Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/textord/strokewidth.h @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: strokewidth.h
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3 // Description: Subclass of BBGrid to find uniformity of strokewidth.
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4 // Author: Ray Smith
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5 //
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6 // (C) Copyright 2008, Google Inc.
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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 TESSERACT_TEXTORD_STROKEWIDTH_H_
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20 #define TESSERACT_TEXTORD_STROKEWIDTH_H_
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21
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22 #include "blobbox.h" // BlobNeighbourDir.
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23 #include "blobgrid.h" // Base class.
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24 #include "colpartitiongrid.h"
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25 #include "textlineprojection.h"
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27 class DENORM;
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28 class ScrollView;
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29 class TO_BLOCK;
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31 namespace tesseract {
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33 class ColPartition_LIST;
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34 class TabFind;
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35 class TextlineProjection;
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37 // Misc enums to clarify bool arguments for direction-controlling args.
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38 enum LeftOrRight { LR_LEFT, LR_RIGHT };
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40 // Return value from FindInitialPartitions indicates detection of severe
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41 // skew or noise.
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42 enum PartitionFindResult {
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43 PFR_OK, // Everything is OK.
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44 PFR_SKEW, // Skew was detected and rotated.
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45 PFR_NOISE // Noise was detected and removed.
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46 };
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48 /**
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49 * The StrokeWidth class holds all the normal and large blobs.
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50 * It is used to find good large blobs and move them to the normal blobs
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51 * by virtue of having a reasonable strokewidth compatible neighbour.
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52 */
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53 class StrokeWidth : public BlobGrid {
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54 public:
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55 StrokeWidth(int gridsize, const ICOORD &bleft, const ICOORD &tright);
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56 ~StrokeWidth() override;
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57
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58 // Sets the neighbours member of the medium-sized blobs in the block.
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59 // Searches on 4 sides of each blob for similar-sized, similar-strokewidth
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60 // blobs and sets pointers to the good neighbours.
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61 void SetNeighboursOnMediumBlobs(TO_BLOCK *block);
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62
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63 // Sets the neighbour/textline writing direction members of the medium
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64 // and large blobs with optional repair of broken CJK characters first.
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65 // Repair of broken CJK is needed here because broken CJK characters
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66 // can fool the textline direction detection algorithm.
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67 void FindTextlineDirectionAndFixBrokenCJK(PageSegMode pageseg_mode, bool cjk_merge,
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68 TO_BLOCK *input_block);
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69
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70 // To save computation, the process of generating partitions is broken
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71 // into the following 4 steps:
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72 // TestVerticalTextDirection
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73 // CorrectForRotation (used only if a rotation is to be applied)
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74 // FindLeaderPartitions
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75 // GradeBlobsIntoPartitions.
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76 // These functions are all required, in sequence, except for
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77 // CorrectForRotation, which is not needed if no rotation is applied.
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78
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79 // Types all the blobs as vertical or horizontal text or unknown and
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80 // returns true if the majority are vertical.
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81 // If the blobs are rotated, it is necessary to call CorrectForRotation
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82 // after rotating everything, otherwise the work done here will be enough.
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83 // If osd_blobs is not null, a list of blobs from the dominant textline
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84 // direction are returned for use in orientation and script detection.
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85 // find_vertical_text_ratio should be textord_tabfind_vertical_text_ratio.
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86 bool TestVerticalTextDirection(double find_vertical_text_ratio, TO_BLOCK *block,
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87 BLOBNBOX_CLIST *osd_blobs);
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88
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89 // Corrects the data structures for the given rotation.
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90 void CorrectForRotation(const FCOORD &rerotation, ColPartitionGrid *part_grid);
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91
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92 // Finds leader partitions and inserts them into the given grid.
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93 void FindLeaderPartitions(TO_BLOCK *block, ColPartitionGrid *part_grid);
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94
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95 // Finds and marks noise those blobs that look like bits of vertical lines
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96 // that would otherwise screw up layout analysis.
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97 void RemoveLineResidue(ColPartition_LIST *big_part_list);
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98
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parents:
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99 // Types all the blobs as vertical text or horizontal text or unknown and
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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100 // puts them into initial ColPartitions in the supplied part_grid.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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101 // rerotation determines how to get back to the image coordinates from the
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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102 // blob coordinates (since they may have been rotated for vertical text).
