Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccstruct/otsuthr.h @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: otsuthr.h
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3 // Description: Simple Otsu thresholding for binarizing images.
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4 // Author: Ray Smith
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5 //
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6 // (C) Copyright 2008, Google Inc.
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7 // Licensed under the Apache License, Version 2.0 (the "License");
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8 // you may not use this file except in compliance with the License.
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9 // You may obtain a copy of the License at
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10 // http://www.apache.org/licenses/LICENSE-2.0
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11 // Unless required by applicable law or agreed to in writing, software
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12 // distributed under the License is distributed on an "AS IS" BASIS,
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13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 // See the License for the specific language governing permissions and
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15 // limitations under the License.
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16 //
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17 ///////////////////////////////////////////////////////////////////////
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19 #ifndef TESSERACT_CCMAIN_OTSUTHR_H_
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20 #define TESSERACT_CCMAIN_OTSUTHR_H_
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22 #include "image.h"
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24 #include <vector> // for std::vector
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26 struct Pix;
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28 namespace tesseract {
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30 const int kHistogramSize = 256; // The size of a histogram of pixel values.
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32 // Computes the Otsu threshold(s) for the given image rectangle, making one
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33 // for each channel. Each channel is always one byte per pixel.
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34 // Returns an array of threshold values and an array of hi_values, such
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35 // that a pixel value >threshold[channel] is considered foreground if
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36 // hi_values[channel] is 0 or background if 1. A hi_value of -1 indicates
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37 // that there is no apparent foreground. At least one hi_value will not be -1.
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38 // The return value is the number of channels in the input image, being
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39 // the size of the output thresholds and hi_values arrays.
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40 int OtsuThreshold(Image src_pix, int left, int top, int width, int height,
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41 std::vector<int> &thresholds,
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42 std::vector<int> &hi_values);
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44 // Computes the histogram for the given image rectangle, and the given
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45 // single channel. Each channel is always one byte per pixel.
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46 // Histogram is always a kHistogramSize(256) element array to count
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47 // occurrences of each pixel value.
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48 void HistogramRect(Image src_pix, int channel, int left, int top, int width, int height,
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49 int *histogram);
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51 // Computes the Otsu threshold(s) for the given histogram.
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52 // Also returns H = total count in histogram, and
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53 // omega0 = count of histogram below threshold.
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54 int OtsuStats(const int *histogram, int *H_out, int *omega0_out);
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56 } // namespace tesseract.
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58 #endif // TESSERACT_CCMAIN_OTSUTHR_H_