Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/ConcentricFinder.h @ 7:5ab937c03c27

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Apply full RELRO to all generated binaries. Also strip the generated binaries.
author Franz Glasner <fzglas.hg@dom66.de>
date Tue, 16 Sep 2025 12:37:32 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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13 #include <optional>
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15 namespace ZXing {
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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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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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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