Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/textord/colpartitiongrid.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: colpartitiongrid.h
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3 // Description: Class collecting code that acts on a BBGrid of ColPartitions.
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4 // Author: Ray Smith
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5 //
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6 // (C) Copyright 2009, 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_COLPARTITIONGRID_H_
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20 #define TESSERACT_TEXTORD_COLPARTITIONGRID_H_
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22 #include "bbgrid.h"
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23 #include "colpartition.h"
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24 #include "colpartitionset.h"
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26 namespace tesseract {
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28 class TabFind;
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30 // ColPartitionGrid is a BBGrid of ColPartition.
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31 // It collects functions that work on the grid.
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32 class TESS_API ColPartitionGrid
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33 : public BBGrid<ColPartition, ColPartition_CLIST, ColPartition_C_IT> {
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34 public:
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35 ColPartitionGrid() = default;
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36 ColPartitionGrid(int gridsize, const ICOORD &bleft, const ICOORD &tright);
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38 ~ColPartitionGrid() override = default;
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40 // Handles a click event in a display window.
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41 void HandleClick(int x, int y) override;
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43 // Merges ColPartitions in the grid that look like they belong in the same
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44 // textline.
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45 // For all partitions in the grid, calls the box_cb permanent callback
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46 // to compute the search box, searches the box, and if a candidate is found,
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47 // calls the confirm_cb to check any more rules. If the confirm_cb returns
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48 // true, then the partitions are merged.
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49 // Both callbacks are deleted before returning.
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50 void Merges(const std::function<bool(ColPartition *, TBOX *)> &box_cb,
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51 const std::function<bool(const ColPartition *,
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52 const ColPartition *)> &confirm_cb);
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54 // For the given partition, calls the box_cb permanent callback
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55 // to compute the search box, searches the box, and if a candidate is found,
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56 // calls the confirm_cb to check any more rules. If the confirm_cb returns
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57 // true, then the partitions are merged.
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58 // Returns true if the partition is consumed by one or more merges.
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59 bool MergePart(const std::function<bool(ColPartition *, TBOX *)> &box_cb,
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60 const std::function<bool(const ColPartition *,
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61 const ColPartition *)> &confirm_cb,
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62 ColPartition *part);
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64 // Computes and returns the total overlap of all partitions in the grid.
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65 // If overlap_grid is non-null, it is filled with a grid that holds empty
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66 // partitions representing the union of all overlapped partitions.
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67 int ComputeTotalOverlap(ColPartitionGrid **overlap_grid);
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68
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69 // Finds all the ColPartitions in the grid that overlap with the given
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70 // box and returns them SortByBoxLeft(ed) and uniqued in the given list.
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71 // Any partition equal to not_this (may be nullptr) is excluded.
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72 void FindOverlappingPartitions(const TBOX &box, const ColPartition *not_this,
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73 ColPartition_CLIST *parts);
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74
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75 // Finds and returns the best candidate ColPartition to merge with part,
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76 // selected from the candidates list, based on the minimum increase in
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77 // pairwise overlap among all the partitions overlapped by the combined box.
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78 // If overlap_increase is not nullptr then it returns the increase in overlap
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79 // that would result from the merge.
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80 // See colpartitiongrid.cpp for a diagram.
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81 ColPartition *BestMergeCandidate(
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82 const ColPartition *part, ColPartition_CLIST *candidates, bool debug,
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83 const std::function<bool(const ColPartition *, const ColPartition *)>
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84 &confirm_cb,
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85 int *overlap_increase);
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86
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87 // Split partitions where it reduces overlap between their bounding boxes.
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88 // ColPartitions are after all supposed to be a partitioning of the blobs
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89 // AND of the space on the page!
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90 // Blobs that cause overlaps get removed, put in individual partitions
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91 // and added to the big_parts list. They are most likely characters on
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92 // 2 textlines that touch, or something big like a dropcap.
