Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/classify/intfeaturespace.h @ 39:a6bc019ac0b2 upstream

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ADD: PyMuPDF v1.26.5: the original sdist.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:19:58 +0200
parents b50eed0cc0ef
children
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1 // Copyright 2010 Google Inc. All Rights Reserved.
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2 // Author: rays@google.com (Ray Smith)
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3 ///////////////////////////////////////////////////////////////////////
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4 // File: intfeaturespace.h
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5 // Description: Indexed feature space based on INT_FEATURE_STRUCT.
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6 //
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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_CLASSIFY_INTFEATURESPACE_H_
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20 #define TESSERACT_CLASSIFY_INTFEATURESPACE_H_
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22 #include "intproto.h"
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24 // Extent of x,y,theta in the input feature space. [0,255].
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25 const int kIntFeatureExtent = 256;
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26 // Extent of x,y,theta dimensions in the quantized feature space.
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27 const int kBoostXYBuckets = 16;
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28 const int kBoostDirBuckets = 16;
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30 namespace tesseract {
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32 class IndexMap;
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34 // Down-sampling quantization of the INT_FEATURE_STRUCT feature space and
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35 // conversion to a single scalar index value, used as a binary feature space.
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36 class TESS_API IntFeatureSpace {
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37 public:
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38 IntFeatureSpace();
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39 // Default copy constructors and assignment OK!
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41 // Setup the feature space with the given dimensions.
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42 void Init(uint8_t xbuckets, uint8_t ybuckets, uint8_t thetabuckets);
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44 // Serializes the feature space definition to the given file.
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45 // Returns false on error.
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46 bool Serialize(FILE *fp) const;
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48 // Returns the total size of the feature space.
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49 int Size() const {
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50 return static_cast<int>(x_buckets_) * y_buckets_ * theta_buckets_;
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51 }
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52 // Returns an INT_FEATURE_STRUCT corresponding to the given index.
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53 // This is the inverse of the Index member.
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54 INT_FEATURE_STRUCT PositionFromIndex(int index) const;
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56 // Returns a 1-dimensional index corresponding to the given feature value.
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57 // Range is [0, Size()-1]. Inverse of PositionFromIndex member.
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58 int Index(const INT_FEATURE_STRUCT &f) const {
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59 return (XBucket(f.X) * y_buckets_ + YBucket(f.Y)) * theta_buckets_ + ThetaBucket(f.Theta);
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60 }
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61 // Bulk calls to Index. Maps the given array of features to a vector of
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62 // int32_t indices in the same order as the input.
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63 void IndexFeatures(const INT_FEATURE_STRUCT *features, int num_features,
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64 std::vector<int> *mapped_features) const;
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65 // Bulk calls to Index. Maps the given array of features to a vector of
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66 // sorted int32_t indices.
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67 void IndexAndSortFeatures(const INT_FEATURE_STRUCT *features, int num_features,
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68 std::vector<int> *sorted_features) const;
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69 // Returns a feature space index for the given x,y position in a display
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70 // window, or -1 if the feature is a miss.
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71 int XYToFeatureIndex(int x, int y) const;
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72
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73 protected:
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74 // Converters to generate indices for individual feature dimensions.
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75 int XBucket(int x) const {
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76 int bucket = x * x_buckets_ / kIntFeatureExtent;
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77 return ClipToRange(bucket, 0, static_cast<int>(x_buckets_) - 1);
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78 }
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79 int YBucket(int y) const {
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80 int bucket = y * y_buckets_ / kIntFeatureExtent;
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81 return ClipToRange(bucket, 0, static_cast<int>(y_buckets_) - 1);
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82 }
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83 // Use DivRounded for theta so that exactly vertical and horizontal are in
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84 // the middle of a bucket. The Modulo takes care of the wrap-around.
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85 int ThetaBucket(int theta) const {
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86 int bucket = DivRounded(theta * theta_buckets_, kIntFeatureExtent);
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87 return Modulo(bucket, theta_buckets_);
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88 }
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89 // Returns an INT_FEATURE_STRUCT corresponding to the given buckets.
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90 INT_FEATURE_STRUCT PositionFromBuckets(int x, int y, int theta) const;
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91
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92 // Feature space definition - serialized.
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93 uint8_t x_buckets_;
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94 uint8_t y_buckets_;
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95 uint8_t theta_buckets_;
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96 };
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97
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98 } // namespace tesseract.
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parents:
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100 #endif // TESSERACT_CLASSIFY_INTFEATURESPACE_H_