hom_mat3d_to_poseT_hom_mat3d_to_poseHomMat3dToPoseHomMat3dToPosehom_mat3d_to_pose (Operator)

Name

hom_mat3d_to_poseT_hom_mat3d_to_poseHomMat3dToPoseHomMat3dToPosehom_mat3d_to_pose — Convert a homogeneous transformation matrix into a 3D pose.

Signature

hom_mat3d_to_pose( : : HomMat3D : Pose)

Description

hom_mat3d_to_posehom_mat3d_to_poseHomMat3dToPoseHomMat3dToPosehom_mat3d_to_pose converts a homogeneous transformation matrix into the corresponding 3D pose with type code 0. For details about 3D poses and the corresponding transformation matrices please refer to create_posecreate_poseCreatePoseCreatePosecreate_pose.

A typical application of hom_mat3d_to_posehom_mat3d_to_poseHomMat3dToPoseHomMat3dToPosehom_mat3d_to_pose is that a 3D pose was converted into a homogeneous transformation matrix to further transform it, e.g., with hom_mat3d_rotatehom_mat3d_rotateHomMat3dRotateHomMat3dRotatehom_mat3d_rotate or hom_mat3d_translatehom_mat3d_translateHomMat3dTranslateHomMat3dTranslatehom_mat3d_translate, and now must be converted back into a pose to use it as input for operators like image_points_to_world_planeimage_points_to_world_planeImagePointsToWorldPlaneImagePointsToWorldPlaneimage_points_to_world_plane.

Attention

hom_mat3d_to_posehom_mat3d_to_poseHomMat3dToPoseHomMat3dToPosehom_mat3d_to_pose only supports rigid transformations in HomMat3DHomMat3DHomMat3DhomMat3Dhom_mat_3d. For non-rigid transformations, the operator attempts to return a pose that is close to HomMat3DHomMat3DHomMat3DhomMat3Dhom_mat_3d. If HomMat3DHomMat3DHomMat3DhomMat3Dhom_mat_3d deviates significantly from a rigid transformation, the generated pose may also deviate significantly from HomMat3DHomMat3DHomMat3DhomMat3Dhom_mat_3d.

Execution Information

Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Processed without parallelization.

Parameters

HomMat3DHomMat3DHomMat3DhomMat3Dhom_mat_3d (input_control) hom_mat3d → (real)

Homogeneous transformation matrix.

PosePosePoseposepose (output_control) pose → (real / integer)

Equivalent 3D pose.

Number of elements: 7

Example (HDevelop)

* Calibrate camera.
calibrate_cameras (CalibDataID,Error)
* Get reference pose (pose 2 of calibration object 0).
get_calib_data (CalibDataID, 'calib_obj_pose',\
                [0,2], 'pose', ObjInCameraPose)
*  Convert pose to homogeneous transformation matrix.
pose_to_hom_mat3d(ObjInCameraPose, cam_H_cal)
*  Rotate it 90 degrees around its y-axis to obtain a world coordinate system
*  whose y- and z-axis lie in the plane of the calibration plate while the
*  x-axis point 'upwards': cam_H_w = cam_H_cal * RotY(90).
hom_mat3d_identity(HomMat3DIdent)
hom_mat3d_rotate(HomMat3DIdent, rad(90), 'y', 0, 0, 0, \
                 HomMat3DRotateY)
hom_mat3d_compose(cam_H_cal, HomMat3DRotateY, cam_H_w)
* Convert transformed matrix back to pose.
hom_mat3d_to_pose (cam_H_w, Pose)

Result

hom_mat3d_to_posehom_mat3d_to_poseHomMat3dToPoseHomMat3dToPosehom_mat3d_to_pose returns 2 ( H_MSG_TRUE) if all parameter values are correct. If necessary, an exception is raised