Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccmain/thresholder.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: thresholder.h
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3 // Description: Base API for thresholding images in tesseract.
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4 // Author: Ray Smith
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5 //
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6 // (C) Copyright 2008, 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 #ifndef TESSERACT_CCMAIN_THRESHOLDER_H_
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20 #define TESSERACT_CCMAIN_THRESHOLDER_H_
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22 #include <tesseract/export.h>
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24 #include <vector> // for std::vector
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26 struct Pix;
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28 namespace tesseract {
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30 enum class ThresholdMethod {
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31 Otsu, // Tesseract's legacy Otsu
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32 LeptonicaOtsu, // Leptonica's Otsu
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33 Sauvola, // Leptonica's Sauvola
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34 Max, // Number of Thresholding methods
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35 };
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37 class TessBaseAPI;
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39 /// Base class for all tesseract image thresholding classes.
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40 /// Specific classes can add new thresholding methods by
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41 /// overriding ThresholdToPix.
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42 /// Each instance deals with a single image, but the design is intended to
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43 /// be useful for multiple calls to SetRectangle and ThresholdTo* if
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44 /// desired.
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45 class TESS_API ImageThresholder {
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46 public:
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47 ImageThresholder();
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48 virtual ~ImageThresholder();
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50 /// Destroy the Pix if there is one, freeing memory.
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51 virtual void Clear();
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53 /// Return true if no image has been set.
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54 bool IsEmpty() const;
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56 /// SetImage makes a copy of all the image data, so it may be deleted
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57 /// immediately after this call.
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58 /// Greyscale of 8 and color of 24 or 32 bits per pixel may be given.
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59 /// Palette color images will not work properly and must be converted to
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60 /// 24 bit.
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61 /// Binary images of 1 bit per pixel may also be given but they must be
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62 /// byte packed with the MSB of the first byte being the first pixel, and a
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63 /// one pixel is WHITE. For binary images set bytes_per_pixel=0.
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64 void SetImage(const unsigned char *imagedata, int width, int height, int bytes_per_pixel,
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65 int bytes_per_line);
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66
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67 /// Store the coordinates of the rectangle to process for later use.
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68 /// Doesn't actually do any thresholding.
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69 void SetRectangle(int left, int top, int width, int height);
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70
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71 /// Get enough parameters to be able to rebuild bounding boxes in the
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72 /// original image (not just within the rectangle).
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73 /// Left and top are enough with top-down coordinates, but
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74 /// the height of the rectangle and the image are needed for bottom-up.
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75 virtual void GetImageSizes(int *left, int *top, int *width, int *height, int *imagewidth,
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76 int *imageheight);
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78 /// Return true if the source image is color.
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79 bool IsColor() const {
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80 return pix_channels_ >= 3;
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81 }
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82
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83 /// Returns true if the source image is binary.
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84 bool IsBinary() const {
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85 return pix_channels_ == 0;
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86 }
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87
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88 int GetScaleFactor() const {
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89 return scale_;
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90 }
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92 // Set the resolution of the source image in pixels per inch.
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93 // This should be called right after SetImage(), and will let us return
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94 // appropriate font sizes for the text.
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95 void SetSourceYResolution(int ppi) {
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96 yres_ = ppi;
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97 estimated_res_ = ppi;
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98 }
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99 int GetSourceYResolution() const {
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100 return yres_;
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101 }
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102 int GetScaledYResolution() const {
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103 return scale_ * yres_;
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104 }
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105 // Set the resolution of the source image in pixels per inch, as estimated
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106 // by the thresholder from the text size found during thresholding.
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107 // This value will be used to set internal size thresholds during recognition
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108 // and will not influence the output "point size." The default value is
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109 // the same as the source resolution. (yres_)
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110 void SetEstimatedResolution(int ppi) {
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111 estimated_res_ = ppi;
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112 }
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113 // Returns the estimated resolution, including any active scaling.
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114 // This value will be used to set internal size thresholds during recognition.
