Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/ConcentricFinder.cpp @ 21:2f43e400f144

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Provide an "all" target to build both the sdist and the wheel
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 10:28:53 +0200
parents b50eed0cc0ef
children
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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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6 #include "ConcentricFinder.h"
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7
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8 #include "LogMatrix.h"
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9 #include "RegressionLine.h"
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10 #include "ZXAlgorithms.h"
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12 namespace ZXing {
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13
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14 std::optional<PointF> AverageEdgePixels(BitMatrixCursorI cur, int range, int numOfEdges)
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15 {
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16 PointF sum = {};
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17 for (int i = 0; i < numOfEdges; ++i) {
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18 if (!cur.isIn())
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19 return {};
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20 cur.stepToEdge(1, range);
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21 sum += centered(cur.p) + centered(cur.p + cur.back());
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22 log(cur.p + cur.back(), 2);
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23 }
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24 return sum / (2 * numOfEdges);
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25 }
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26
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27 std::optional<PointF> CenterOfDoubleCross(const BitMatrix& image, PointI center, int range, int numOfEdges)
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28 {
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29 PointF sum = {};
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30 for (auto d : {PointI{0, 1}, {1, 0}, {1, 1}, {1, -1}}) {
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31 auto avr1 = AverageEdgePixels({image, center, d}, range, numOfEdges);
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32 auto avr2 = AverageEdgePixels({image, center, -d}, range, numOfEdges);
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33 if (!avr1 || !avr2)
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34 return {};
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35 sum += *avr1 + *avr2;
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36 }
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37 return sum / 8;
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38 }
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39
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40 std::optional<PointF> CenterOfRing(const BitMatrix& image, PointI center, int range, int nth, bool requireCircle)
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41 {
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42 #if 0
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43 if (requireCircle) {
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44 // alternative implementation with the aim of discarding closed loops that are not all circle like (M > 5*m)
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45 auto points = CollectRingPoints(image, center, range, std::abs(nth), nth < 0);
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46 if (points.empty())
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47 return {};
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48 auto res = Reduce(points, PointF{}, std::plus{}) / Size(points);
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49
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50 double m = range, M = 0;
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51 for (auto p : points)
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52 UpdateMinMax(m, M, maxAbsComponent(p - res));
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53
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54 if (M > 5 * m)
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55 return {};
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56
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57 return res;
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58 }
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59 #endif
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60 // range is the approximate width/height of the nth ring, if nth>1 then it would be plausible to limit the search radius
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61 // to approximately range / 2 * sqrt(2) == range * 0.75 but it turned out to be too limiting with realworld/noisy data.
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62 int radius = range;
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63 bool inner = nth < 0;
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64 nth = std::abs(nth);
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65 log(center, 3);
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66 BitMatrixCursorI cur(image, center, {0, 1});
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67 if (!cur.stepToEdge(nth, radius, inner))
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68 return {};
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69 cur.turnRight(); // move clock wise and keep edge on the right/left depending on backup
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70 const auto edgeDir = inner ? Direction::LEFT : Direction::RIGHT;
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71
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72 uint32_t neighbourMask = 0;
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73 auto start = cur.p;
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74 PointF sum = {};
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75 int n = 0;
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76 do {
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77 log(cur.p, 4);
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78 sum += centered(cur.p);
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79 ++n;
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80
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81 // find out if we come full circle around the center. 8 bits have to be set in the end.
