Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/HybridBinarizer.h @ 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 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 #pragma once
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9 #include "GlobalHistogramBinarizer.h"
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11 namespace ZXing {
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13 /**
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14 * This class implements a local thresholding algorithm, which while slower than the
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15 * GlobalHistogramBinarizer, is fairly efficient for what it does. It is designed for
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16 * high frequency images of barcodes with black data on white backgrounds. For this application,
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17 * it does a much better job than a global blackpoint with severe shadows and gradients.
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18 * However it tends to produce artifacts on lower frequency images and is therefore not
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19 * a good general purpose binarizer for uses outside ZXing.
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20 *
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21 * This class extends GlobalHistogramBinarizer, using the older histogram approach for 1D readers,
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22 * and the newer local approach for 2D readers. 1D decoding using a per-row histogram is already
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23 * inherently local, and only fails for horizontal gradients. We can revisit that problem later,
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24 * but for now it was not a win to use local blocks for 1D.
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25 *
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26 * This Binarizer is the default for the unit tests and the recommended class for library users.
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27 *
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28 * @author dswitkin@google.com (Daniel Switkin)
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29 */
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30 class HybridBinarizer : public GlobalHistogramBinarizer
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31 {
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32 public:
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33 explicit HybridBinarizer(const ImageView& iv);
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34 ~HybridBinarizer() override;
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36 bool getPatternRow(int row, int rotation, PatternRow &res) const override;
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37 std::shared_ptr<const BitMatrix> getBlackMatrix() const override;
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38 };
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40 } // ZXing