Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/classify/kdtree.h @ 21:2f43e400f144

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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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2
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1 /******************************************************************************
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2 ** Filename: kdtree.h
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3 ** Purpose: Definition of K-D tree access routines.
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4 ** Author: Dan Johnson
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5 **
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6 ** (c) Copyright Hewlett-Packard Company, 1988.
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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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18 #ifndef KDTREE_H
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19 #define KDTREE_H
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21 #include "ocrfeatures.h"
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23 namespace tesseract {
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25 /**
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26 NOTE: All circular parameters of all keys must be in the range
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28 Min <= Param < Max
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30 where Min and Max are specified in the KeyDesc parameter passed to
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31 MakeKDTree. All KD routines assume that this is true and will not operate
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32 correctly if circular parameters outside the specified range are used.
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33 */
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35 struct ClusteringContext;
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36 struct CLUSTER;
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37 struct KDTREE;
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39 using kdwalk_proc = void (*)(ClusteringContext *context, CLUSTER *Cluster, int32_t Level);
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41 struct KDNODE {
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42 /// This routine allocates memory for a new K-D tree node
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43 /// and places the specified Key and Data into it. The
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44 /// left and right subtree pointers for the node are
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45 /// initialized to empty subtrees.
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46 /// @param tree The tree to create the node for
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47 /// @param Key Access key for new node in KD tree
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48 /// @param Data ptr to data to be stored in new node
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49 /// @param Index index of Key to branch on
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50 KDNODE() = default;
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51 KDNODE(KDTREE *tree, float key[], CLUSTER *data, int Index);
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52 ~KDNODE() {
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53 delete Left;
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54 delete Right;
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55 }
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57 float *Key; /**< search key */
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58 CLUSTER *Data; /**< data that corresponds to key */
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59 float BranchPoint; /**< needed to make deletes work efficiently */
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60 float LeftBranch; /**< used to optimize search pruning */
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61 float RightBranch; /**< used to optimize search pruning */
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62 KDNODE *Left; /**< ptrs for KD tree structure */
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63 KDNODE *Right;
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64 };
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66 struct KDTREE {
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67 KDTREE(size_t n) : KeySize(n), KeyDesc(n) {
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68 }
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70 // The destructor frees all memory which is allocated to the
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71 // specified KD-tree. This includes the data structure for
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72 // the kd-tree itself plus the data structures for each node
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73 // in the tree. It does not include the Key and Data items
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74 // which are pointed to by the nodes. This memory is left
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75 // untouched.
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76 ~KDTREE() {
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77 }
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78
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79 // TODO: KeySize might be replaced by KeyDesc.size().
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80 int16_t KeySize = 0; // number of dimensions in the tree
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81 KDNODE Root; // Root.Left points to actual root node
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82 std::vector<PARAM_DESC> KeyDesc; // description of each dimension
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83 };
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84
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85 inline KDNODE::KDNODE(KDTREE *tree, float key[], CLUSTER *data, int Index) {
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86 Key = key;
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87 Data = data;
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88 BranchPoint = Key[Index];
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89 LeftBranch = tree->KeyDesc[Index].Min;
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90 RightBranch = tree->KeyDesc[Index].Max;
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91 Left = nullptr;
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92 Right = nullptr;
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93 }
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94
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95 /*----------------------------------------------------------------------------
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96 Macros
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97 -----------------------------------------------------------------------------*/
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98 #define RootOf(T) ((T)->Root.Left->Data)
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99
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100 /*-----------------------------------------------------------------------------
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101 Public Function Prototypes
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102 -----------------------------------------------------------------------------*/
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103 KDTREE *MakeKDTree(int16_t KeySize, const PARAM_DESC KeyDesc[]);
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104
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105 void KDStore(KDTREE *Tree, float *Key, CLUSTER *Data);
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106
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107 void KDDelete(KDTREE *Tree, float Key[], void *Data);
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108
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109 void KDNearestNeighborSearch(KDTREE *Tree, float Query[], int QuerySize, float MaxDistance,
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110 int *NumberOfResults, void **NBuffer, float DBuffer[]);
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111
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112 void KDWalk(KDTREE *Tree, kdwalk_proc Action, ClusteringContext *context);
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113
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114 /*-----------------------------------------------------------------------------
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115 Private Function Prototypes
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116 -----------------------------------------------------------------------------*/
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117
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118 float DistanceSquared(int k, PARAM_DESC *dim, float p1[], float p2[]);
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119
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120 TESS_API
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121 float ComputeDistance(int k, PARAM_DESC *dim, float p1[], float p2[]);
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122
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123 int QueryInSearch(KDTREE *tree);
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124
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125 void Walk(KDTREE *tree, kdwalk_proc action, ClusteringContext *context, KDNODE *SubTree, int32_t Level);
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126
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127 void InsertNodes(KDTREE *tree, KDNODE *nodes);
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128
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129 } // namespace tesseract
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130
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131 #endif