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82 neighbourMask |= (1 << (4 + dot(bresenhamDirection(cur.p - center), PointI(1, 3))));
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83
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84 if (!cur.stepAlongEdge(edgeDir))
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85 return {};
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86
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87 // use L-inf norm, simply because it is a lot faster than L2-norm and sufficiently accurate
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88 if (maxAbsComponent(cur.p - center) > radius || center == cur.p || n > 4 * 2 * range)
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89 return {};
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90 } while (cur.p != start);
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91
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92 if (requireCircle && neighbourMask != 0b111101111)
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93 return {};
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94
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95 return sum / n;
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96 }
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97
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98 std::optional<PointF> CenterOfRings(const BitMatrix& image, PointF center, int range, int numOfRings)
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99 {
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
100 int n = 1;
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
101 PointF sum = center;
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
102 for (int i = 2; i < numOfRings + 1; ++i) {
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
103 auto c = CenterOfRing(image, PointI(center), range, i);
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
104 if (!c) {
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
105 if (n == 1)
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
106 return {};
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
107 else
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
108 return sum / n;
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
109 } else if (distance(*c, center) > range / numOfRings / 2) {
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
110 return {};
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
111 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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112
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
113 sum += *c;
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
114 n++;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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115 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
116 return sum / n;
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
117 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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118
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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119 static std::vector<PointF> CollectRingPoints(const BitMatrix& image, PointF center, int range, int edgeIndex, bool backup)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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120 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
121 PointI centerI(center);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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122 int radius = range;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
123 BitMatrixCursorI cur(image, centerI, {0, 1});
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
124 if (!cur.stepToEdge(edgeIndex, radius, backup))
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
125 return {};
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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126 cur.turnRight(); // move clock wise and keep edge on the right/left depending on backup
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
127 const auto edgeDir = backup ? Direction::LEFT : Direction::RIGHT;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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128
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
129 uint32_t neighbourMask = 0;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
130 auto start = cur.p;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
131 std::vector<PointF> points;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
132 points.reserve(4 * range);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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133
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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134 do {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
135 log(cur.p, 4);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
136 points.push_back(centered(cur.p));
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
137
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
138 // find out if we come full circle around the center. 8 bits have to be set in the end.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
139 neighbourMask |= (1 << (4 + dot(bresenhamDirection(cur.p - centerI), PointI(1, 3))));
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
140
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
141 if (!cur.stepAlongEdge(edgeDir))
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
142 return {};
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
143
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
144 // use L-inf norm, simply because it is a lot faster than L2-norm and sufficiently accurate
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
145 if (maxAbsComponent(cur.p - centerI) > radius || centerI == cur.p || Size(points) > 4 * 2 * range)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
146 return {};
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
147
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
148 } while (cur.p != start);
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
149
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
150 if (neighbourMask != 0b111101111)
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
151 return {};
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
152
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
153 return points;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
154 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
155
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
156 static std::optional<QuadrilateralF> FitQadrilateralToPoints(PointF center, std::vector<PointF>& points)
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
157 {
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
158 auto dist2Center = [c = center](auto a, auto b) { return distance(a, c) < distance(b, c); };
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
159 // rotate points such that the first one is the furthest away from the center (hence, a corner)
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
160 std::rotate(points.begin(), std::max_element(points.begin(), points.end(), dist2Center), points.end());
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
161
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162 std::array<const PointF*, 4> corners;
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
163 corners[0] = &points[0];
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
164 // find the oposite corner by looking for the farthest point near the oposite point
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
165 corners[2] = std::max_element(&points[Size(points) * 3 / 8], &points[Size(points) * 5 / 8], dist2Center);
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
166
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 // find the two in between corners by looking for the points farthest from the long diagonal
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
168 auto dist2Diagonal = [l = RegressionLine(*corners[0], *corners[2])](auto a, auto b) { return l.distance(a) < l.distance(b); };
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
169 corners[1] = std::max_element(&points[Size(points) * 1 / 8], &points[Size(points) * 3 / 8], dist2Diagonal);
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
170 corners[3] = std::max_element(&points[Size(points) * 5 / 8], &points[Size(points) * 7 / 8], dist2Diagonal);
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
171
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
172 std::array lines{RegressionLine{corners[0] + 1, corners[1]}, RegressionLine{corners[1] + 1, corners[2]},
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
173 RegressionLine{corners[2] + 1, corners[3]}, RegressionLine{corners[3] + 1, &points.back() + 1}};
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
174
