tesseract  5.0.0
mf.cpp
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1 /******************************************************************************
2  ** Filename: mf.c
3  ** Purpose: Micro-feature interface to flexible feature extractor.
4  ** Author: Dan Johnson
5  **
6  ** (c) Copyright Hewlett-Packard Company, 1988.
7  ** Licensed under the Apache License, Version 2.0 (the "License");
8  ** you may not use this file except in compliance with the License.
9  ** You may obtain a copy of the License at
10  ** http://www.apache.org/licenses/LICENSE-2.0
11  ** Unless required by applicable law or agreed to in writing, software
12  ** distributed under the License is distributed on an "AS IS" BASIS,
13  ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  ** See the License for the specific language governing permissions and
15  ** limitations under the License.
16  ******************************************************************************/
17 /*----------------------------------------------------------------------------
18  Include Files and Type Defines
19 ----------------------------------------------------------------------------*/
20 #include "mf.h"
21 
22 #include "featdefs.h"
23 #include "mfdefs.h"
24 #include "mfx.h"
25 
26 #include <cmath>
27 
28 namespace tesseract {
29 
30 /*----------------------------------------------------------------------------
31  Private Code
32 ----------------------------------------------------------------------------*/
41 FEATURE_SET ExtractMicros(TBLOB *Blob, const DENORM &cn_denorm) {
42  auto features = BlobMicroFeatures(Blob, cn_denorm);
43  if (features.empty()) {
44  return nullptr;
45  }
46  int n = 0;
47  for ([[maybe_unused]] auto &f: features) {
48  ++n;
49  }
50  auto FeatureSet = new FEATURE_SET_STRUCT(n);
51 
52  for (auto &f : features) {
53  auto Feature = new FEATURE_STRUCT(&MicroFeatureDesc);
54  for (int i = 0; i < (int)MicroFeatureParameter::MFCount; ++i)
55  Feature->Params[i] = f[i];
56  // Bulge features are deprecated and should not be used. Set to 0.
57  Feature->Params[(int)MicroFeatureParameter::MFBulge1] = 0.0f;
58  Feature->Params[(int)MicroFeatureParameter::MFBulge2] = 0.0f;
59 
60 #ifndef _WIN32
61  // Assert that feature parameters are well defined.
62  for (int i = 0; i < Feature->Type->NumParams; i++) {
63  ASSERT_HOST(!std::isnan(Feature->Params[i]));
64  }
65 #endif
66 
67  AddFeature(FeatureSet, Feature);
68  }
69  return FeatureSet;
70 } /* ExtractMicros */
71 
72 } // namespace tesseract
#define ASSERT_HOST(x)
Definition: errcode.h:59
MICROFEATURES BlobMicroFeatures(TBLOB *Blob, const DENORM &cn_denorm)
Definition: mfx.cpp:54
FEATURE_SET ExtractMicros(TBLOB *Blob, const DENORM &cn_denorm)
Definition: mf.cpp:41
bool AddFeature(FEATURE_SET FeatureSet, FEATURE Feature)
Definition: ocrfeatures.cpp:39
const FEATURE_DESC_STRUCT MicroFeatureDesc