Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccstruct/dppoint.h @ 33:c4daa0c83d64

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 17:55:13 +0200
parents b50eed0cc0ef
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1 /**********************************************************************
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2 * File: dppoint.h
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3 * Description: Simple generic dynamic programming class.
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4 * Author: Ray Smith
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5 * Created: Wed Mar 25 18:57:01 PDT 2009
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6 *
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7 * (C) Copyright 2009, Google Inc.
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8 ** Licensed under the Apache License, Version 2.0 (the "License");
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9 ** you may not use this file except in compliance with the License.
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10 ** You may obtain a copy of the License at
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11 ** http://www.apache.org/licenses/LICENSE-2.0
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12 ** Unless required by applicable law or agreed to in writing, software
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13 ** distributed under the License is distributed on an "AS IS" BASIS,
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14 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 ** See the License for the specific language governing permissions and
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16 ** limitations under the License.
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17 *
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18 **********************************************************************/
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20 #ifndef TESSERACT_CCSTRUCT_DPPOINT_H_
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21 #define TESSERACT_CCSTRUCT_DPPOINT_H_
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23 #include <cstdint>
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25 namespace tesseract {
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27 // A simple class to provide a dynamic programming solution to a class of
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28 // 1st-order problems in which the cost is dependent only on the current
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29 // step and the best cost to that step, with a possible special case
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30 // of using the variance of the steps, and only the top choice is required.
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31 // Useful for problems such as finding the optimal cut points in a fixed-pitch
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32 // (vertical or horizontal) situation.
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33 // Skeletal Example:
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34 // DPPoint* array = new DPPoint[width];
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35 // for (int i = 0; i < width; i++) {
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36 // array[i].AddLocalCost(cost_at_i)
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37 // }
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38 // DPPoint* best_end = DPPoint::Solve(..., array);
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39 // while (best_end != nullptr) {
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40 // int cut_index = best_end - array;
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41 // best_end = best_end->best_prev();
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42 // }
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43 // delete [] array;
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44 class DPPoint {
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45 public:
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46 // The cost function evaluates the total cost at this (excluding this's
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47 // local_cost) and if it beats this's total_cost, then
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48 // replace the appropriate values in this.
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49 using CostFunc = int64_t (DPPoint::*)(const DPPoint *);
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51 DPPoint()
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52 : local_cost_(0)
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53 , total_cost_(INT32_MAX)
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54 , total_steps_(1)
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55 , best_prev_(nullptr)
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56 , n_(0)
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57 , sig_x_(0)
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58 , sig_xsq_(0) {}
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60 // Solve the dynamic programming problem for the given array of points, with
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61 // the given size and cost function.
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62 // Steps backwards are limited to being between min_step and max_step
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63 // inclusive.
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64 // The return value is the tail of the best path.
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65 static DPPoint *Solve(int min_step, int max_step, bool debug, CostFunc cost_func, int size,
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66 DPPoint *points);
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67
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68 // A CostFunc that takes the variance of step into account in the cost.
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69 int64_t CostWithVariance(const DPPoint *prev);
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71 // Accessors.
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72 int total_cost() const {
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73 return total_cost_;
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74 }
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75 int Pathlength() const {
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76 return total_steps_;
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77 }
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78 const DPPoint *best_prev() const {
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79 return best_prev_;
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80 }
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81 void AddLocalCost(int new_cost) {
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82 local_cost_ += new_cost;
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83 }
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84
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85 private:
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86 // Code common to different cost functions.
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87
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88 // Update the other members if the cost is lower.
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89 void UpdateIfBetter(int64_t cost, int32_t steps, const DPPoint *prev, int32_t n, int32_t sig_x,
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90 int64_t sig_xsq);
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91
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92 int32_t local_cost_; // Cost of this point on its own.
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93 int32_t total_cost_; // Sum of all costs in best path to here.
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94 // During cost calculations local_cost is excluded.
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95 int32_t total_steps_; // Number of steps in best path to here.
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96 const DPPoint *best_prev_; // Pointer to prev point in best path from here.
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97 // Information for computing the variance part of the cost.
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98 int32_t n_; // Number of steps in best path to here for variance.
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99 int32_t sig_x_; // Sum of step sizes for computing variance.
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100 int64_t sig_xsq_; // Sum of squares of steps for computing variance.
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101 };
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102
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103 } // namespace tesseract.
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104
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105 #endif // TESSERACT_CCSTRUCT_DPPOINT_H_