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annotate mupdf-source/thirdparty/zxing-cpp/core/src/HybridBinarizer.cpp @ 24:21c6080bc183

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author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 18:19:48 +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 */
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5 // SPDX-License-Identifier: Apache-2.0
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7 #include "HybridBinarizer.h"
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9 #include "BitMatrix.h"
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10 #include "Matrix.h"
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12 #include <algorithm>
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13 #include <cstdint>
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14 #include <fstream>
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15 #include <memory>
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17 #define USE_NEW_ALGORITHM
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19 namespace ZXing {
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21 // This class uses 5x5 blocks to compute local luminance, where each block is 8x8 pixels.
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22 // So this is the smallest dimension in each axis we can accept.
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23 static constexpr int BLOCK_SIZE = 8;
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24 static constexpr int WINDOW_SIZE = BLOCK_SIZE * (1 + 2 * 2);
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25 static constexpr int MIN_DYNAMIC_RANGE = 24;
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27 HybridBinarizer::HybridBinarizer(const ImageView& iv) : GlobalHistogramBinarizer(iv) {}
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29 HybridBinarizer::~HybridBinarizer() = default;
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31 bool HybridBinarizer::getPatternRow(int row, int rotation, PatternRow& res) const
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32 {
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33 #if 1
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34 // This is the original "hybrid" behavior: use GlobalHistogram for the 1D case
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35 return GlobalHistogramBinarizer::getPatternRow(row, rotation, res);
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36 #else
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37 // This is an alternative that can be faster in general and perform better in unevenly lit sitations like
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38 // https://github.com/zxing-cpp/zxing-cpp/blob/master/test/samples/ean13-2/21.png. That said, it fairs
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39 // worse in borderline low resolution situations. With the current black box sample set we'd loose 94
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40 // test cases while gaining 53 others.
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41 auto bits = getBitMatrix();
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42 if (bits)
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43 GetPatternRow(*bits, row, res, rotation % 180 != 0);
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44 return bits != nullptr;
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45 #endif
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46 }
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48 using T_t = uint8_t;
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50 /**
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51 * Applies a single threshold to a block of pixels.
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52 */
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53 static void ThresholdBlock(const uint8_t* __restrict luminances, int xoffset, int yoffset, T_t threshold, int rowStride,
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54 BitMatrix& matrix)
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55 {
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56 for (int y = yoffset; y < yoffset + BLOCK_SIZE; ++y) {
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57 auto* src = luminances + y * rowStride + xoffset;
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58 auto* const dstBegin = matrix.row(y).begin() + xoffset;
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59 // TODO: fix pixelStride > 1 case
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60 for (auto* dst = dstBegin; dst < dstBegin + BLOCK_SIZE; ++dst, ++src)
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61 *dst = (*src <= threshold) * BitMatrix::SET_V;
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62 }
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63 }
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65 #ifndef USE_NEW_ALGORITHM
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67 /**
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68 * Calculates a single black point for each block of pixels and saves it away.
