Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/textord/imagefind.h @ 21:2f43e400f144

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Provide an "all" target to build both the sdist and the wheel
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 10:28:53 +0200
parents b50eed0cc0ef
children
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: imagefind.h
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3 // Description: Class to find image and drawing regions in an image
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4 // and create a corresponding list of empty blobs.
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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_IMAGEFIND_H_
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21 #define TESSERACT_TEXTORD_IMAGEFIND_H_
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23 #include "debugpixa.h"
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25 #include <cstdint>
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27 namespace tesseract {
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29 class ColPartitionGrid;
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30 class ColPartition_LIST;
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31 class TabFind;
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32 class TBOX;
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33 class FCOORD;
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34 class TO_BLOCK;
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36 // The ImageFind class is a simple static function wrapper class that
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37 // exposes the FindImages function and some useful helper functions.
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38 class ImageFind {
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39 public:
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40 // Finds image regions within the BINARY source pix (page image) and returns
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41 // the image regions as a mask image.
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42 // The returned pix may be nullptr, meaning no images found.
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43 // If not nullptr, it must be PixDestroyed by the caller.
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44 // If textord_tabfind_show_images, debug images are appended to pixa_debug.
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45 static Image FindImages(Image pix, DebugPixa *pixa_debug);
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47 // Given an input pix, and a bounding rectangle, the sides of the rectangle
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48 // are shrunk inwards until they bound any black pixels found within the
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49 // original rectangle. Returns false if the rectangle contains no black
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50 // pixels at all.
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51 static bool BoundsWithinRect(Image pix, int *x_start, int *y_start, int *x_end, int *y_end);
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53 // Given a point in 3-D (RGB) space, returns the squared Euclidean distance
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54 // of the point from the given line, defined by a pair of points in the 3-D
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55 // (RGB) space, line1 and line2.
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56 static double ColorDistanceFromLine(const uint8_t *line1, const uint8_t *line2,
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57 const uint8_t *point);
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59 // Returns true if there are no black pixels in between the boxes.
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60 // The im_box must represent the bounding box of the pix in tesseract
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61 // coordinates, which may be negative, due to rotations to make the textlines
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62 // horizontal. The boxes are rotated by rotation, which should undo such
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63 // rotations, before mapping them onto the pix.
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64 static bool BlankImageInBetween(const TBOX &box1, const TBOX &box2, const TBOX &im_box,
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65 const FCOORD &rotation, Image pix);
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66
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67 // Returns the number of pixels in box in the pix.
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68 // The im_box must represent the bounding box of the pix in tesseract
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69 // coordinates, which may be negative, due to rotations to make the textlines
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70 // horizontal. The boxes are rotated by rotation, which should undo such
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71 // rotations, before mapping them onto the pix.
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72 static int CountPixelsInRotatedBox(TBOX box, const TBOX &im_box, const FCOORD &rotation,
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73 Image pix);
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74
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75 // Locates all the image partitions in the part_grid, that were found by a
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76 // previous call to FindImagePartitions, marks them in the image_mask,
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77 // removes them from the grid, and deletes them. This makes it possible to
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78 // call FindImagePartitions again to produce less broken-up and less
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79 // overlapping image partitions.
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80 // rerotation specifies how to rotate the partition coords to match
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81 // the image_mask, since this function is used after orientation correction.
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82 static void TransferImagePartsToImageMask(const FCOORD &rerotation, ColPartitionGrid *part_grid,
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83 Image image_mask);
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84
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85 // Runs a CC analysis on the image_pix mask image, and creates
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86 // image partitions from them, cutting out strong text, and merging with
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87 // nearby image regions such that they don't interfere with text.
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88 // Rotation and rerotation specify how to rotate image coords to match
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89 // the blob and partition coords and back again.
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90 // The input/output part_grid owns all the created partitions, and
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91 // the partitions own all the fake blobs that belong in the partitions.
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92 // Since the other blobs in the other partitions will be owned by the block,
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93 // ColPartitionGrid::ReTypeBlobs must be called afterwards to fix this
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94 // situation and collect the image blobs.
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95 static void FindImagePartitions(Image image_pix, const FCOORD &rotation, const FCOORD &rerotation,
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96 TO_BLOCK *block, TabFind *tab_grid, DebugPixa *pixa_debug,
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97 ColPartitionGrid *part_grid, ColPartition_LIST *big_parts);
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98 };
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99
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100 } // namespace tesseract.
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101
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102 #endif // TESSERACT_TEXTORD_LINEFIND_H_