Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/leptonica/src/dewarp.h @ 32:72c1b70d4f5c

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 15:10:12 +0200
parents b50eed0cc0ef
children
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1 /*====================================================================*
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2 - Copyright (C) 2001 Leptonica. All rights reserved.
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3 -
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4 - Redistribution and use in source and binary forms, with or without
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5 - modification, are permitted provided that the following conditions
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6 - are met:
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7 - 1. Redistributions of source code must retain the above copyright
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8 - notice, this list of conditions and the following disclaimer.
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9 - 2. Redistributions in binary form must reproduce the above
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10 - copyright notice, this list of conditions and the following
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11 - disclaimer in the documentation and/or other materials
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12 - provided with the distribution.
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13 -
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14 - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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15 - ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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16 - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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17 - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANY
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18 - CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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19 - EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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20 - PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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21 - PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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22 - OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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23 - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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24 - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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25 *====================================================================*/
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26
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27 #ifndef LEPTONICA_DEWARP_H
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28 #define LEPTONICA_DEWARP_H
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29
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30 /*!
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31 * \file dewarp.h
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32 *
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33 * <pre>
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34 * Data structure to hold arrays and results for generating
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35 * horizontal and vertical disparity arrays based on textlines.
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36 * Each disparity array is two-dimensional. The vertical disparity
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37 * array gives a vertical displacement, relative to the lowest point
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38 * in the textlines. The horizontal disparty array gives a horizontal
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39 * displacement, relative to the minimum values (for even pages)
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40 * or maximum values (for odd pages) of the left and right ends of
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41 * full textlines. Horizontal alignment always involves translations
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42 * away from the book gutter.
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43 *
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44 * We have intentionally separated the process of building models
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45 * from the rendering process that uses the models. For any page,
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46 * the building operation either creates an actual model (that is,
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47 * a model with at least the vertical disparity being computed, and
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48 * for which the 'success' flag is set) or fails to create a model.
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49 * However, at rendering time, a page can have one of two different
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50 * types of models.
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51 * (1) A valid model is an actual model that meets the rendering
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52 * constraints, which are limits on model curvature parameters.
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53 * See dewarpaTestForValidModel() for details.
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54 * Valid models are identified by dewarpaInsertRefModels(),
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55 * which sets the 'vvalid' and 'hvalid' fields. Only valid
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56 * models are used for rendering.
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57 * (2) A reference model is used by a page that doesn't have
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58 * a valid model, but has a nearby valid model of the same
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59 * parity (even/odd page) that it can use. The range in pages
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60 * to search for a valid model is given by the 'maxdist' field.
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61 *
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62 * At the rendering stage, vertical and horizontal disparities are
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63 * treated differently. It is somewhat more robust to generate
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64 * vertical disparity models (VDM) than horizontal disparity
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65 * models (HDM). A valid VDM is required for any correction to
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66 * be made; if a valid VDM is not available, just use the input
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67 * image. Otherwise, assuming it is available, the use of the
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68 * HDM is controlled by two fields: 'useboth' and 'check_columns'.
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69 * (a) With useboth == 0, we use only the VDM.
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70 * (b) With useboth == 1, we require using the VDM and, if a valid
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71 * horizontal disparity model (HDM) is available, we also use it.
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72 * (c) With check_columns == 1, check for multiple columns and if
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73 * true, only use the VDM, even if a valid HDM is available.
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74 * Note that 'check_columns' takes precedence over 'useboth'
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75 * when there is more than 1 column of text. By default,
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76 * check_columns == 0.
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77 *
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78 * The 'maxdist' parameter is input when the dewarpa is created.
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79 * The other rendering parameters have default values given in dewarp1.c.
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80 * All parameters used by rendering can be set (or reset) using accessors.
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81 *
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82 * After dewarping, use of the VDM will cause all points on each
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83 * altered curve to have a y-value equal to the minimum. Use of
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84 * the HDA will cause the left and right edges of the textlines
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85 * to be vertically aligned if they had been typeset flush-left
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86 * and flush-right, respectively.
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87 *
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88 * The sampled disparity arrays are expanded to full resolution,
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89 * using linear interpolation, and this is further expanded
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90 * by slope continuation to the right and below if the image
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91 * is larger than the full resolution disparity arrays. Then
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92 * the disparity correction can be applied to the input image.
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93 * If the input pix are 2x reduced, the expansion from sampled
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94 * to full res uses the product of (sampling) * (redfactor).
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95 *
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96 * The most accurate results are produced at full resolution, and
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97 * this is generally recommended.
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98 * </pre>
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99 */
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100
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101 /*! Dewarp version for serialization
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102 * <pre>
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103 * Note on versioning of the serialization of this data structure:
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104 * The dewarping utility and the stored data can be expected to change.
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105 * In most situations, the serialized version is ephemeral -- it is
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106 * not needed after being used. No functions will be provided to
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107 * convert between different versions.
