Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/classify/blobclass.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 ** Filename: blobclass.c
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3 ** Purpose: High level blob classification and training routines.
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4 ** Author: Dan Johnson
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5 **
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6 ** (c) Copyright Hewlett-Packard Company, 1988.
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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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18 #include <cstdio>
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20 #include "classify.h"
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21 #include "featdefs.h"
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22 #include "mf.h"
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23 #include "normfeat.h"
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25 namespace tesseract {
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27 /*---------------------------------------------------------------------------*/
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29 // Extracts features from the given blob and saves them in the tr_file_data_
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30 // member variable.
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31 // fontname: Name of font that this blob was printed in.
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32 // cn_denorm: Character normalization transformation to apply to the blob.
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33 // fx_info: Character normalization parameters computed with cn_denorm.
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34 // blob_text: Ground truth text for the blob.
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35 void Classify::LearnBlob(const std::string &fontname, TBLOB *blob, const DENORM &cn_denorm,
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36 const INT_FX_RESULT_STRUCT &fx_info, const char *blob_text) {
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37 std::unique_ptr<CHAR_DESC_STRUCT> CharDesc(new CHAR_DESC_STRUCT(feature_defs_));
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38 CharDesc->FeatureSets[0] = ExtractMicros(blob, cn_denorm);
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39 CharDesc->FeatureSets[1] = ExtractCharNormFeatures(fx_info);
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40 CharDesc->FeatureSets[2] = ExtractIntCNFeatures(*blob, fx_info);
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41 CharDesc->FeatureSets[3] = ExtractIntGeoFeatures(*blob, fx_info);
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43 if (ValidCharDescription(feature_defs_, CharDesc.get())) {
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44 // Label the features with a class name and font name.
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45 tr_file_data_ += "\n";
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46 tr_file_data_ += fontname;
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47 tr_file_data_ += " ";
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48 tr_file_data_ += blob_text;
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49 tr_file_data_ += "\n";
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51 // write micro-features to file and clean up
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52 WriteCharDescription(feature_defs_, CharDesc.get(), tr_file_data_);
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53 } else {
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54 tprintf("Blob learned was invalid!\n");
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55 }
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56 } // LearnBlob
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58 // Writes stored training data to a .tr file based on the given filename.
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59 // Returns false on error.
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60 bool Classify::WriteTRFile(const char *filename) {
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61 bool result = false;
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62 std::string tr_filename = filename;
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63 tr_filename += ".tr";
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64 FILE *fp = fopen(tr_filename.c_str(), "wb");
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65 if (fp) {
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66 result = tesseract::Serialize(fp, &tr_file_data_[0], tr_file_data_.length());
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67 fclose(fp);
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68 }
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69 tr_file_data_.resize(0);
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70 return result;
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71 }
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73 } // namespace tesseract