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* Equivalent focal length is obtained by setting the ccd width to 35 mm.
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*/
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template <class S, class RotationType>
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void Shot<S, RotationType>::ConvertFocalToMM(S ccdwidth)
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{
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double ccd_width = ccdwidth; // ccd is assumed conventionally to be 35mm
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double ccd_height = (ccd_width * Intrinsics.ViewportPx[1]) / Intrinsics.ViewportPx[0];
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Intrinsics.PixelSizeMm[0] = (ccd_width / Intrinsics.ViewportPx[0]);
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Intrinsics.PixelSizeMm[1] = (ccd_height / Intrinsics.ViewportPx[1]);
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Intrinsics.FocalMm = (ccd_width * Intrinsics.FocalMm) / Intrinsics.ViewportPx[0]; // NOW FOCAL IS IN MM
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}
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/* Sometimes the 3D World coordinates are known up to a scale factor. This method adjust the camera/shot parameters
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* to account for the re-scaling of the World. If the intrisic parameters are just reasonable values
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* the cameras need only a re-positioning.
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*/
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template <class S, class RotationType>
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void Shot<S, RotationType>::RescalingWorld(S scalefactor, bool adjustIntrinsics)
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{
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// adjust INTRINSICS (if required)
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if (adjustIntrinsics)
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{
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Intrinsics.FocalMm = Intrinsics.FocalMm * scalefactor;
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double ccdwidth = static_cast<double>(Intrinsics.ViewportPx[0] * Intrinsics.PixelSizeMm[0]);
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double ccdheight = static_cast<double>(Intrinsics.ViewportPx[1] * Intrinsics.PixelSizeMm[1]);
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Intrinsics.PixelSizeMm[0] = (ccdwidth * scalefactor) / Intrinsics.ViewportPx[0];
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Intrinsics.PixelSizeMm[1] = (ccdheight * scalefactor) / Intrinsics.ViewportPx[1];
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}
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// adjust EXTRINSICS
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// rotation remains the same (!)
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// nothing to do..
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// the viewpoint should be modified according to the scale factor
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Extrinsics.tra *= scalefactor;
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}
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/// Given a pure roto-translation matrix (4-by-4) modify the reference frame accordingly.
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template <class S, class RotationType>
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void Shot<S, RotationType>::ApplyRigidTransformation(const Matrix44<S> & M)
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{
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Matrix44<S> rotM;
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Extrinsics.rot.ToMatrix(rotM);
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// roto-translate the viewpoint
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Extrinsics.tra = M * Extrinsics.tra;
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Matrix44<S> newRot = rotM * M.transpose();
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newRot[3][0] = newRot[3][1] = newRot[3][2] = 0.0;
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Extrinsics.SetRot(newRot);
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}
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/// Given a similarity transformation modifies the reference frame accordingly.
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template <class S, class RotationType>
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void Shot<S, RotationType>::ApplySimilarity( Matrix44<S> M)
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{
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Matrix44<S> rotM;
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Extrinsics.rot.ToMatrix(rotM);
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// normalize
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M = M * (1/M.ElementAt(3,3));
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M[3][3] = 1; // just for numeric precision
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// compute scale factor
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ScalarType scalefactor = 1.0 / pow(ScalarType(M.Determinant()),1/ScalarType(3.0));
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// roto-translate the viewpoint
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Extrinsics.tra = M * Extrinsics.tra;
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vcg::Matrix44<S> M2 = M;
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M2 = M2 * scalefactor; // remove the scaling
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M2[3][3] = 1.0;
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M2[0][3] = M2[1][3] = M2[2][3] = 0; // remove the translation
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rotM = rotM * M2.transpose();
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Extrinsics.SetRot(rotM);
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}
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/// Given a similarity transformation modifies the reference frame accordingly.
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template <class S, class RotationType>
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void Shot<S, RotationType>::ApplySimilarity(const Similarity<S> & Sm)
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{
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Matrix44<S> rotM;
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Extrinsics.rot.ToMatrix(rotM);
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// similarity decomposition
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vcg::Matrix44<S> R;
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Sm.rot.ToMatrix(R);
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vcg::Matrix44<S> T;
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T.SetIdentity();
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T.ElementAt(0,3) = Sm.tra[0];
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T.ElementAt(1,3) = Sm.tra[1];
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T.ElementAt(2,3) = Sm.tra[2];
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vcg::Matrix44d S44;
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S44.SetIdentity();
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S44 *= Sm.sca;
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S44.ElementAt(3,3) = 1.0;
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vcg::Matrix44<S> M = T * R * S44;
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// roto-translate the viewpoint
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Extrinsics.tra = M * Extrinsics.tra;
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vcg::Matrix44<S> M2 = M;
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M2 = M2 * (1.0 / Sm.sca);
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Extrinsics.rot = rotM * M2.transpose();
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Extrinsics.rot.ElementAt(3,0) = 0;
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Extrinsics.rot.ElementAt(3,1) = 0;
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Extrinsics.rot.ElementAt(3,2) = 0;
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Extrinsics.rot.ElementAt(3,3) = 1;
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}
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//--------------------------------
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//--- utility definitions
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typedef Shot<float> Shotf;
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typedef Shot<double> Shotd;
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//-----------------------
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} // end name space
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#endif
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