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115 int GetScaledEstimatedResolution() const {
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116 return scale_ * estimated_res_;
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117 }
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118
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119 /// Pix vs raw, which to use? Pix is the preferred input for efficiency,
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120 /// since raw buffers are copied.
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121 /// SetImage for Pix clones its input, so the source pix may be pixDestroyed
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122 /// immediately after, but may not go away until after the Thresholder has
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123 /// finished with it.
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124 void SetImage(const Image pix);
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125
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126 /// Threshold the source image as efficiently as possible to the output Pix.
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127 /// Creates a Pix and sets pix to point to the resulting pointer.
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128 /// Caller must use pixDestroy to free the created Pix.
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129 /// Returns false on error.
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130 virtual bool ThresholdToPix(Image *pix);
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131
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132 virtual std::tuple<bool, Image, Image, Image> Threshold(TessBaseAPI *api,
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133 ThresholdMethod method);
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134
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135 // Gets a pix that contains an 8 bit threshold value at each pixel. The
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136 // returned pix may be an integer reduction of the binary image such that
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137 // the scale factor may be inferred from the ratio of the sizes, even down
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138 // to the extreme of a 1x1 pixel thresholds image.
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139 // Ideally the 8 bit threshold should be the exact threshold used to generate
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140 // the binary image in ThresholdToPix, but this is not a hard constraint.
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141 // Returns nullptr if the input is binary. PixDestroy after use.
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142 virtual Image GetPixRectThresholds();
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143
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144 /// Get a clone/copy of the source image rectangle.
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145 /// The returned Pix must be pixDestroyed.
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146 /// This function will be used in the future by the page layout analysis, and
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147 /// the layout analysis that uses it will only be available with Leptonica,
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148 /// so there is no raw equivalent.
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149 Image GetPixRect();
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150
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151 // Get a clone/copy of the source image rectangle, reduced to greyscale,
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152 // and at the same resolution as the output binary.
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153 // The returned Pix must be pixDestroyed.
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154 // Provided to the classifier to extract features from the greyscale image.
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155 virtual Image GetPixRectGrey();
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156
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157 protected:
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158 // ----------------------------------------------------------------------
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159 // Utility functions that may be useful components for other thresholders.
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160
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161 /// Common initialization shared between SetImage methods.
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162 virtual void Init();
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163
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164 /// Return true if we are processing the full image.
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165 bool IsFullImage() const {
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166 return rect_left_ == 0 && rect_top_ == 0 && rect_width_ == image_width_ &&
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167 rect_height_ == image_height_;
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168 }
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169
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170 // Otsu thresholds the rectangle, taking the rectangle from *this.
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171 void OtsuThresholdRectToPix(Image src_pix, Image *out_pix) const;
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172
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173 /// Threshold the rectangle, taking everything except the src_pix
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174 /// from the class, using thresholds/hi_values to the output pix.
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175 /// NOTE that num_channels is the size of the thresholds and hi_values
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176 // arrays and also the bytes per pixel in src_pix.
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177 void ThresholdRectToPix(Image src_pix, int num_channels, const std::vector<int> &thresholds,
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178 const std::vector <int> &hi_values, Image *pix) const;
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179
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180 protected:
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181 /// Clone or other copy of the source Pix.
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182 /// The pix will always be PixDestroy()ed on destruction of the class.
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183 Image pix_;
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184
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185 int image_width_; ///< Width of source pix_.
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186 int image_height_; ///< Height of source pix_.
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187 int pix_channels_; ///< Number of 8-bit channels in pix_.
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188 int pix_wpl_; ///< Words per line of pix_.
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189 // Limits of image rectangle to be processed.
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190 int scale_; ///< Scale factor from original image.
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191 int yres_; ///< y pixels/inch in source image.
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192 int estimated_res_; ///< Resolution estimate from text size.
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193 int rect_left_;
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194 int rect_top_;
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195 int rect_width_;
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196 int rect_height_;
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197 };
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198
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199 } // namespace tesseract.
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200
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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201 #endif // TESSERACT_CCMAIN_THRESHOLDER_H_