Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/api/lstmboxrenderer.cpp @ 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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /**********************************************************************
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2 * File: lstmboxrenderer.cpp
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3 * Description: Renderer for creating box file for LSTM training.
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4 * based on the tsv renderer.
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5 *
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6 * (C) Copyright 2019, 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 #include <tesseract/baseapi.h> // for TessBaseAPI
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20 #include <tesseract/renderer.h>
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21 #include "helpers.h" // for copy_string
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22 #include "tesseractclass.h" // for Tesseract
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24 namespace tesseract {
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26 /**
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27 * Create a UTF8 box file for LSTM training from the internal data structures.
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28 * page_number is a 0-base page index that will appear in the box file.
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29 * Returned string must be freed with the delete [] operator.
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30 */
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31 static void AddBoxToLSTM(int right, int bottom, int top, int image_height, int page_num,
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32 std::string &text) {
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33 text += " " + std::to_string(image_height - bottom);
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34 text += " " + std::to_string(right + 5);
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35 text += " " + std::to_string(image_height - top);
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36 text += " " + std::to_string(page_num);
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37 }
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38
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39 char *TessBaseAPI::GetLSTMBoxText(int page_number = 0) {
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40 if (tesseract_ == nullptr || (page_res_ == nullptr && Recognize(nullptr) < 0)) {
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41 return nullptr;
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42 }
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44 std::string lstm_box_str;
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45 bool first_word = true;
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46 int left = 0, top = 0, right = 0, bottom = 0;
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47
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48 LTRResultIterator *res_it = GetLTRIterator();
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49 while (!res_it->Empty(RIL_BLOCK)) {
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50 if (res_it->Empty(RIL_SYMBOL)) {
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51 res_it->Next(RIL_SYMBOL);
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52 continue;
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53 }
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54 if (!first_word) {
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55 if (!(res_it->IsAtBeginningOf(RIL_TEXTLINE))) {
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56 if (res_it->IsAtBeginningOf(RIL_WORD)) {
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57 lstm_box_str += " " + std::to_string(left);
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58 AddBoxToLSTM(right, bottom, top, image_height_, page_number, lstm_box_str);
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59 lstm_box_str += "\n"; // end of row for word
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60 } // word
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61 } else {
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62 if (res_it->IsAtBeginningOf(RIL_TEXTLINE)) {
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63 lstm_box_str += "\t " + std::to_string(left);
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64 AddBoxToLSTM(right, bottom, top, image_height_, page_number, lstm_box_str);
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65 lstm_box_str += "\n"; // end of row for line
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66 } // line
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67 }
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68 } // not first word
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69 first_word = false;
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70 // Use bounding box for whole line for everything
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71 res_it->BoundingBox(RIL_TEXTLINE, &left, &top, &right, &bottom);
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72 do {
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73 lstm_box_str += std::unique_ptr<const char[]>(res_it->GetUTF8Text(RIL_SYMBOL)).get();
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74 res_it->Next(RIL_SYMBOL);
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75 } while (!res_it->Empty(RIL_BLOCK) && !res_it->IsAtBeginningOf(RIL_SYMBOL));
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76 lstm_box_str += " " + std::to_string(left);
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77 AddBoxToLSTM(right, bottom, top, image_height_, page_number, lstm_box_str);
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78 lstm_box_str += "\n"; // end of row for symbol
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79 }
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80 if (!first_word) { // if first_word is true => empty page
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81 lstm_box_str += "\t " + std::to_string(left);
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82 AddBoxToLSTM(right, bottom, top, image_height_, page_number, lstm_box_str);
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83 lstm_box_str += "\n"; // end of PAGE
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84 }
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85 delete res_it;
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86 return copy_string(lstm_box_str);
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87 }
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88
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89 /**********************************************************************
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90 * LSTMBox Renderer interface implementation
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91 **********************************************************************/
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92 TessLSTMBoxRenderer::TessLSTMBoxRenderer(const char *outputbase)
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93 : TessResultRenderer(outputbase, "box") {}
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94
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95 bool TessLSTMBoxRenderer::AddImageHandler(TessBaseAPI *api) {
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96 const std::unique_ptr<const char[]> lstmbox(api->GetLSTMBoxText(imagenum()));
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97 if (lstmbox == nullptr) {
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98 return false;
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99 }
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100
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101 AppendString(lstmbox.get());
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102
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103 return true;
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104 }
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105
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106 } // namespace tesseract.