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69 * See the following thread for a discussion of this algorithm:
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70 * http://groups.google.com/group/zxing/browse_thread/thread/d06efa2c35a7ddc0
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71 */
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72 static Matrix<T_t> CalculateBlackPoints(const uint8_t* __restrict luminances, int subWidth, int subHeight, int width, int height,
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73 int rowStride)
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74 {
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75 Matrix<T_t> blackPoints(subWidth, subHeight);
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76
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77 for (int y = 0; y < subHeight; y++) {
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78 int yoffset = std::min(y * BLOCK_SIZE, height - BLOCK_SIZE);
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79 for (int x = 0; x < subWidth; x++) {
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80 int xoffset = std::min(x * BLOCK_SIZE, width - BLOCK_SIZE);
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81 int sum = 0;
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82 uint8_t min = luminances[yoffset * rowStride + xoffset];
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83 uint8_t max = min;
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84 for (int yy = 0, offset = yoffset * rowStride + xoffset; yy < BLOCK_SIZE; yy++, offset += rowStride) {
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85 for (int xx = 0; xx < BLOCK_SIZE; xx++) {
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86 auto pixel = luminances[offset + xx];
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87 sum += pixel;
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88 if (pixel < min)
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89 min = pixel;
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90 if (pixel > max)
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91 max = pixel;
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92 }
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93 // short-circuit min/max tests once dynamic range is met
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94 if (max - min > MIN_DYNAMIC_RANGE) {
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95 // finish the rest of the rows quickly
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96 for (yy++, offset += rowStride; yy < BLOCK_SIZE; yy++, offset += rowStride) {
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97 for (int xx = 0; xx < BLOCK_SIZE; xx++) {
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parents:
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98 sum += luminances[offset + xx];
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99 }
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parents:
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100 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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101 }
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102 }
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103
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104 // The default estimate is the average of the values in the block.
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Franz Glasner <fzglas.hg@dom66.de>
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105 int average = sum / (BLOCK_SIZE * BLOCK_SIZE);
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Franz Glasner <fzglas.hg@dom66.de>
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106 if (max - min <= MIN_DYNAMIC_RANGE) {
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107 // If variation within the block is low, assume this is a block with only light or only
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108 // dark pixels. In that case we do not want to use the average, as it would divide this
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109 // low contrast area into black and white pixels, essentially creating data out of noise.
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110 //
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111 // The default assumption is that the block is light/background. Since no estimate for
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112 // the level of dark pixels exists locally, use half the min for the block.
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113 average = min / 2;
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114
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115 if (y > 0 && x > 0) {
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116 // Correct the "white background" assumption for blocks that have neighbors by comparing
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117 // the pixels in this block to the previously calculated black points. This is based on
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118 // the fact that dark barcode symbology is always surrounded by some amount of light
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119 // background for which reasonable black point estimates were made. The bp estimated at
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120 // the boundaries is used for the interior.
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121
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122 // The (min < bp) is arbitrary but works better than other heuristics that were tried.
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Franz Glasner <fzglas.hg@dom66.de>
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123 int averageNeighborBlackPoint =
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Franz Glasner <fzglas.hg@dom66.de>
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124 (blackPoints(x, y - 1) + (2 * blackPoints(x - 1, y)) + blackPoints(x - 1, y - 1)) / 4;
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Franz Glasner <fzglas.hg@dom66.de>
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125 if (min < averageNeighborBlackPoint) {
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126 average = averageNeighborBlackPoint;
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127 }
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128 }
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129 }
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130 blackPoints(x, y) = average;
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131 }
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132 }
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Franz Glasner <fzglas.hg@dom66.de>
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133 return blackPoints;
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134 }
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135
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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136 /**
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137 * For each block in the image, calculate the average black point using a 5x5 grid
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Franz Glasner <fzglas.hg@dom66.de>
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138 * of the blocks around it. Also handles the corner cases (fractional blocks are computed based
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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139 * on the last pixels in the row/column which are also used in the previous block).