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93 void SplitOverlappingPartitions(ColPartition_LIST *big_parts);
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94
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95 // Filters partitions of source_type by looking at local neighbours.
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96 // Where a majority of neighbours have a text type, the partitions are
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97 // changed to text, where the neighbours have image type, they are changed
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
98 // to image, and partitions that have no definite neighbourhood type 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
99 // left unchanged.
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
100 // im_box and rerotation are used to map blob coordinates onto 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
101 // nontext_map, which is used to prevent the spread of text neighbourhoods
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
102 // into images.
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
103 // Returns true if anything was changed.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
104 bool GridSmoothNeighbours(BlobTextFlowType source_type, Image nontext_map,
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
105 const TBOX &im_box, const FCOORD &rerotation);
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
106
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
107 // Reflects the grid and its colpartitions in the y-axis, assuming that
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
108 // all blob boxes have already 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
109 void ReflectInYAxis();
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
110
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
111 // Rotates the grid and its colpartitions by the given angle, assuming that
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
112 // all blob boxes have already 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
113 void Deskew(const FCOORD &deskew);
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
114
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
115 // Transforms the grid of partitions to the output blocks, putting each
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
116 // partition into a separate block. We don't really care about the 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
117 // as we just want to get as much text as possible without trying to organize
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
118 // it into proper blocks or columns.
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
119 void ExtractPartitionsAsBlocks(BLOCK_LIST *blocks, TO_BLOCK_LIST *to_blocks);
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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120
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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121 // Sets the left and right tabs of the partitions in the 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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122 void SetTabStops(TabFind *tabgrid);
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
123
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
124 // Makes the ColPartSets and puts them in the PartSetVector ready
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
125 // for finding column bounds. Returns false if no partitions were 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:
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126 // Each ColPartition in the grid is placed in a single ColPartSet based
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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127 // on the bottom-left of its bounding box.
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 bool MakeColPartSets(PartSetVector *part_sets);
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
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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130 // Makes a single ColPartitionSet consisting of a single ColPartition that
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
131 // represents the total horizontal extent of the significant content 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:
diff changeset
132 // page. Used for the single column setting in place of automatic detection.
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
133 // Returns nullptr if the page is empty of significant content.
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
134 ColPartitionSet *MakeSingleColumnSet(WidthCallback cb);
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
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
136 // Mark the BLOBNBOXes in each partition as being owned by that partition.
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
137 void ClaimBoxes();
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
138
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
139 // Retypes all the blobs referenced by the partitions in the 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
140 // Image blobs are sliced on the grid boundaries to give the tab finder
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
141 // a better handle on the edges of the images, and the actual 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
142 // returned in the im_blobs list, as they are not owned by the 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:
diff changeset
143 void ReTypeBlobs(BLOBNBOX_LIST *im_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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144
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
145 // The boxes within the partitions have changed (by deskew) so recompute
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
146 // the bounds of all the partitions and reinsert them into the 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
147 void RecomputeBounds(int gridsize, const ICOORD &bleft, const ICOORD &tright,
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
148 const ICOORD &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:
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149
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
150 // Improves the margins of the ColPartitions in the grid by calling
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
151 // FindPartitionMargins on each.
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
152 void GridFindMargins(ColPartitionSet **best_columns);
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
153
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
154 // Improves the margins of the ColPartitions in the list by calling
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
155 // FindPartitionMargins on each.
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
156 void ListFindMargins(ColPartitionSet **best_columns,
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 ColPartition_LIST *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:
diff changeset
158
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
159 // Deletes all the partitions in the grid after disowning all 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:
diff changeset
160 void DeleteParts();
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
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162 // Deletes all the partitions in the grid that are of type BRT_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:
diff changeset
163 // all the blobs in them.
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
164 void DeleteUnknownParts(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:
diff changeset
165
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
166 // Deletes all the partitions in the grid that are NOT of flow type
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 // BTFT_LEADER.
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 void DeleteNonLeaderParts();
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
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
170 // Finds and marks text partitions that represent figure captions.
