Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/textord/devanagari_processing.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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children
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1 // Copyright 2008 Google Inc. All Rights Reserved.
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2 // Author: shobhitsaxena@google.com (Shobhit Saxena)
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3 // Licensed under the Apache License, Version 2.0 (the "License");
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4 // you may not use this file except in compliance with the License.
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5 // You may obtain a copy of the License at
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6 // http://www.apache.org/licenses/LICENSE-2.0
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7 // Unless required by applicable law or agreed to in writing, software
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8 // distributed under the License is distributed on an "AS IS" BASIS,
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9 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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10 // See the License for the specific language governing permissions and
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11 // limitations under the License.
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13 #ifndef TESSERACT_TEXTORD_DEVNAGARI_PROCESSING_H_
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14 #define TESSERACT_TEXTORD_DEVNAGARI_PROCESSING_H_
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16 #include <allheaders.h>
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17 #include "ocrblock.h"
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18 #include "params.h"
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20 struct Pix;
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21 struct Box;
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22 struct Boxa;
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24 namespace tesseract {
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26 extern INT_VAR_H(devanagari_split_debuglevel);
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28 extern BOOL_VAR_H(devanagari_split_debugimage);
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30 class TBOX;
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31 class DebugPixa;
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33 class PixelHistogram {
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34 public:
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35 PixelHistogram() {
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36 hist_ = nullptr;
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37 length_ = 0;
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38 }
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40 ~PixelHistogram() {
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41 Clear();
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42 }
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44 void Clear() {
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45 delete[] hist_;
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46 length_ = 0;
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47 }
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49 int *hist() const {
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50 return hist_;
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51 }
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53 int length() const {
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54 return length_;
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55 }
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57 // Methods to construct histograms from images. These clear any existing data.
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58 void ConstructVerticalCountHist(Image pix);
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59 void ConstructHorizontalCountHist(Image pix);
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61 // This method returns the global-maxima for the histogram. The frequency of
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62 // the global maxima is returned in count, if specified.
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63 int GetHistogramMaximum(int *count) const;
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64
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65 private:
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66 int *hist_;
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67 int length_;
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68 };
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70 class ShiroRekhaSplitter {
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71 public:
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72 enum SplitStrategy {
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73 NO_SPLIT = 0, // No splitting is performed for the phase.
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74 MINIMAL_SPLIT, // Blobs are split minimally.
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75 MAXIMAL_SPLIT // Blobs are split maximally.
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76 };
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78 ShiroRekhaSplitter();
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79 virtual ~ShiroRekhaSplitter();
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81 // Top-level method to perform splitting based on current settings.
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82 // Returns true if a split was actually performed.
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83 // If split_for_pageseg is true, the pageseg_split_strategy_ is used for
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84 // splitting. If false, the ocr_split_strategy_ is used.
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85 bool Split(bool split_for_pageseg, DebugPixa *pixa_debug);
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87 // Clears the memory held by this object.
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88 void Clear();
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90 // Refreshes the words in the segmentation block list by using blobs in the
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91 // input blob list.
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92 // The segmentation block list must be set.
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93 void RefreshSegmentationWithNewBlobs(C_BLOB_LIST *new_blobs);
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95 // Returns true if the split strategies for pageseg and ocr are different.
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96 bool HasDifferentSplitStrategies() const {
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97 return pageseg_split_strategy_ != ocr_split_strategy_;
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98 }
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100 // This only keeps a copy of the block list pointer. At split call, the list
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101 // object should still be alive. This block list is used as a golden
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102 // segmentation when performing splitting.
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103 void set_segmentation_block_list(BLOCK_LIST *block_list) {
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104 segmentation_block_list_ = block_list;
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105 }
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106
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107 static const int kUnspecifiedXheight = -1;
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108
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109 void set_global_xheight(int xheight) {
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110 global_xheight_ = xheight;
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111 }
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112
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113 void set_perform_close(bool perform) {
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114 perform_close_ = perform;
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115 }
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116
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117 // Returns the image obtained from shiro-rekha splitting. The returned object
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118 // is owned by this class. Callers may want to clone the returned pix to keep
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119 // it alive beyond the life of ShiroRekhaSplitter object.
