/********************************************************************** * File: oldbasel.h (Formerly oldbl.h) * Description: A re-implementation of the old baseline algorithm. * Author: Ray Smith * Created: Wed Oct 6 09:41:48 BST 1993 * * (C) Copyright 1993, Hewlett-Packard Ltd. ** Licensed under the Apache License, Version 2.0 (the "License"); ** you may not use this file except in compliance with the License. ** You may obtain a copy of the License at ** http://www.apache.org/licenses/LICENSE-2.0 ** Unless required by applicable law or agreed to in writing, software ** distributed under the License is distributed on an "AS IS" BASIS, ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. ** See the License for the specific language governing permissions and ** limitations under the License. * **********************************************************************/ #ifndef OLDBASEL_H #define OLDBASEL_H #include "params.h" #include "blobbox.h" extern BOOL_VAR_H (textord_really_old_xheight, FALSE, "Use original wiseowl xheight"); extern BOOL_VAR_H (textord_oldbl_debug, FALSE, "Debug old baseline generation"); extern BOOL_VAR_H (textord_debug_baselines, FALSE, "Debug baseline generation"); extern BOOL_VAR_H (textord_oldbl_paradef, TRUE, "Use para default mechanism"); extern BOOL_VAR_H (textord_oldbl_split_splines, TRUE, "Split stepped splines"); extern BOOL_VAR_H (textord_oldbl_merge_parts, TRUE, "Merge suspect partitions"); extern BOOL_VAR_H (oldbl_xhfix, FALSE, "Fix bug in modes threshold for xheights"); extern INT_VAR_H (oldbl_holed_losscount, 10, "Max lost before fallback line used"); extern double_VAR_H (oldbl_dot_error_size, 1.26, "Max aspect ratio of a dot"); extern double_VAR_H (textord_oldbl_jumplimit, 0.15, "X fraction for new partition"); int get_blob_coords( //get boxes TO_ROW* row, //row to use int32_t lineheight, //block level TBOX* blobcoords, //ouput boxes bool& holed_line, //lost a lot of blobs int& outcount //no of real blobs ); void make_first_baseline ( //initial approximation TBOX blobcoords[], /*blob bounding boxes */ int blobcount, /*no of blobcoords */ int xcoords[], /*coords for spline */ int ycoords[], /*approximator */ QSPLINE * spline, /*initial spline */ QSPLINE * baseline, /*output spline */ float jumplimit /*guess half descenders */ ); void make_holed_baseline ( //initial approximation TBOX blobcoords[], /*blob bounding boxes */ int blobcount, /*no of blobcoords */ QSPLINE * spline, /*initial spline */ QSPLINE * baseline, /*output spline */ float gradient //of line ); int partition_line ( //partition blobs TBOX blobcoords[], //bounding boxes int blobcount, /*no of blobs on row */ int *numparts, /*number of partitions */ char partids[], /*partition no of each blob */ int partsizes[], /*no in each partition */ QSPLINE * spline, /*curve to fit to */ float jumplimit, /*allowed delta change */ float ydiffs[] /*diff from spline */ ); void merge_oldbl_parts ( //partition blobs TBOX blobcoords[], //bounding boxes int blobcount, /*no of blobs on row */ char partids[], /*partition no of each blob */ int partsizes[], /*no in each partition */ int biggestpart, //major partition float jumplimit /*allowed delta change */ ); int get_ydiffs ( //evaluate differences TBOX blobcoords[], //bounding boxes int blobcount, /*no of blobs */ QSPLINE * spline, /*approximating spline */ float ydiffs[] /*output */ ); int choose_partition ( //select partition float diff, /*diff from spline */ float partdiffs[], /*diff on all parts */ int lastpart, /*last assigned partition */ float jumplimit, /*new part threshold */ float* drift, float* last_delta, int *partcount /*no of partitions */ ); int partition_coords ( //find relevant coords TBOX blobcoords[], //bounding boxes int blobcount, /*no of blobs in row */ char partids[], /*partition no of each blob */ int bestpart, /*best new partition */ int xcoords[], /*points to work on */ int ycoords[] /*points to work on */ ); int segment_spline ( //make xstarts TBOX blobcoords[], //boundign boxes int blobcount, /*no of blobs in row */ int xcoords[], /*points to work on */ int ycoords[], /*points to work on */ int degree, int pointcount, /*no of points */ int xstarts[] //result ); bool split_stepped_spline( //make xstarts QSPLINE* baseline, //current shot float jumplimit, //max step fuction int* xcoords, /*points to work on */ int* xstarts, //result int& segments //no of segments ); void insert_spline_point ( //get descenders int xstarts[], //starts to shuffle int segment, //insertion pt int coord1, //coords to add int coord2, int &segments //total segments ); void find_lesser_parts ( //get descenders TO_ROW * row, //row to process TBOX blobcoords[], //bounding boxes int blobcount, /*no of blobs */ char partids[], /*partition of each blob */ int partsizes[], /*size of each part */ int partcount, /*no of partitions */ int bestpart /*biggest partition */ ); void old_first_xheight ( //the wiseowl way TO_ROW * row, /*current row */ TBOX blobcoords[], /*blob bounding boxes */ int initialheight, //initial guess int blobcount, /*blobs in blobcoords */ QSPLINE * baseline, /*established */ float jumplimit /*min ascender height */ ); void make_first_xheight ( //find xheight TO_ROW * row, /*current row */ TBOX blobcoords[], /*blob bounding boxes */ int lineheight, //initial guess int init_lineheight, //block level guess int blobcount, /*blobs in blobcoords */ QSPLINE * baseline, /*established */ float jumplimit /*min ascender height */ ); int *make_height_array ( //get array of heights TBOX blobcoords[], /*blob bounding boxes */ int blobcount, /*blobs in blobcoords */ QSPLINE * baseline /*established */ ); void find_top_modes ( //get modes STATS * stats, //stats to hack int statnum, //no of piles int modelist[], int modenum //no of modes to get ); void pick_x_height(TO_ROW * row, //row to do int modelist[], int lefts[], int rights[], STATS * heightstat, int mode_threshold); #endif