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 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_polygon_xld_arc_info is reentrant and processed without parallelization.

hom_mat2d_invert, affine_trans_polygon_xld

read_world_file, write_polygon_xld_arc_info, read_contour_xld_arc_info

Sub-pixel operators