Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/GridSampler.cpp @ 22:d77477b4e151

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Let _int_rc() also handle (i.e. ignore) a local version suffix
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 12:05:57 +0200
parents b50eed0cc0ef
children
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1 /*
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2 * Copyright 2016 Nu-book Inc.
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3 * Copyright 2016 ZXing authors
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4 * Copyright 2020 Axel Waggershauser
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5 */
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6 // SPDX-License-Identifier: Apache-2.0
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8 #include "GridSampler.h"
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10 #ifdef PRINT_DEBUG
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11 #include "LogMatrix.h"
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12 #include "BitMatrixIO.h"
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13 #endif
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15 namespace ZXing {
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17 #ifdef PRINT_DEBUG
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18 LogMatrix log;
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19 #endif
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21 DetectorResult SampleGrid(const BitMatrix& image, int width, int height, const PerspectiveTransform& mod2Pix)
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22 {
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23 return SampleGrid(image, width, height, {ROI{0, width, 0, height, mod2Pix}});
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24 }
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26 DetectorResult SampleGrid(const BitMatrix& image, int width, int height, const ROIs& rois)
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27 {
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28 #ifdef PRINT_DEBUG
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29 LogMatrix log;
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30 static int i = 0;
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31 LogMatrixWriter lmw(log, image, 5, "grid" + std::to_string(i++) + ".pnm");
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32 #endif
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33 if (width <= 0 || height <= 0)
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34 return {};
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35
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36 for (auto&& [x0, x1, y0, y1, mod2Pix] : rois) {
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37 // Precheck the corners of every roi to bail out early if the grid is "obviously" not completely inside the image
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38 auto isInside = [&mod2Pix = mod2Pix, &image](int x, int y) { return image.isIn(mod2Pix(centered(PointI(x, y)))); };
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39 if (!mod2Pix.isValid() || !isInside(x0, y0) || !isInside(x1 - 1, y0) || !isInside(x1 - 1, y1 - 1) || !isInside(x0, y1 - 1))
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40 return {};
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41 }
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42
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43 BitMatrix res(width, height);
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44 for (auto&& [x0, x1, y0, y1, mod2Pix] : rois) {
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45 for (int y = y0; y < y1; ++y)
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46 for (int x = x0; x < x1; ++x) {
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47 auto p = mod2Pix(centered(PointI{x, y}));
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48 // Due to a "numerical instability" in the PerspectiveTransform generation/application it has been observed
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49 // that even though all boundary grid points get projected inside the image, it can still happen that an
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50 // inner grid points is not. See #563. A true perspective transformation cannot have this property.
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51 // The following check takes 100% care of the issue and turned out to be less of a performance impact than feared.
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52 // TODO: Check some mathematical/numercial property of mod2Pix to determine if it is a perspective transforation.
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53 if (!image.isIn(p))
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54 return {};
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55
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56 #ifdef PRINT_DEBUG
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57 log(p, 3);
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58 #endif
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59 #if 0
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60 int sum = 0;
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61 for (int dy = -1; dy <= 1; ++dy)
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62 for (int dx = -1; dx <= 1; ++dx)
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63 sum += image.get(p + PointF(dx, dy));
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64 if (sum >= 5)
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65 #else
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66 if (image.get(p))
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67 #endif
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68 res.set(x, y);
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69 }
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70 }
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71
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72 #ifdef PRINT_DEBUG
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73 printf("width: %d, height: %d\n", width, height);
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74 // printf("%s", ToString(res).c_str());
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75 #endif
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76
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77 auto projectCorner = [&](PointI p) {
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78 for (auto&& [x0, x1, y0, y1, mod2Pix] : rois)
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79 if (x0 <= p.x && p.x <= x1 && y0 <= p.y && p.y <= y1)
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80 return PointI(mod2Pix(PointF(p)) + PointF(0.5, 0.5));
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81
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82 return PointI();
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83 };
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84
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85 return {std::move(res),
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86 {projectCorner({0, 0}), projectCorner({width, 0}), projectCorner({width, height}), projectCorner({0, height})}};
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87 }
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88
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89 } // ZXing