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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103 // block is the single block for the whole page or rectangle to be OCRed.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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104 // nontext_pix (full-size), is a binary mask used to prevent merges across
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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105 // photo/text boundaries. It is not kept beyond this function.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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106 // denorm provides a mapping back to the image from the current blob
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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107 // coordinate space.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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108 // projection provides a measure of textline density over the image and
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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109 // provides functions to assist with diacritic detection. It should be a
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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110 // pointer to a new TextlineProjection, and will be setup here.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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111 // part_grid is the output grid of textline partitions.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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112 // Large blobs that cause overlap are put in separate partitions and added
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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113 // to the big_parts list.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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114 void GradeBlobsIntoPartitions(PageSegMode pageseg_mode, const FCOORD &rerotation, TO_BLOCK *block,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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115 Image nontext_pix, const DENORM *denorm, bool cjk_script,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
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116 TextlineProjection *projection, BLOBNBOX_LIST *diacritic_blobs,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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117 ColPartitionGrid *part_grid, ColPartition_LIST *big_parts);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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118
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119 // Handles a click event in a display window.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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120 void HandleClick(int x, int y) override;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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121
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parents:
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122 private:
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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123 // Computes the noise_density_ by summing the number of elements in a
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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124 // neighbourhood of each grid cell.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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125 void ComputeNoiseDensity(TO_BLOCK *block, TabFind *line_grid);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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126
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parents:
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127 // Detects and marks leader dots/dashes.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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128 // Leaders are horizontal chains of small or noise blobs that look
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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129 // monospace according to ColPartition::MarkAsLeaderIfMonospaced().
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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130 // Detected leaders become the only occupants of the block->small_blobs list.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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131 // Non-leader small blobs get moved to the blobs list.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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132 // Non-leader noise blobs remain singletons in the noise list.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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133 // All small and noise blobs in high density regions are marked BTFT_NONTEXT.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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134 // block is the single block for the whole page or rectangle to be OCRed.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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135 // leader_parts is the output.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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136 void FindLeadersAndMarkNoise(TO_BLOCK *block, ColPartition_LIST *leader_parts);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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137
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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138 /** Inserts the block blobs (normal and large) into this grid.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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139 * Blobs remain owned by the block. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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140 void InsertBlobs(TO_BLOCK *block);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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141
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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142 // Fix broken CJK characters, using the fake joined blobs mechanism.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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143 // Blobs are really merged, ie the master takes all the outlines and the
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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144 // others are deleted.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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145 // Returns true if sufficient blobs are merged that it may be worth running
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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146 // again, due to a better estimate of character size.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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147 bool FixBrokenCJK(TO_BLOCK *block);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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148
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parents:
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149 // Collect blobs that overlap or are within max_dist of the input bbox.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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150 // Return them in the list of blobs and expand the bbox to be the union
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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151 // of all the boxes. not_this is excluded from the search, as are blobs
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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152 // that cause the merged box to exceed max_size in either dimension.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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153 void AccumulateOverlaps(const BLOBNBOX *not_this, bool debug, int max_size, int max_dist,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
154 TBOX *bbox, BLOBNBOX_CLIST *blobs);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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155
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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156 // For each blob in this grid, Finds the textline direction to be horizontal
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
157 // or vertical according to distance to neighbours and 1st and 2nd order
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
158 // neighbours. Non-text tends to end up without a definite direction.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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159 // Result is setting of the neighbours and vert_possible/horz_possible
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 // flags in the BLOBNBOXes currently in this grid.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 // This function is called more than once if page orientation is uncertain,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162 // so display_if_debugging is true on the final call to display the results.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
163 void FindTextlineFlowDirection(PageSegMode pageseg_mode, bool display_if_debugging);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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164
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parents:
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165 // Sets the neighbours and good_stroke_neighbours members of the blob by
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
166 // searching close on all 4 sides.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 // When finding leader dots/dashes, there is a slightly different rule for
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168 // what makes a good neighbour.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
169 // If activate_line_trap, then line-like objects are found and isolated.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
170 void SetNeighbours(bool leaders, bool activate_line_trap, BLOBNBOX *blob);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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171
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parents:
diff changeset
172 // Sets the good_stroke_neighbours member of the blob if it has a
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 // GoodNeighbour on the given side.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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174 // Also sets the neighbour in the blob, whether or not a good one is found.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 // Return value is the number of neighbours in the line trap size range.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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176 // Leaders get extra special lenient treatment.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 int FindGoodNeighbour(BlobNeighbourDir dir, bool leaders, BLOBNBOX *blob);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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178
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parents:
diff changeset
179 // Makes the blob to be only horizontal or vertical where evidence
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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180 // is clear based on gaps of 2nd order neighbours.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 void SetNeighbourFlows(BLOBNBOX *blob);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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182
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parents:
diff changeset
183 // Nullify the neighbours in the wrong directions where the direction
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 // is clear-cut based on a distance margin. Good for isolating vertical
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 // text from neighbouring horizontal text.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 void SimplifyObviousNeighbours(BLOBNBOX *blob);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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187
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parents:
diff changeset
188 // Smoothes the vertical/horizontal type of the blob based on the
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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189 // 2nd-order neighbours. If reset_all is true, then all blobs are
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 // changed. Otherwise, only ambiguous blobs are processed.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 void SmoothNeighbourTypes(PageSegMode pageseg_mode, bool desperate, BLOBNBOX *blob);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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192
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parents:
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193 // Checks the left or right side of the given leader partition and sets the
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 // (opposite) leader_on_right or leader_on_left flags for blobs
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parents:
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195 // that are next to the given side of the given leader partition.
