Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/textord/oldbasel.h @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 /**********************************************************************
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2 * File: oldbasel.h (Formerly oldbl.h)
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3 * Description: A re-implementation of the old baseline algorithm.
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4 * Author: Ray Smith
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5 *
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6 * (C) Copyright 1993, Hewlett-Packard Ltd.
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7 ** Licensed under the Apache License, Version 2.0 (the "License");
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8 ** you may not use this file except in compliance with the License.
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9 ** You may obtain a copy of the License at
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10 ** http://www.apache.org/licenses/LICENSE-2.0
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11 ** Unless required by applicable law or agreed to in writing, software
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12 ** distributed under the License is distributed on an "AS IS" BASIS,
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13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 ** See the License for the specific language governing permissions and
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15 ** limitations under the License.
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16 *
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17 **********************************************************************/
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19 #ifndef OLDBASEL_H
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20 #define OLDBASEL_H
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21
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22 #include "blobbox.h"
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23 #include "params.h"
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25 namespace tesseract {
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27 extern BOOL_VAR_H(textord_oldbl_debug);
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28
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29 int get_blob_coords( // get boxes
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30 TO_ROW *row, // row to use
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31 int32_t lineheight, // block level
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32 TBOX *blobcoords, // output boxes
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33 bool &holed_line, // lost a lot of blobs
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34 int &outcount // no of real blobs
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35 );
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36 void make_first_baseline( // initial approximation
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37 TBOX blobcoords[], /*blob bounding boxes */
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38 int blobcount, /*no of blobcoords */
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39 int xcoords[], /*coords for spline */
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40 int ycoords[], /*approximator */
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41 QSPLINE *spline, /*initial spline */
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42 QSPLINE *baseline, /*output spline */
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43 float jumplimit /*guess half descenders */
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44 );
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45 void make_holed_baseline( // initial approximation
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46 TBOX blobcoords[], /*blob bounding boxes */
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47 int blobcount, /*no of blobcoords */
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48 QSPLINE *spline, /*initial spline */
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49 QSPLINE *baseline, /*output spline */
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50 float gradient // of line
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51 );
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52 int partition_line( // partition blobs
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53 TBOX blobcoords[], // bounding boxes
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54 int blobcount, /*no of blobs on row */
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55 int *numparts, /*number of partitions */
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56 char partids[], /*partition no of each blob */
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57 int partsizes[], /*no in each partition */
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58 QSPLINE *spline, /*curve to fit to */
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59 float jumplimit, /*allowed delta change */
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60 float ydiffs[] /*diff from spline */
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61 );
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62 void merge_oldbl_parts( // partition blobs
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63 TBOX blobcoords[], // bounding boxes
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64 int blobcount, /*no of blobs on row */
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65 char partids[], /*partition no of each blob */
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66 int partsizes[], /*no in each partition */
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67 int biggestpart, // major partition
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68 float jumplimit /*allowed delta change */
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69 );
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70 int get_ydiffs( // evaluate differences
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71 TBOX blobcoords[], // bounding boxes
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72 int blobcount, /*no of blobs */
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73 QSPLINE *spline, /*approximating spline */
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74 float ydiffs[] /*output */
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75 );
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76 int choose_partition( // select partition
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77 float diff, /*diff from spline */
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78 float partdiffs[], /*diff on all parts */
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79 int lastpart, /*last assigned partition */
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80 float jumplimit, /*new part threshold */
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81 float *drift, float *last_delta, int *partcount /*no of partitions */
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82 );
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83 int partition_coords( // find relevant coords
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84 TBOX blobcoords[], // bounding boxes
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85 int blobcount, /*no of blobs in row */
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86 char partids[], /*partition no of each blob */
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87 int bestpart, /*best new partition */
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88 int xcoords[], /*points to work on */
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89 int ycoords[] /*points to work on */
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90 );
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91 int segment_spline( // make xstarts
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92 TBOX blobcoords[], // boundign boxes
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93 int blobcount, /*no of blobs in row */
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94 int xcoords[], /*points to work on */
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95 int ycoords[], /*points to work on */
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96 int degree, int pointcount, /*no of points */
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97 int xstarts[] // result
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98 );
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99 bool split_stepped_spline( // make xstarts
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100 QSPLINE *baseline, // current shot
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101 float jumplimit, // max step function
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102 int *xcoords, /*points to work on */
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103 int *xstarts, // result
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104 int &segments // no of segments
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105 );
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106 void insert_spline_point( // get descenders
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107 int xstarts[], // starts to shuffle
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108 int segment, // insertion pt
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109 int coord1, // coords to add
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110 int coord2, int &segments // total segments
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111 );
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112 void find_lesser_parts( // get descenders
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113 TO_ROW *row, // row to process
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114 TBOX blobcoords[], // bounding boxes
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115 int blobcount, /*no of blobs */
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116 char partids[], /*partition of each blob */
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117 int partsizes[], /*size of each part */
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118 int partcount, /*no of partitions */
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119 int bestpart /*biggest partition */
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120 );
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121
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122 void old_first_xheight( // the wiseowl way
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123 TO_ROW *row, /*current row */
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124 TBOX blobcoords[], /*blob bounding boxes */
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125 int initialheight, // initial guess
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126 int blobcount, /*blobs in blobcoords */
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127 QSPLINE *baseline, /*established */
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128 float jumplimit /*min ascender height */
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129 );
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130
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131 void make_first_xheight( // find xheight
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132 TO_ROW *row, /*current row */
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133 TBOX blobcoords[], /*blob bounding boxes */
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134 int lineheight, // initial guess
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135 int init_lineheight, // block level guess
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136 int blobcount, /*blobs in blobcoords */
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137 QSPLINE *baseline, /*established */
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138 float jumplimit /*min ascender height */
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139 );
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140
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141 int *make_height_array( // get array of heights
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142 TBOX blobcoords[], /*blob bounding boxes */
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143 int blobcount, /*blobs in blobcoords */
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144 QSPLINE *baseline /*established */
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145 );
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146
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147 void find_top_modes( // get modes
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148 STATS *stats, // stats to hack
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149 int statnum, // no of piles
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150 int modelist[], int modenum // no of modes to get
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151 );
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152
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153 void pick_x_height(TO_ROW *row, // row to do
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154 int modelist[], int lefts[], int rights[], STATS *heightstat,
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155 int mode_threshold);
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156
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157 } // namespace tesseract
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158
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159 #endif