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120 Image splitted_image() {
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121 return splitted_image_;
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122 }
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123
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124 // On setting the input image, a clone of it is owned by this class.
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125 void set_orig_pix(Image pix);
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126
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127 // Returns the input image provided to the object. This object is owned by
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128 // this class. Callers may want to clone the returned pix to work with it.
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129 Image orig_pix() {
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130 return orig_pix_;
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131 }
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132
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133 SplitStrategy ocr_split_strategy() const {
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134 return ocr_split_strategy_;
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135 }
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136
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137 void set_ocr_split_strategy(SplitStrategy strategy) {
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138 ocr_split_strategy_ = strategy;
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139 }
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140
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141 SplitStrategy pageseg_split_strategy() const {
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142 return pageseg_split_strategy_;
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143 }
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144
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145 void set_pageseg_split_strategy(SplitStrategy strategy) {
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146 pageseg_split_strategy_ = strategy;
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147 }
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148
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149 BLOCK_LIST *segmentation_block_list() {
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150 return segmentation_block_list_;
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151 }
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152
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153 // This method returns the computed mode-height of blobs in the pix.
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154 // It also prunes very small blobs from calculation. Could be used to provide
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155 // a global xheight estimate for images which have the same point-size text.
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156 static int GetModeHeight(Image pix);
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157
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158 private:
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159 // Method to perform a close operation on the input image. The xheight
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160 // estimate decides the size of sel used.
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161 static void PerformClose(Image pix, int xheight_estimate);
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162
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163 // This method resolves the cc bbox to a particular row and returns the row's
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164 // xheight. This uses block_list_ if available, else just returns the
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165 // global_xheight_ estimate currently set in the object.
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166 int GetXheightForCC(Box *cc_bbox);
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167
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168 // Returns a list of regions (boxes) which should be cleared in the original
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169 // image so as to perform shiro-rekha splitting. Pix is assumed to carry one
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170 // (or less) word only. Xheight measure could be the global estimate, the row
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171 // estimate, or unspecified. If unspecified, over splitting may occur, since a
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172 // conservative estimate of stroke width along with an associated multiplier
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173 // is used in its place. It is advisable to have a specified xheight when
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174 // splitting for classification/training.
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175 void SplitWordShiroRekha(SplitStrategy split_strategy, Image pix, int xheight, int word_left,
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176 int word_top, Boxa *regions_to_clear);
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177
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178 // Returns a new box object for the corresponding TBOX, based on the original
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179 // image's coordinate system.
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180 Box *GetBoxForTBOX(const TBOX &tbox) const;
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181
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182 // This method returns y-extents of the shiro-rekha computed from the input
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183 // word image.
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184 static void GetShiroRekhaYExtents(Image word_pix, int *shirorekha_top, int *shirorekha_bottom,
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185 int *shirorekha_ylevel);
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186
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187 Image orig_pix_; // Just a clone of the input image passed.
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188 Image splitted_image_; // Image produced after the last splitting round. The
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189 // object is owned by this class.
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190 SplitStrategy pageseg_split_strategy_;
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191 SplitStrategy ocr_split_strategy_;
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192 Image debug_image_;
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193 // This block list is used as a golden segmentation when performing splitting.
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194 BLOCK_LIST *segmentation_block_list_;
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195 int global_xheight_;
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196 bool perform_close_; // Whether a morphological close operation should be
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197 // performed before CCs are run through splitting.
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198 };
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199
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200 } // namespace tesseract.
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201
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parents:
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202 #endif // TESSERACT_TEXTORD_DEVNAGARI_PROCESSING_H_