HALCON 18.05 / HALCON Operator Reference / File / Misc
ClassesClasses | | Operators

read_world_fileT_read_world_fileReadWorldFileReadWorldFile (Operator)

Name

read_world_fileT_read_world_fileReadWorldFileReadWorldFile — Read the geo coding from an ARC/INFO world file.

Signature

read_world_file( : : FileName : WorldTransformation)

Herror T_read_world_file(const Htuple FileName, Htuple* WorldTransformation)

void ReadWorldFile(const HTuple& FileName, HTuple* WorldTransformation)

void HHomMat2D::ReadWorldFile(const HString& FileName)

void HHomMat2D::ReadWorldFile(const char* FileName)

static void HOperatorSet.ReadWorldFile(HTuple fileName, out HTuple worldTransformation)

void HHomMat2D.ReadWorldFile(string fileName)

Description

read_world_fileread_world_fileReadWorldFileReadWorldFileReadWorldFile reads a geocoding from an ARC/INFO world file with the file name FileNameFileNameFileNameFileNamefileName and returns it as a homogeneous 2D transformation matrix in WorldTransformationWorldTransformationWorldTransformationWorldTransformationworldTransformation. To find the file FileNameFileNameFileNameFileNamefileName, all directories contained in the HALCON system variable 'image_dir'"image_dir""image_dir""image_dir""image_dir" (usually this is the content of the environment variable HALCONIMAGES) are searched (see read_imageread_imageReadImageReadImageReadImage). This transformation matrix can be used to transform XLD contours to the world coordinate system before writing them with write_contour_xld_arc_infowrite_contour_xld_arc_infoWriteContourXldArcInfoWriteContourXldArcInfoWriteContourXldArcInfo. If the matrix WorldTransformationWorldTransformationWorldTransformationWorldTransformationworldTransformation is inverted by calling hom_mat2d_inverthom_mat2d_invertHomMat2dInvertHomMat2dInvertHomMat2dInvert, the resulting matrix can be used to transform contours that have been read with read_contour_xld_arc_inforead_contour_xld_arc_infoReadContourXldArcInfoReadContourXldArcInfoReadContourXldArcInfo to the image coordinate system.

Execution Information

Parameters

FileNameFileNameFileNameFileNamefileName (input_control)  filename.read → HTupleHTupleHtuple (string) (string) (HString) (char*)

Name of the ARC/INFO world file.

WorldTransformationWorldTransformationWorldTransformationWorldTransformationworldTransformation (output_control)  hom_mat2d → HHomMat2D, HTupleHTupleHtuple (real) (double) (double) (double)

Transformation matrix from image to world coordinates.

Result

If the parameters are correct and the world file could be read, the operator read_world_fileread_world_fileReadWorldFileReadWorldFileReadWorldFile returns the value 2 (H_MSG_TRUE). Otherwise an exception is raised.

Possible Successors

hom_mat2d_inverthom_mat2d_invertHomMat2dInvertHomMat2dInvertHomMat2dInvert, affine_trans_contour_xldaffine_trans_contour_xldAffineTransContourXldAffineTransContourXldAffineTransContourXld, affine_trans_polygon_xldaffine_trans_polygon_xldAffineTransPolygonXldAffineTransPolygonXldAffineTransPolygonXld

See also

write_contour_xld_arc_infowrite_contour_xld_arc_infoWriteContourXldArcInfoWriteContourXldArcInfoWriteContourXldArcInfo, read_contour_xld_arc_inforead_contour_xld_arc_infoReadContourXldArcInfoReadContourXldArcInfoReadContourXldArcInfo, write_polygon_xld_arc_infowrite_polygon_xld_arc_infoWritePolygonXldArcInfoWritePolygonXldArcInfoWritePolygonXldArcInfo, read_polygon_xld_arc_inforead_polygon_xld_arc_infoReadPolygonXldArcInfoReadPolygonXldArcInfoReadPolygonXldArcInfo

Module

Foundation

ClassesClasses | | Operators
HALCON Operator Reference 18.05 Copyright © 1996-2018 MVTec Software GmbH