read_polygon_xld_arc_info — Read XLD polygons from a file in ARC/INFO generate format.
read_polygon_xld_arc_info reads the lines stored in ARC/INFO generate format in the file FileName, and returns them as XLD polygons in Polygons. To find the file FileName, all directories contained in the HALCON system variable 'image_dir' (usually this is the content of the environment variable HALCONIMAGES) are searched (see read_image). The returned polygons are in world coordinates. They can be transformed to the image coordinate system with the operator affine_trans_polygon_xld. The necessary transformation matrix can be generated by using read_world_file to read the transformation matrix from image to world coordinates, and inverting this matrix by calling hom_mat2d_invert.
Read XLD polygons.
Name of the ARC/INFO file.
* Read the transformation and invert it read_world_file ('image.tfw', WorldTransformation) hom_mat2d_invert (WorldTransformation, ImageTransformation) * Read the image read_image (Image, 'image.tif') * Read the line data read_polygon_xld_arc_info (LinesWorld, 'lines.gen') * Transform the line data to image coordinates affine_trans_polygon_xld (LinesWorld, Lines, ImageTransformation)
If the parameters are correct and the file could be read, the operator read_polygon_xld_arc_info returns the value 2 (H_MSG_TRUE). Otherwise an exception is raised.
read_world_file, write_polygon_xld_arc_info, read_contour_xld_arc_info