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Franz Glasner <fzglas.hg@dom66.de>
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140 */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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141 static std::shared_ptr<BitMatrix> CalculateMatrix(const uint8_t* __restrict luminances, int subWidth, int subHeight, int width,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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142 int height, int rowStride, const Matrix<T_t>& blackPoints)
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143 {
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144 auto matrix = std::make_shared<BitMatrix>(width, height);
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145
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146 #ifdef PRINT_DEBUG
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147 Matrix<uint8_t> out(width, height);
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parents:
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148 Matrix<uint8_t> out2(width, height);
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149 #endif
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150
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parents:
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151 for (int y = 0; y < subHeight; y++) {
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parents:
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152 int yoffset = std::min(y * BLOCK_SIZE, height - BLOCK_SIZE);
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153 for (int x = 0; x < subWidth; x++) {
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parents:
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154 int xoffset = std::min(x * BLOCK_SIZE, width - BLOCK_SIZE);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
155 int left = std::clamp(x, 2, subWidth - 3);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
156 int top = std::clamp(y, 2, subHeight - 3);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
157 int sum = 0;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
158 for (int dy = -2; dy <= 2; ++dy) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
159 for (int dx = -2; dx <= 2; ++dx) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 sum += blackPoints(left + dx, top + dy);
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parents:
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161 }
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162 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
163 int average = sum / 25;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
164 ThresholdBlock(luminances, xoffset, yoffset, average, rowStride, *matrix);
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165
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parents:
diff changeset
166 #ifdef PRINT_DEBUG
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parents:
diff changeset
167 for (int yy = 0; yy < 8; ++yy)
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parents:
diff changeset
168 for (int xx = 0; xx < 8; ++xx) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
169 out.set(xoffset + xx, yoffset + yy, blackPoints(x, 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
170 out2.set(xoffset + xx, yoffset + yy, average);
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parents:
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171 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
172 #endif
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parents:
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173 }
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parents:
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174 }
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175
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parents:
diff changeset
176 #ifdef PRINT_DEBUG
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 std::ofstream file("thresholds.pnm");
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178 file << "P5\n" << out.width() << ' ' << out.height() << "\n255\n";
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
179 file.write(reinterpret_cast<const char*>(out.data()), out.size());
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parents:
diff changeset
180 std::ofstream file2("thresholds_avg.pnm");
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 file2 << "P5\n" << out.width() << ' ' << out.height() << "\n255\n";
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
182 file2.write(reinterpret_cast<const char*>(out2.data()), out2.size());
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
183 #endif
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parents:
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184
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 return matrix;
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parents:
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186 }
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parents:
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187
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 #else
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parents:
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189
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parents:
diff changeset
190 // Subdivide the image in blocks of BLOCK_SIZE and calculate one treshold value per block as
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 // (max - min > MIN_DYNAMIC_RANGE) ? (max + min) / 2 : 0
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192 static Matrix<T_t> BlockThresholds(const ImageView iv)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
193 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 int subWidth = (iv.width() + BLOCK_SIZE - 1) / BLOCK_SIZE; // ceil(width/BS)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
195 int subHeight = (iv.height() + BLOCK_SIZE - 1) / BLOCK_SIZE; // ceil(height/BS)
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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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
197 Matrix<T_t> thresholds(subWidth, subHeight);
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parents:
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198
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
199 for (int y = 0; y < subHeight; 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
200 int y0 = std::min(y * BLOCK_SIZE, iv.height() - BLOCK_SIZE);
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
201 for (int x = 0; x < subWidth; x++) {
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
202 int x0 = std::min(x * BLOCK_SIZE, iv.width() - BLOCK_SIZE);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
203 uint8_t min = 255;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
204 uint8_t max = 0;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
205 for (int yy = 0; yy < BLOCK_SIZE; yy++) {
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
206 auto line = iv.data(x0, y0 + yy);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
207 for (int xx = 0; xx < BLOCK_SIZE; xx++)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
208 UpdateMinMax(min, max, line[xx]);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
209 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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210
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
211 thresholds(x, y) = (max - min > MIN_DYNAMIC_RANGE) ? (int(max) + min) / 2 : 0;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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212 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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213 }
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parents:
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214
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
215 return thresholds;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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216 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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217
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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218 // Apply gaussian-like smoothing filter over all non-zero thresholds and fill any remainig gaps with nearest neighbor