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108 * </pre>
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109 */
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110 #define DEWARP_VERSION_NUMBER 4
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111
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112 /*! Data structure to hold a number of Dewarp */
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113 struct L_Dewarpa
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114 {
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115 l_int32 nalloc; /*!< size of dewarp ptr array */
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116 l_int32 maxpage; /*!< maximum page number in array */
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117 struct L_Dewarp **dewarp; /*!< array of ptrs to page dewarp */
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118 struct L_Dewarp **dewarpcache; /*!< array of ptrs to cached dewarps */
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119 struct Numa *namodels; /*!< list of page numbers for pages */
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120 /*!< with page models */
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121 struct Numa *napages; /*!< list of page numbers with either */
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122 /*!< page models or ref page models */
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123 l_int32 redfactor; /*!< reduction factor of input: 1 or 2 */
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124 l_int32 sampling; /*!< disparity arrays sampling factor */
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125 l_int32 minlines; /*!< min number of long lines required */
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126 l_int32 maxdist; /*!< max distance for getting ref page */
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127 l_int32 max_linecurv; /*!< maximum abs line curvature, */
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128 /*!< in micro-units */
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129 l_int32 min_diff_linecurv; /*!< minimum abs diff line */
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130 /*!< curvature in micro-units */
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131 l_int32 max_diff_linecurv; /*!< maximum abs diff line */
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132 /*!< curvature in micro-units */
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133 l_int32 max_edgeslope; /*!< maximum abs left or right edge */
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134 /*!< slope, in milli-units */
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135 l_int32 max_edgecurv; /*!< maximum abs left or right edge */
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136 /*!< curvature, in micro-units */
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137 l_int32 max_diff_edgecurv; /*!< maximum abs diff left-right */
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138 /*!< edge curvature, in micro-units */
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139 l_int32 useboth; /*!< use both disparity arrays if */
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140 /*!< available; only vertical otherwise */
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141 l_int32 check_columns; /*!< if there are multiple columns, */
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142 /*!< only use the vertical disparity */
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143 /*!< array */
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144 l_int32 modelsready; /*!< invalid models have been removed */
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145 /*!< and refs built against valid set */
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146 };
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147 typedef struct L_Dewarpa L_DEWARPA;
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148
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149
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150 /*! Data structure for a single dewarp */
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151 struct L_Dewarp
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152 {
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153 struct L_Dewarpa *dewa; /*!< ptr to parent (not owned) */
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154 struct Pix *pixs; /*!< source pix, 1 bpp */
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155 struct FPix *sampvdispar; /*!< sampled vert disparity array */
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156 struct FPix *samphdispar; /*!< sampled horiz disparity array */
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157 struct FPix *sampydispar; /*!< sampled slope h-disparity array */
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158 struct FPix *fullvdispar; /*!< full vert disparity array */
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159 struct FPix *fullhdispar; /*!< full horiz disparity array */
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160 struct FPix *fullydispar; /*!< full slope h-disparity array */
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161 struct Numa *namidys; /*!< sorted y val of midpoint each line */
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162 struct Numa *nacurves; /*!< sorted curvature of each line */
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163 l_int32 w; /*!< width of source image */
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164 l_int32 h; /*!< height of source image */
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165 l_int32 pageno; /*!< page number; important for reuse */
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166 l_int32 sampling; /*!< sampling factor of disparity arrays */
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167 l_int32 redfactor; /*!< reduction factor of pixs: 1 or 2 */
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168 l_int32 minlines; /*!< min number of long lines required */
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169 l_int32 nlines; /*!< number of long lines found */
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170 l_int32 mincurv; /*!< min line curvature in micro-units */
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171 l_int32 maxcurv; /*!< max line curvature in micro-units */
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172 l_int32 leftslope; /*!< left edge slope in milli-units */
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173 l_int32 rightslope; /*!< right edge slope in milli-units */
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174 l_int32 leftcurv; /*!< left edge curvature in micro-units */
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175 l_int32 rightcurv; /*!< right edge curvature in micro-units*/
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176 l_int32 nx; /*!< number of sampling pts in x-dir */
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177 l_int32 ny; /*!< number of sampling pts in y-dir */
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178 l_int32 hasref; /*!< 0 if normal; 1 if has a refpage */
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179 l_int32 refpage; /*!< page with disparity model to use */
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180 l_int32 vsuccess; /*!< sets to 1 if vert disparity builds */
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181 l_int32 hsuccess; /*!< sets to 1 if horiz disparity builds */
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182 l_int32 ysuccess; /*!< sets to 1 if slope disparity builds */
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183 l_int32 vvalid; /*!< sets to 1 if valid vert disparity */
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184 l_int32 hvalid; /*!< sets to 1 if valid horiz disparity */
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185 l_int32 skip_horiz; /*!< if 1, skip horiz disparity */
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186 /*!< correction */
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187 l_int32 debug; /*!< set to 1 if debug output requested */
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188 };
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189 typedef struct L_Dewarp L_DEWARP;
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190
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191 #endif /* LEPTONICA_DEWARP_H */