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parents:
diff changeset
196 void MarkLeaderNeighbours(const ColPartition *part, LeftOrRight side);
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197
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198 // Partition creation. Accumulates vertical and horizontal text chains,
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parents:
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199 // puts the remaining blobs in as unknowns, and then merges/splits to
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
200 // minimize overlap and smoothes the types with neighbours and the color
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parents:
diff changeset
201 // image if provided. rerotation is used to rotate the coordinate space
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parents:
diff changeset
202 // back to the nontext_map_ image.
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203 // If find_problems is true, detects possible noise pollution by the amount
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parents:
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204 // of partition overlap that is created by the diacritics. If excessive, the
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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205 // noise is separated out into diacritic blobs, and PFR_NOISE is returned.
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parents:
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206 // [TODO(rays): if the partition overlap is caused by heavy skew, deskews
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207 // the components, saves the skew_angle and returns PFR_SKEW.] If the return
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208 // is not PFR_OK, the job is incomplete, and FindInitialPartitions must be
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
209 // called again after cleaning up the partly done work.
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
210 PartitionFindResult FindInitialPartitions(PageSegMode pageseg_mode, const FCOORD &rerotation,
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
211 bool find_problems, TO_BLOCK *block,
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212 BLOBNBOX_LIST *diacritic_blobs,
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213 ColPartitionGrid *part_grid,
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diff changeset
214 ColPartition_LIST *big_parts, FCOORD *skew_angle);
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215 // Detects noise by a significant increase in partition overlap from
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parents:
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216 // pre_overlap to now, and removes noise from the union of all the overlapping
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217 // partitions, placing the blobs in diacritic_blobs. Returns true if any noise
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218 // was found and removed.
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219 bool DetectAndRemoveNoise(int pre_overlap, const TBOX &grid_box, TO_BLOCK *block,
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220 ColPartitionGrid *part_grid, BLOBNBOX_LIST *diacritic_blobs);
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parents:
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221 // Finds vertical chains of text-like blobs and puts them in ColPartitions.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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222 void FindVerticalTextChains(ColPartitionGrid *part_grid);
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parents:
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223 // Finds horizontal chains of text-like blobs and puts them in ColPartitions.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
224 void FindHorizontalTextChains(ColPartitionGrid *part_grid);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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225 // Finds diacritics and saves their base character in the blob.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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226 void TestDiacritics(ColPartitionGrid *part_grid, TO_BLOCK *block);
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227 // Searches this grid for an appropriately close and sized neighbour of the
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parents:
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228 // given [small] blob. If such a blob is found, the diacritic base is saved
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229 // in the blob and true is returned.
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230 // The small_grid is a secondary grid that contains the small/noise objects
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parents:
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231 // that are not in this grid, but may be useful for determining a connection
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parents:
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232 // between blob and its potential base character. (See DiacriticXGapFilled.)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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233 bool DiacriticBlob(BlobGrid *small_grid, BLOBNBOX *blob);
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parents:
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234 // Returns true if there is no gap between the base char and the diacritic
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parents:
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235 // bigger than a fraction of the height of the base char:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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236 // Eg: line end.....'