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
219 static Matrix<T_t> SmoothThresholds(Matrix<T_t>&& in)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
220 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
221 Matrix<T_t> out(in.width(), in.height());
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parents:
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222
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
223 constexpr int R = WINDOW_SIZE / BLOCK_SIZE / 2;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
224 for (int y = 0; y < in.height(); y++) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
225 for (int x = 0; x < in.width(); x++) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
226 int left = std::clamp(x, R, in.width() - R - 1);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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227 int top = std::clamp(y, R, in.height() - R - 1);
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parents:
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228
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
229 int sum = in(x, y) * 2;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
230 int n = (sum > 0) * 2;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
231 auto add = [&](int x, int y) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
232 int t = in(x, y);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
233 sum += t;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
234 n += t > 0;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
235 };
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parents:
diff changeset
236
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
237 for (int dy = -R; dy <= R; ++dy)
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
238 for (int dx = -R; dx <= R; ++dx)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
239 add(left + dx, top + dy);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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240
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
241 out(x, y) = n > 0 ? sum / n : 0;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
242 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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243 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
244
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
245 // flood fill any remaing gaps of (very large) no-contrast regions
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
246 auto last = out.begin() - 1;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
247 for (auto* i = out.begin(); i != out.end(); ++i) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
248 if (*i) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
249 if (last != i - 1)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
250 std::fill(last + 1, i, *i);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
251 last = i;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
252 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
253 }
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
254 std::fill(last + 1, out.end(), *(std::max(last, out.begin())));
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
255
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
256 return out;
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
257 }
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
258
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
259 static std::shared_ptr<BitMatrix> ThresholdImage(const ImageView iv, const Matrix<T_t>& thresholds)
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
260 {
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
261 auto matrix = std::make_shared<BitMatrix>(iv.width(), iv.height());
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
262
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
263 #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
264 Matrix<uint8_t> out(iv.width(), iv.height());
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
265 #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
266
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
267 for (int y = 0; y < thresholds.height(); 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
268 int yoffset = std::min(y * BLOCK_SIZE, iv.height() - BLOCK_SIZE);
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
269 for (int x = 0; x < thresholds.width(); x++) {
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
270 int xoffset = std::min(x * BLOCK_SIZE, iv.width() - BLOCK_SIZE);
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
271 ThresholdBlock(iv.data(), xoffset, yoffset, thresholds(x, y), iv.rowStride(), *matrix);
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
272
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
273 #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
274 for (int yy = 0; yy < 8; ++yy)
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
275 for (int xx = 0; xx < 8; ++xx)
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
276 out.set(xoffset + xx, yoffset + yy, thresholds(x, 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
277 #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
278 }
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
279 }
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
280
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
281 #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
282 std::ofstream file("thresholds_new.pnm");
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
283 file << "P5\n" << out.width() << ' ' << out.height() << "\n255\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
284 file.write(reinterpret_cast<const char*>(out.data()), out.size());
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
285 #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
286
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
287 return matrix;
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
288 }
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
289
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
290 #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
291
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
292 std::shared_ptr<const BitMatrix> HybridBinarizer::getBlackMatrix() const
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
293 {
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
294 if (width() >= WINDOW_SIZE && height() >= WINDOW_SIZE) {
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
295 #ifdef USE_NEW_ALGORITHM
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:
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296 auto thrs = SmoothThresholds(BlockThresholds(_buffer));
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297 return ThresholdImage(_buffer, thrs);
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298 #else
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299 const uint8_t* luminances = _buffer.data();
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300 int subWidth = (width() + BLOCK_SIZE - 1) / BLOCK_SIZE; // ceil(width/BS)
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301 int subHeight = (height() + BLOCK_SIZE - 1) / BLOCK_SIZE; // ceil(height/BS)
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302 auto blackPoints =
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303 CalculateBlackPoints(luminances, subWidth, subHeight, width(), height(), _buffer.rowStride());
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304
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305 return CalculateMatrix(luminances, subWidth, subHeight, width(), height(), _buffer.rowStride(), blackPoints);
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306 #endif
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307 } else {
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308 // If the image is too small, fall back to the global histogram approach.
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309 return GlobalHistogramBinarizer::getBlackMatrix();
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310 }
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311 }
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312
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313 } // ZXing