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 if (std::any_of(lines.begin(), lines.end(), [](auto line) { return !line.isValid(); }))
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
176 return {};
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
177
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178 std::array<const PointF*, 4> beg = {corners[0] + 1, corners[1] + 1, corners[2] + 1, corners[3] + 1};
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
179 std::array<const PointF*, 4> end = {corners[1], corners[2], corners[3], &points.back() + 1};
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
180
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 // check if all points belonging to each line segment are sufficiently close to that line
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
182 for (int i = 0; i < 4; ++i)
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
183 for (const PointF* p = beg[i]; p != end[i]; ++p) {
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
184 auto len = std::distance(beg[i], end[i]);
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
185 if (len > 3 && lines[i].distance(*p) > std::max(1., std::min(8., len / 8.))) {
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
186 #ifdef PRINT_DEBUG
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
187 printf("%d: %.2f > %.2f @ %.fx%.f\n", i, lines[i].distance(*p), std::distance(beg[i], end[i]) / 1., p->x, p->y);
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
188 #endif
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
189 return {};
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
190 }
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
191 }
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
192
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
193 QuadrilateralF res;
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
194 for (int i = 0; i < 4; ++i)
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
195 res[i] = intersect(lines[i], lines[(i + 1) % 4]);
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
196
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197 return res;
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198 }
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199
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200 static bool QuadrilateralIsPlausibleSquare(const QuadrilateralF q, int lineIndex)
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201 {
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Franz Glasner <fzglas.hg@dom66.de>
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202 double m, M;
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203 m = M = distance(q[0], q[3]);
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204 for (int i = 1; i < 4; ++i)
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parents:
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205 UpdateMinMax(m, M, distance(q[i - 1], q[i]));
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206
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207 return m >= lineIndex * 2 && m > M / 3;
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208 }
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209
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210 static std::optional<QuadrilateralF> FitSquareToPoints(const BitMatrix& image, PointF center, int range, int lineIndex, bool backup)
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211 {
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Franz Glasner <fzglas.hg@dom66.de>
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212 auto points = CollectRingPoints(image, center, range, lineIndex, backup);
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213 if (points.empty())
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214 return {};
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215
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216 auto res = FitQadrilateralToPoints(center, points);
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217 if (!res || !QuadrilateralIsPlausibleSquare(*res, lineIndex - backup))
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218 return {};
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219
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220 return res;
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221 }
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222
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223 std::optional<QuadrilateralF> FindConcentricPatternCorners(const BitMatrix& image, PointF center, int range, int lineIndex)
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parents:
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224 {
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parents:
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225 auto innerCorners = FitSquareToPoints(image, center, range, lineIndex, false);
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226 if (!innerCorners)
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227 return {};
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228
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229 auto outerCorners = FitSquareToPoints(image, center, range, lineIndex + 1, true);
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230 if (!outerCorners)
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parents:
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231 return {};
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232
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parents:
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233 auto res = Blend(*innerCorners, *outerCorners);
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234
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235 for (auto p : *innerCorners)
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parents:
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236 log(p, 3);
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parents:
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237
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parents:
diff changeset
238 for (auto p : *outerCorners)
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parents:
diff changeset
239 log(p, 3);
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parents:
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240
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parents:
diff changeset
241 for (auto p : res)
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parents:
diff changeset
242 log(p, 3);
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parents:
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243
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parents:
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244 return res;
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parents:
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245 }
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parents:
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246
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parents:
diff changeset
247 std::optional<PointF> FinetuneConcentricPatternCenter(const BitMatrix& image, PointF center, int range, int finderPatternSize)
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parents:
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248 {
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parents:
diff changeset
249 // make sure we have at least one path of white around the center
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
250 if (auto res1 = CenterOfRing(image, PointI(center), range, 1); res1 && image.get(*res1)) {
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parents:
diff changeset
251 // and then either at least one more ring around that
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parents:
diff changeset
252 if (auto res2 = CenterOfRings(image, *res1, range, finderPatternSize / 2); res2 && image.get(*res2))
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
253 return res2;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
254 // or the center can be approximated by a square
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parents:
diff changeset
255 if (FitSquareToPoints(image, *res1, range, 1, false))
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
256 return res1;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
257 // TODO: this is currently only keeping #258 alive, evaluate if still worth it
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
258 if (auto res2 = CenterOfDoubleCross(image, PointI(*res1), range, finderPatternSize / 2 + 1); res2 && image.get(*res2))
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
259 return res2;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
260 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
261 return {};
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
262 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
263
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
264 } // ZXing