Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccstruct/dppoint.cpp @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 /**********************************************************************
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2 * File: dppoint.cpp
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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 19:08:01 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 #include "dppoint.h"
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21 #include "errcode.h"
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22 #include "tprintf.h"
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24 namespace tesseract {
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26 // Solve the dynamic programming problem for the given array of points, with
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27 // the given size and cost function.
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28 // Steps backwards are limited to being between min_step and max_step
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29 // inclusive.
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30 // The return value is the tail of the best path.
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31 DPPoint *DPPoint::Solve(int min_step, int max_step, bool debug, CostFunc cost_func, int size,
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32 DPPoint *points) {
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33 if (size <= 0 || max_step < min_step || min_step >= size) {
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34 return nullptr; // Degenerate, but not necessarily an error.
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35 }
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36 ASSERT_HOST(min_step > 0); // Infinite loop possible if this is not true.
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37 if (debug) {
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38 tprintf("min = %d, max=%d\n", min_step, max_step);
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39 }
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40 // Evaluate the total cost at each point.
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41 for (int i = 0; i < size; ++i) {
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42 for (int offset = min_step; offset <= max_step; ++offset) {
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43 DPPoint *prev = offset <= i ? points + i - offset : nullptr;
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44 int64_t new_cost = (points[i].*cost_func)(prev);
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45 if (points[i].best_prev_ != nullptr && offset > min_step * 2 &&
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46 new_cost > points[i].total_cost_) {
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47 break; // Find only the first minimum if going over twice the min.
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48 }
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49 }
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50 points[i].total_cost_ += points[i].local_cost_;
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51 if (debug) {
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52 tprintf("At point %d, local cost=%d, total_cost=%d, steps=%d\n", i, points[i].local_cost_,
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53 points[i].total_cost_, points[i].total_steps_);
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54 }
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55 }
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56 // Now find the end of the best path and return it.
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57 int best_cost = points[size - 1].total_cost_;
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58 int best_end = size - 1;
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59 for (int end = best_end - 1; end >= size - min_step; --end) {
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60 int cost = points[end].total_cost_;
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61 if (cost < best_cost) {
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62 best_cost = cost;
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63 best_end = end;
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64 }
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65 }
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66 return points + best_end;
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67 }
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68
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69 // A CostFunc that takes the variance of step into account in the cost.
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70 int64_t DPPoint::CostWithVariance(const DPPoint *prev) {
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71 if (prev == nullptr || prev == this) {
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72 UpdateIfBetter(0, 1, nullptr, 0, 0, 0);
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73 return 0;
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74 }
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75
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76 int delta = this - prev;
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77 int32_t n = prev->n_ + 1;
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78 int32_t sig_x = prev->sig_x_ + delta;
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79 int64_t sig_xsq = prev->sig_xsq_ + static_cast<int64_t>(delta) * delta;
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80 int64_t cost = (sig_xsq - sig_x * sig_x / n) / n;
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81 cost += prev->total_cost_;
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82 UpdateIfBetter(cost, prev->total_steps_ + 1, prev, n, sig_x, sig_xsq);
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83 return cost;
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84 }
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85
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86 // Update the other members if the cost is lower.
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87 void DPPoint::UpdateIfBetter(int64_t cost, int32_t steps, const DPPoint *prev, int32_t n,
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88 int32_t sig_x, int64_t sig_xsq) {
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89 if (cost < total_cost_) {
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90 total_cost_ = cost;
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91 total_steps_ = steps;
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92 best_prev_ = prev;
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93 n_ = n;
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94 sig_x_ = sig_x;
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95 sig_xsq_ = sig_xsq;
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96 }
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97 }
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:
diff changeset
98
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:
diff changeset
99 } // namespace tesseract.