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
171 void FindFigureCaptions();
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
172
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 //////// Functions that manipulate ColPartitions in the 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
174 //////// to find chains of partner partitions of the same type. ///////
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 // For every ColPartition in the grid, finds its upper and lower 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
176 void FindPartitionPartners();
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 // Finds the best partner in the given direction for the given partition.
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
178 // Stores the result with AddPartner.
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
179 void FindPartitionPartners(bool upper, ColPartition *part);
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
180 // Finds the best partner in the given direction for the given partition.
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 // Stores the result with AddPartner.
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
182 void FindVPartitionPartners(bool to_the_left, ColPartition *part);
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
183 // For every ColPartition with multiple partners in the grid, reduces 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
184 // number of partners to 0 or 1. If get_desperate is true, goes to more
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 // desperate merge methods to merge flowing text before breaking partnerships.
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 RefinePartitionPartners(bool get_desperate);
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
187
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 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:
diff changeset
189 // Finds and returns a list of candidate ColPartitions to merge with part.
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 // The candidates must overlap search_box, and when merged must not
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 // overlap any other partitions that are not overlapped by each individually.
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
192 void FindMergeCandidates(const ColPartition *part, const TBOX &search_box,
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
193 bool debug, ColPartition_CLIST *candidates);
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
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
195 // Smoothes the region type/flow type of the given part by looking at local
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196 // neighbours and the given image mask. Searches a padded rectangle with the
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197 // padding truncated on one size of the part's box in turn for each side,
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198 // using the result (if any) that has the least distance to all neighbours
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199 // that contribute to the decision. This biases in favor of rectangular
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200 // regions without completely enforcing them.
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201 // If a good decision cannot be reached, the part is left unchanged.
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202 // im_box and rerotation are used to map blob coordinates onto the
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203 // nontext_map, which is used to prevent the spread of text neighbourhoods
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204 // into images.
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205 // Returns true if the partition was changed.
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206 bool SmoothRegionType(Image nontext_map, const TBOX &im_box,
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207 const FCOORD &rerotation, bool debug,
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208 ColPartition *part);
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209 // Executes the search for SmoothRegionType in a single direction.
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210 // Creates a bounding box that is padded in all directions except direction,
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211 // and searches it for other partitions. Finds the nearest collection of
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212 // partitions that makes a decisive result (if any) and returns the type
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213 // and the distance of the collection. If there are any pixels in the
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214 // nontext_map, then the decision is biased towards image.
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215 BlobRegionType SmoothInOneDirection(BlobNeighbourDir direction,
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216 Image nontext_map, const TBOX &im_box,
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217 const FCOORD &rerotation, bool debug,
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218 const ColPartition &part,
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219 int *best_distance);
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220 // Counts the partitions in the given search_box by appending the gap
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221 // distance (scaled by dist_scaling) of the part from the base_part to the
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222 // vector of the appropriate type for the partition. Prior to return, the
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223 // vectors in the dists array are sorted in increasing order.
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224 // dists must be an array of vectors of size NPT_COUNT.
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225 void AccumulatePartDistances(const ColPartition &base_part,
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226 const ICOORD &dist_scaling,
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227 const TBOX &search_box, Image nontext_map,
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228 const TBOX &im_box, const FCOORD &rerotation,
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229 bool debug, std::vector<int> *dists);
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230
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231 // Improves the margins of the ColPartition by searching for
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232 // neighbours that vertically overlap significantly.
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233 void FindPartitionMargins(ColPartitionSet *columns, ColPartition *part);
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234
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235 // Starting at x, and going in the specified direction, up to x_limit, finds
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236 // the margin for the given y range by searching sideways,
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237 // and ignoring not_this.
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238 int FindMargin(int x, bool right_to_left, int x_limit, int y_bottom,
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239 int y_top, const ColPartition *not_this);
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240 };
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241
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242 } // namespace tesseract.
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243
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244 #endif // TESSERACT_TEXTORD_COLPARTITIONGRID_H_