Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/classify/mf.cpp @ 33:c4daa0c83d64

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 17:55:13 +0200
parents b50eed0cc0ef
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1 /******************************************************************************
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2 ** Filename: mf.c
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3 ** Purpose: Micro-feature interface to flexible feature extractor.
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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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17 /*----------------------------------------------------------------------------
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18 Include Files and Type Defines
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19 ----------------------------------------------------------------------------*/
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20 #include "mf.h"
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21
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22 #include "featdefs.h"
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23 #include "mfdefs.h"
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24 #include "mfx.h"
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26 #include <cmath>
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28 namespace tesseract {
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30 /*----------------------------------------------------------------------------
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31 Private Code
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32 ----------------------------------------------------------------------------*/
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33 /**
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34 * Call the old micro-feature extractor and then copy
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35 * the features into the new format. Then deallocate the
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36 * old micro-features.
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37 * @param Blob blob to extract micro-features from
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38 * @param cn_denorm control parameter to feature extractor.
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39 * @return Micro-features for Blob.
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40 */
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41 FEATURE_SET ExtractMicros(TBLOB *Blob, const DENORM &cn_denorm) {
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42 auto features = BlobMicroFeatures(Blob, cn_denorm);
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43 if (features.empty()) {
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44 return nullptr;
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45 }
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46 int n = 0;
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47 for ([[maybe_unused]] auto &f: features) {
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48 ++n;
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49 }
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50 auto FeatureSet = new FEATURE_SET_STRUCT(n);
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52 for (auto &f : features) {
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53 auto Feature = new FEATURE_STRUCT(&MicroFeatureDesc);
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54 for (int i = 0; i < (int)MicroFeatureParameter::MFCount; ++i)
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55 Feature->Params[i] = f[i];
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56 // Bulge features are deprecated and should not be used. Set to 0.
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57 Feature->Params[(int)MicroFeatureParameter::MFBulge1] = 0.0f;
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58 Feature->Params[(int)MicroFeatureParameter::MFBulge2] = 0.0f;
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59
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60 #ifndef _WIN32
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61 // Assert that feature parameters are well defined.
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62 for (int i = 0; i < Feature->Type->NumParams; i++) {
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63 ASSERT_HOST(!std::isnan(Feature->Params[i]));
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64 }
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65 #endif
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66
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67 AddFeature(FeatureSet, Feature);
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68 }
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69 return FeatureSet;
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70 } /* ExtractMicros */
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72 } // namespace tesseract