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git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@860 d0cd1f9f-072b-0410-8dd7-cf729c803f20
176 lines
7.5 KiB
C
176 lines
7.5 KiB
C
/**********************************************************************
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* File: oldbasel.h (Formerly oldbl.h)
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* Description: A re-implementation of the old baseline algorithm.
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* Author: Ray Smith
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* Created: Wed Oct 6 09:41:48 BST 1993
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*
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* (C) Copyright 1993, Hewlett-Packard Ltd.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*
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**********************************************************************/
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#ifndef OLDBASEL_H
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#define OLDBASEL_H
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#include "params.h"
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#include "blobbox.h"
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extern BOOL_VAR_H (textord_really_old_xheight, FALSE,
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"Use original wiseowl xheight");
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extern BOOL_VAR_H (textord_oldbl_debug, FALSE,
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"Debug old baseline generation");
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extern BOOL_VAR_H (textord_debug_baselines, FALSE,
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"Debug baseline generation");
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extern BOOL_VAR_H (textord_oldbl_paradef, TRUE, "Use para default mechanism");
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extern BOOL_VAR_H (textord_oldbl_split_splines, TRUE,
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"Split stepped splines");
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extern BOOL_VAR_H (textord_oldbl_merge_parts, TRUE,
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"Merge suspect partitions");
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extern BOOL_VAR_H (oldbl_xhfix, FALSE,
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"Fix bug in modes threshold for xheights");
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extern INT_VAR_H (oldbl_holed_losscount, 10,
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"Max lost before fallback line used");
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extern double_VAR_H (oldbl_dot_error_size, 1.26, "Max aspect ratio of a dot");
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extern double_VAR_H (textord_oldbl_jumplimit, 0.15,
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"X fraction for new partition");
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int get_blob_coords( //get boxes
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TO_ROW *row, //row to use
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inT32 lineheight, //block level
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TBOX *blobcoords, //ouput boxes
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BOOL8 &holed_line, //lost a lot of blobs
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int &outcount //no of real blobs
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);
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void make_first_baseline ( //initial approximation
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TBOX blobcoords[], /*blob bounding boxes */
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int blobcount, /*no of blobcoords */
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int xcoords[], /*coords for spline */
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int ycoords[], /*approximator */
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QSPLINE * spline, /*initial spline */
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QSPLINE * baseline, /*output spline */
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float jumplimit /*guess half descenders */
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);
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void make_holed_baseline ( //initial approximation
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TBOX blobcoords[], /*blob bounding boxes */
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int blobcount, /*no of blobcoords */
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QSPLINE * spline, /*initial spline */
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QSPLINE * baseline, /*output spline */
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float gradient //of line
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);
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int partition_line ( //partition blobs
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TBOX blobcoords[], //bounding boxes
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int blobcount, /*no of blobs on row */
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int *numparts, /*number of partitions */
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char partids[], /*partition no of each blob */
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int partsizes[], /*no in each partition */
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QSPLINE * spline, /*curve to fit to */
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float jumplimit, /*allowed delta change */
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float ydiffs[] /*diff from spline */
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);
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void merge_oldbl_parts ( //partition blobs
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TBOX blobcoords[], //bounding boxes
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int blobcount, /*no of blobs on row */
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char partids[], /*partition no of each blob */
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int partsizes[], /*no in each partition */
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int biggestpart, //major partition
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float jumplimit /*allowed delta change */
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);
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int get_ydiffs ( //evaluate differences
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TBOX blobcoords[], //bounding boxes
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int blobcount, /*no of blobs */
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QSPLINE * spline, /*approximating spline */
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float ydiffs[] /*output */
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);
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int choose_partition ( //select partition
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register float diff, /*diff from spline */
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float partdiffs[], /*diff on all parts */
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int lastpart, /*last assigned partition */
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float jumplimit, /*new part threshold */
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float* drift,
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float* last_delta,
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int *partcount /*no of partitions */
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);
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int partition_coords ( //find relevant coords
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TBOX blobcoords[], //bounding boxes
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int blobcount, /*no of blobs in row */
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char partids[], /*partition no of each blob */
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int bestpart, /*best new partition */
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int xcoords[], /*points to work on */
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int ycoords[] /*points to work on */
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);
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int segment_spline ( //make xstarts
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TBOX blobcoords[], //boundign boxes
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int blobcount, /*no of blobs in row */
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int xcoords[], /*points to work on */
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int ycoords[], /*points to work on */
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int degree, int pointcount, /*no of points */
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int xstarts[] //result
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);
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BOOL8 split_stepped_spline ( //make xstarts
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QSPLINE * baseline, //current shot
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float jumplimit, //max step fuction
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int xcoords[], /*points to work on */
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int xstarts[], //result
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int &segments //no of segments
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);
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void insert_spline_point ( //get descenders
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int xstarts[], //starts to shuffle
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int segment, //insertion pt
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int coord1, //coords to add
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int coord2, int &segments //total segments
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);
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void find_lesser_parts ( //get descenders
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TO_ROW * row, //row to process
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TBOX blobcoords[], //bounding boxes
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int blobcount, /*no of blobs */
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char partids[], /*partition of each blob */
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int partsizes[], /*size of each part */
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int partcount, /*no of partitions */
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int bestpart /*biggest partition */
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);
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void old_first_xheight ( //the wiseowl way
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TO_ROW * row, /*current row */
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TBOX blobcoords[], /*blob bounding boxes */
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int initialheight, //initial guess
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int blobcount, /*blobs in blobcoords */
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QSPLINE * baseline, /*established */
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float jumplimit /*min ascender height */
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);
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void make_first_xheight ( //find xheight
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TO_ROW * row, /*current row */
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TBOX blobcoords[], /*blob bounding boxes */
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int lineheight, //initial guess
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int init_lineheight, //block level guess
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int blobcount, /*blobs in blobcoords */
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QSPLINE * baseline, /*established */
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float jumplimit /*min ascender height */
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);
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int *make_height_array ( //get array of heights
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TBOX blobcoords[], /*blob bounding boxes */
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int blobcount, /*blobs in blobcoords */
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QSPLINE * baseline /*established */
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);
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void find_top_modes ( //get modes
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STATS * stats, //stats to hack
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int statnum, //no of piles
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int modelist[], int modenum //no of modes to get
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);
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void pick_x_height(TO_ROW * row, //row to do
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int modelist[],
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int lefts[], int rights[],
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STATS * heightstat,
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int mode_threshold);
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#endif
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