Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/ConcentricFinder.h @ 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 * Copyright 2020 Axel Waggershauser
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3 */
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4 // SPDX-License-Identifier: Apache-2.0
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5
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6 #pragma once
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7
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8 #include "BitMatrixCursor.h"
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9 #include "Pattern.h"
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10 #include "Quadrilateral.h"
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11 #include "ZXAlgorithms.h"
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12
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13 #include <optional>
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14
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15 namespace ZXing {
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16
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17 template <typename T, size_t N>
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18 static float CenterFromEnd(const std::array<T, N>& pattern, float end)
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19 {
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20 if (N == 5) {
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21 float a = pattern[4] + pattern[3] + pattern[2] / 2.f;
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22 float b = pattern[4] + (pattern[3] + pattern[2] + pattern[1]) / 2.f;
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23 float c = (pattern[4] + pattern[3] + pattern[2] + pattern[1] + pattern[0]) / 2.f;
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24 return end - (2 * a + b + c) / 4;
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25 } else if (N == 3) {
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26 float a = pattern[2] + pattern[1] / 2.f;
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27 float b = (pattern[2] + pattern[1] + pattern[0]) / 2.f;
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28 return end - (2 * a + b) / 3;
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29 } else { // aztec
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30 auto a = Reduce(pattern.begin() + (N/2 + 1), pattern.end(), pattern[N/2] / 2.f);
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31 return end - a;
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32 }
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33 }
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34
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35 template<int N, typename Cursor>
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36 std::optional<Pattern<N>> ReadSymmetricPattern(Cursor& cur, int range)
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37 {
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38 static_assert(N % 2 == 1);
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39 assert(range > 0);
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40 Pattern<N> res = {};
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41 auto constexpr s_2 = Size(res)/2;
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42 auto cuo = cur.turnedBack();
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43
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44 auto next = [&](auto& cur, int i) {
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45 auto v = cur.stepToEdge(1, range);
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46 res[s_2 + i] += v;
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47 if (range)
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48 range -= v;
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49 return v;
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50 };
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51
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52 for (int i = 0; i <= s_2; ++i) {
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53 if (!next(cur, i) || !next(cuo, -i))
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54 return {};
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55 }
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56 res[s_2]--; // the starting pixel has been counted twice, fix this
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57
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58 return res;
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59 }
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61 template<bool RELAXED_THRESHOLD = false, typename PATTERN>
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62 int CheckSymmetricPattern(BitMatrixCursorI& cur, PATTERN pattern, int range, bool updatePosition)
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63 {
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64 FastEdgeToEdgeCounter curFwd(cur), curBwd(cur.turnedBack());
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65
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66 int centerFwd = curFwd.stepToNextEdge(range);
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67 if (!centerFwd)
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68 return 0;
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69 int centerBwd = curBwd.stepToNextEdge(range);
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70 if (!centerBwd)
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71 return 0;
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72
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73 assert(range > 0);
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74 Pattern<pattern.size()> res = {};
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75 auto constexpr s_2 = Size(res)/2;
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76 res[s_2] = centerFwd + centerBwd - 1; // -1 because the starting pixel is counted twice
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77 range -= res[s_2];
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78
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79 auto next = [&](auto& cur, int i) {
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80 auto v = cur.stepToNextEdge(range);
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81 res[s_2 + i] = v;
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82 range -= v;
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83 return v;
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84 };
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85
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86 for (int i = 1; i <= s_2; ++i) {
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87 if (!next(curFwd, i) || !next(curBwd, -i))
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88 return 0;
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89 }
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90
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91 if (!IsPattern<RELAXED_THRESHOLD>(res, pattern))
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92 return 0;
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93
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94 if (updatePosition)
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95 cur.step(res[s_2] / 2 - (centerBwd - 1));
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97 return Reduce(res);
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98 }
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99
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100 std::optional<PointF> CenterOfRing(const BitMatrix& image, PointI center, int range, int nth, bool requireCircle = true);
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101
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102 std::optional<PointF> FinetuneConcentricPatternCenter(const BitMatrix& image, PointF center, int range, int finderPatternSize);
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103
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104 std::optional<QuadrilateralF> FindConcentricPatternCorners(const BitMatrix& image, PointF center, int range, int ringIndex);
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105
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106 struct ConcentricPattern : public PointF
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107 {
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108 int size = 0;
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109 };
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110
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111 template <bool E2E = false, typename PATTERN>
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112 std::optional<ConcentricPattern> LocateConcentricPattern(const BitMatrix& image, PATTERN pattern, PointF center, int range)
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113 {
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114 auto cur = BitMatrixCursor(image, PointI(center), {});
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115 int minSpread = image.width(), maxSpread = 0;
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116 // TODO: setting maxError to 1 can subtantially help with detecting symbols with low print quality resulting in damaged
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117 // finder patterns, but it sutantially increases the runtime (approx. 20% slower for the falsepositive images).
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118 int maxError = 0;
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119 for (auto d : {PointI{0, 1}, {1, 0}}) {
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120 int spread = CheckSymmetricPattern<E2E>(cur.setDirection(d), pattern, range, true);
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121 if (spread)
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122 UpdateMinMax(minSpread, maxSpread, spread);
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123 else if (--maxError < 0)
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124 return {};
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125 }
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126
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127 #if 1
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128 for (auto d : {PointI{1, 1}, {1, -1}}) {
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129 int spread = CheckSymmetricPattern<true>(cur.setDirection(d), pattern, range * 2, false);
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130 if (spread)
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131 UpdateMinMax(minSpread, maxSpread, spread);
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132 else if (--maxError < 0)
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133 return {};
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134 }
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135 #endif
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136
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137 if (maxSpread > 5 * minSpread)
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138 return {};
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139
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140 auto newCenter = FinetuneConcentricPatternCenter(image, PointF(cur.p), range, pattern.size());
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141 if (!newCenter)
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142 return {};
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143
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144 return ConcentricPattern{*newCenter, (maxSpread + minSpread) / 2};
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145 }
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146
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147 } // ZXing
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148