Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/textord/ccnontextdetect.h @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: ccnontextdetect.h
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3 // Description: Connected-Component-based non-text detection.
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4 // Copyright 2011 Google Inc. All Rights Reserved.
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5 // Author: rays@google.com (Ray Smith)
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6 // Created: Sat Jun 11 09:52:01 PST 2011
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7 //
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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_CCPHOTODETECT_H_
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21 #define TESSERACT_TEXTORD_CCPHOTODETECT_H_
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23 #include "blobgrid.h"
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24 #include "scrollview.h"
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26 namespace tesseract {
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28 // The CCNonTextDetect class contains grid-based operations on blobs to create
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29 // a full-resolution image mask analogous yet complementary to
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30 // pixGenHalftoneMask as it is better at line-drawings, graphs and charts.
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31 class CCNonTextDetect : public BlobGrid {
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32 public:
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33 CCNonTextDetect(int gridsize, const ICOORD &bleft, const ICOORD &tright);
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34 ~CCNonTextDetect() override;
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35
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36 // Creates and returns a Pix with the same resolution as the original
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37 // in which 1 (black) pixels represent likely non text (photo, line drawing)
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38 // areas of the page, deleting from the blob_block the blobs that were
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39 // determined to be non-text.
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40 // The photo_map (binary image mask) is used to bias the decision towards
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41 // non-text, rather than supplying a definite decision.
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42 // The blob_block is the usual result of connected component analysis,
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43 // holding the detected blobs.
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44 // The returned Pix should be PixDestroyed after use.
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45 Image ComputeNonTextMask(bool debug, Image photo_map, TO_BLOCK *blob_block);
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46
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47 private:
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48 // Computes and returns the noise_density IntGrid, at the same gridsize as
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49 // this by summing the number of small elements in a 3x3 neighbourhood of
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50 // each grid cell. good_grid is filled with blobs that are considered most
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51 // likely good text, and this is filled with small and medium blobs that are
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52 // more likely non-text.
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53 // The photo_map is used to bias the decision towards non-text, rather than
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54 // supplying definite decision.
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55 IntGrid *ComputeNoiseDensity(bool debug, Image photo_map, BlobGrid *good_grid);
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56
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57 // Tests each blob in the list to see if it is certain non-text using 2
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58 // conditions:
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59 // 1. blob overlaps a cell with high value in noise_density_ (previously set
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60 // by ComputeNoiseDensity).
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61 // OR 2. The blob overlaps more than max_blob_overlaps in *this grid. This
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62 // condition is disabled with max_blob_overlaps == -1.
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63 // If it does, the blob is declared non-text, and is used to mark up the
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64 // nontext_mask. Such blobs are fully deleted, and non-noise blobs have their
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65 // neighbours reset, as they may now point to deleted data.
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66 // WARNING: The blobs list blobs may be in the *this grid, but they are
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67 // not removed. If any deleted blobs might be in *this, then this must be
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68 // Clear()ed immediately after MarkAndDeleteNonTextBlobs is called.
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69 // If the win is not nullptr, deleted blobs are drawn on it in red, and kept
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70 void MarkAndDeleteNonTextBlobs(BLOBNBOX_LIST *blobs, int max_blob_overlaps, ScrollView *win,
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71 ScrollView::Color ok_color, Image nontext_mask);
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72 // Returns true if the given blob overlaps more than max_overlaps blobs
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73 // in the current grid.
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74 bool BlobOverlapsTooMuch(BLOBNBOX *blob, int max_overlaps);
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75
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76 // Max entry in noise_density_ before the cell is declared noisy.
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77 int max_noise_count_;
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78 // Completed noise density map, which we keep around to use for secondary
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79 // noise detection.
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80 IntGrid *noise_density_;
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81 };
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82
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83 } // namespace tesseract.
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84
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85 #endif // TESSERACT_TEXTORD_CCPHOTODETECT_H_