Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/textord/alignedblob.h @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: alignedblob.h
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3 // Description: A class to find vertically aligned blobs in a BBGrid,
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4 // and a struct to hold control parameters.
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5 // Author: Ray Smith
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6 //
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7 // (C) Copyright 2008, Google Inc.
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8 // Licensed under the Apache License, Version 2.0 (the "License");
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9 // you may not use this file except in compliance with the License.
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10 // You may obtain a copy of the License at
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11 // http://www.apache.org/licenses/LICENSE-2.0
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12 // Unless required by applicable law or agreed to in writing, software
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13 // distributed under the License is distributed on an "AS IS" BASIS,
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14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 // See the License for the specific language governing permissions and
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16 // limitations under the License.
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17 //
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18 ///////////////////////////////////////////////////////////////////////
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20 #ifndef TESSERACT_TEXTORD_ALIGNEDBLOB_H_
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21 #define TESSERACT_TEXTORD_ALIGNEDBLOB_H_
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23 #include "bbgrid.h"
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24 #include "blobbox.h"
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25 #include "tabvector.h"
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27 namespace tesseract {
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29 extern INT_VAR_H(textord_debug_bugs);
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30 extern INT_VAR_H(textord_debug_tabfind);
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31 extern BOOL_VAR_H(textord_debug_printable);
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33 // Simple structure to hold the search parameters for AlignedBlob.
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34 // The members are mostly derived from constants, which are
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35 // conditioned on the alignment parameter.
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36 // For finding vertical lines, a different set of constants are
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37 // used, conditioned on the different constructor.
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38 struct AlignedBlobParams {
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39 // Constructor to set the parameters for finding aligned and ragged tabs.
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40 // Vertical_x and vertical_y are the current estimates of the true vertical
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41 // direction (up) in the image. Height is the height of the starter blob.
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42 // v_gap_multiple is the multiple of height that will be used as a limit
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43 // on vertical gap before giving up and calling the line ended.
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44 // resolution is the original image resolution, and align0 indicates the
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45 // type of tab stop to be found.
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46 AlignedBlobParams(int vertical_x, int vertical_y, int height, int v_gap_multiple,
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47 int min_gutter_width, int resolution, TabAlignment alignment0);
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48 // Constructor to set the parameters for finding vertical lines.
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49 // Vertical_x and vertical_y are the current estimates of the true vertical
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50 // direction (up) in the image. Width is the width of the starter blob.
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51 AlignedBlobParams(int vertical_x, int vertical_y, int width);
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52
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53 // Fit the vertical vector into an ICOORD, which is 16 bit.
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54 void set_vertical(int vertical_x, int vertical_y);
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56 double gutter_fraction; // Multiple of height used for min_gutter.
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57 bool right_tab; // We are looking at right edges.
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58 bool ragged; // We are looking for a ragged (vs aligned) edge.
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59 TabAlignment alignment; // The type we are trying to produce.
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60 TabType confirmed_type; // Type to flag blobs if accepted.
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61 int max_v_gap; // Max vertical gap to be tolerated.
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62 int min_gutter; // Minimum gutter between columns.
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63 // Tolerances allowed on horizontal alignment of aligned edges.
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64 int l_align_tolerance; // Left edges.
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65 int r_align_tolerance; // Right edges.
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66 // Conditions for accepting a line.
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67 int min_points; // Minimum number of points to be OK.
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68 int min_length; // Min length of completed line.
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69
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70 ICOORD vertical; // Current estimate of logical vertical.
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71 };
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73 // The AlignedBlob class contains code to find vertically aligned blobs.
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74 // This is factored out into a separate class, so it can be used by both
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75 // vertical line finding (LineFind) and tabstop finding (TabFind).
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76 class TESS_API AlignedBlob : public BlobGrid {
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77 public:
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78 AlignedBlob(int gridsize, const ICOORD &bleft, const ICOORD &tright);
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79 ~AlignedBlob() override;
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81 // Return true if the given coordinates are within the test rectangle
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82 // and the debug level is at least the given detail level.
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83 static bool WithinTestRegion(int detail_level, int x, int y);
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84
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85 // Display the tab codes of the BLOBNBOXes in this grid.
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86 ScrollView *DisplayTabs(const char *window_name, ScrollView *tab_win);
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87
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88 // Finds a vector corresponding to a set of vertically aligned blob edges
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89 // running through the given box. The type of vector returned and the
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90 // search parameters are determined by the AlignedBlobParams.
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91 // vertical_x and y are updated with an estimate of the real
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92 // vertical direction. (skew finding.)
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93 // Returns nullptr if no decent vector can be found.
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94 TabVector *FindVerticalAlignment(AlignedBlobParams align_params, BLOBNBOX *bbox, int *vertical_x,
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95 int *vertical_y);
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96
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97 private:
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98 // Find a set of blobs that are aligned in the given vertical
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99 // direction with the given blob. Returns a list of aligned
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100 // blobs and the number in the list.
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101 // For other parameters see FindAlignedBlob below.
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102 int AlignTabs(const AlignedBlobParams &params, bool top_to_bottom, BLOBNBOX *bbox,
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103 BLOBNBOX_CLIST *good_points, int *end_y);
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104
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105 // Search vertically for a blob that is aligned with the input bbox.
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106 // The search parameters are determined by AlignedBlobParams.
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107 // top_to_bottom tells whether to search down or up.
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108 // The return value is nullptr if nothing was found in the search box
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109 // or if a blob was found in the gutter. On a nullptr return, end_y
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110 // is set to the edge of the search box or the leading edge of the
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111 // gutter blob if one was found.
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112 BLOBNBOX *FindAlignedBlob(const AlignedBlobParams &p, bool top_to_bottom, BLOBNBOX *bbox,
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113 int x_start, int *end_y);
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114 };
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115
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116 } // namespace tesseract.
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117
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118 #endif // TESSERACT_TEXTORD_ALIGNEDBLOB_H_