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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237 // The quote is a long way from the end of the line, yet it needs to be a
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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238 // diacritic. To determine that the quote is not part of an image, or
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parents:
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239 // a different text block, we check for other marks in the gap between
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parents:
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240 // the base char and the diacritic.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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241 // '<--Diacritic
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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242 // |---------|
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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243 // | |<-toobig-gap->
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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244 // | Base |<ok gap>
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
245 // |---------| x<-----Dot occupying gap
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parents:
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246 // The grid is const really.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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247 bool DiacriticXGapFilled(BlobGrid *grid, const TBOX &diacritic_box, const TBOX &base_box);
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parents:
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248 // Merges diacritics with the ColPartition of the base character blob.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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249 void MergeDiacritics(TO_BLOCK *block, ColPartitionGrid *part_grid);
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parents:
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250 // Any blobs on the large_blobs list of block that are still unowned by a
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
251 // ColPartition, are probably drop-cap or vertically touching so the blobs
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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252 // are removed to the big_parts list and treated separately.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
253 void RemoveLargeUnusedBlobs(TO_BLOCK *block, ColPartitionGrid *part_grid,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
254 ColPartition_LIST *big_parts);
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parents:
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255
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parents:
diff changeset
256 // All remaining unused blobs are put in individual ColPartitions.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
257 void PartitionRemainingBlobs(PageSegMode pageseg_mode, ColPartitionGrid *part_grid);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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258
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259 // If combine, put all blobs in the cell_list into a single partition,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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260 // otherwise put each one into its own partition.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
261 void MakePartitionsFromCellList(PageSegMode pageseg_mode, bool combine,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
262 ColPartitionGrid *part_grid, BLOBNBOX_CLIST *cell_list);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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263
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parents:
diff changeset
264 // Helper function to finish setting up a ColPartition and insert into
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
265 // part_grid.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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266 void CompletePartition(PageSegMode pageseg_mode, ColPartition *part, ColPartitionGrid *part_grid);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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267
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parents:
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268 // Helper returns true if we are looking only for vertical textlines,
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parents:
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269 // taking into account any rotation that has been done.
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parents:
diff changeset
270 bool FindingVerticalOnly(PageSegMode pageseg_mode) const {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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271 if (rerotation_.y() == 0.0f) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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272 return pageseg_mode == PSM_SINGLE_BLOCK_VERT_TEXT;
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273 }
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274 return !PSM_ORIENTATION_ENABLED(pageseg_mode) && pageseg_mode != PSM_SINGLE_BLOCK_VERT_TEXT;
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parents:
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275 }
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parents:
diff changeset
276 // Helper returns true if we are looking only for horizontal textlines,
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parents:
diff changeset
277 // taking into account any rotation that has been done.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
278 bool FindingHorizontalOnly(PageSegMode pageseg_mode) const {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
279 if (rerotation_.y() == 0.0f) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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280 return !PSM_ORIENTATION_ENABLED(pageseg_mode) && pageseg_mode != PSM_SINGLE_BLOCK_VERT_TEXT;
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281 }
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parents:
diff changeset
282 return pageseg_mode == PSM_SINGLE_BLOCK_VERT_TEXT;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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283 }
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parents:
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284
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parents:
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285 // Merge partitions where the merge appears harmless.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
286 void EasyMerges(ColPartitionGrid *part_grid);
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parents:
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287
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parents:
diff changeset
288 // Compute a search box based on the orientation of the partition.
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289 // Returns true if a suitable box can be calculated.
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290 // Callback for EasyMerges.
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291 bool OrientationSearchBox(ColPartition *part, TBOX *box);
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292
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293 // Merge confirmation callback for EasyMerges.
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294 bool ConfirmEasyMerge(const ColPartition *p1, const ColPartition *p2);
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295
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296 // Returns true if there is no significant noise in between the boxes.
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297 bool NoNoiseInBetween(const TBOX &box1, const TBOX &box2) const;
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298
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299 #ifndef GRAPHICS_DISABLED
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300 // Displays the blobs colored according to the number of good neighbours
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301 // and the vertical/horizontal flow.
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302 ScrollView *DisplayGoodBlobs(const char *window_name, int x, int y);
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303
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304 // Displays blobs colored according to whether or not they are diacritics.
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305 ScrollView *DisplayDiacritics(const char *window_name, int x, int y, TO_BLOCK *block);
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306 #endif
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307
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308 private:
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309 // Image map of photo/noise areas on the page. Borrowed pointer (not owned.)
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310 Image nontext_map_;
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311 // Textline projection map. Borrowed pointer.
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312 TextlineProjection *projection_;
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313 // DENORM used by projection_ to get back to image coords. Borrowed pointer.
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314 const DENORM *denorm_;
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315 // Bounding box of the grid.
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316 TBOX grid_box_;
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317 // Rerotation to get back to the original image.
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318 FCOORD rerotation_;
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319 #ifndef GRAPHICS_DISABLED
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320 // Windows for debug display.
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321 ScrollView *leaders_win_ = nullptr;
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322 ScrollView *initial_widths_win_ = nullptr;
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323 ScrollView *widths_win_ = nullptr;
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324 ScrollView *chains_win_ = nullptr;
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325 ScrollView *diacritics_win_ = nullptr;
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326 ScrollView *textlines_win_ = nullptr;
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327 ScrollView *smoothed_win_ = nullptr;
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328 #endif
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329 };
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330
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331 } // namespace tesseract.
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332
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333 #endif // TESSERACT_TEXTORD_STROKEWIDTH_H_