githubmirror/tesseract

src/classify/featdefs.cpp
213 строк9 KB
Stefan Weil
Replace malloc / free by new / delete for CHAR_DESC_STRUCT
27 мар 2021, 20:43
27 мар 2021, 20:43aa8dda8
/******************************************************************************
 ** Filename:    featdefs.cpp
 ** Purpose:     Definitions of currently defined feature types.
 ** Author:      Dan Johnson
 **
 ** (c) Copyright Hewlett-Packard Company, 1988.
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
 ** You may obtain a copy of the License at
 ** http://www.apache.org/licenses/LICENSE-2.0
 ** Unless required by applicable law or agreed to in writing, software
 ** distributed under the License is distributed on an "AS IS" BASIS,
 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 ** See the License for the specific language governing permissions and
 ** limitations under the License.
 ******************************************************************************/

#include "featdefs.h"

#include "picofeat.h" // for PicoFeatureLength
#include "scanutils.h"

#include <cstdio>
#include <cstring>

namespace tesseract {

#define PICO_FEATURE_LENGTH 0.05

/*-----------------------------------------------------------------------------
        Global Data Definitions and Declarations
-----------------------------------------------------------------------------*/
const char *const kMicroFeatureType = "mf";
const char *const kCNFeatureType = "cn";
const char *const kIntFeatureType = "if";
const char *const kGeoFeatureType = "tb";

// Define all of the parameters for the MicroFeature type.
StartParamDesc(MicroFeatureParams) DefineParam(0, 0, -0.5, 0.5) DefineParam(0, 0, -0.25, 0.75)
    DefineParam(0, 1, 0.0, 1.0) DefineParam(1, 0, 0.0, 1.0) DefineParam(0, 1, -0.5, 0.5)
        DefineParam(0, 1, -0.5, 0.5) EndParamDesc
    // Now define the feature type itself (see features.h for parameters).
    DefineFeature(MicroFeatureDesc, 5, 1, kMicroFeatureType, MicroFeatureParams)

    // Define all of the parameters for the NormFeat type.
    StartParamDesc(CharNormParams) DefineParam(0, 0, -0.25, 0.75) DefineParam(0, 1, 0.0, 1.0)
        DefineParam(0, 0, 0.0, 1.0) DefineParam(0, 0, 0.0, 1.0) EndParamDesc
    // Now define the feature type itself (see features.h for parameters).
    DefineFeature(CharNormDesc, 4, 0, kCNFeatureType, CharNormParams)

    // Define all of the parameters for the IntFeature type
    StartParamDesc(IntFeatParams) DefineParam(0, 0, 0.0, 255.0) DefineParam(0, 0, 0.0, 255.0)
        DefineParam(1, 0, 0.0, 255.0) EndParamDesc
    // Now define the feature type itself (see features.h for parameters).
    DefineFeature(IntFeatDesc, 2, 1, kIntFeatureType, IntFeatParams)

    // Define all of the parameters for the GeoFeature type
    StartParamDesc(GeoFeatParams) DefineParam(0, 0, 0.0, 255.0) DefineParam(0, 0, 0.0, 255.0)
        DefineParam(0, 0, 0.0, 255.0) EndParamDesc
    // Now define the feature type itself (see features.h for parameters).
    DefineFeature(GeoFeatDesc, 3, 0, kGeoFeatureType, GeoFeatParams)

    // Other features used for training the adaptive classifier, but not used
    // during normal training, therefore not in the DescDefs array.

    // Define all of the parameters for the PicoFeature type
    // define knob that can be used to adjust pico-feature length.
    float PicoFeatureLength = PICO_FEATURE_LENGTH;
StartParamDesc(PicoFeatParams) DefineParam(0, 0, -0.25, 0.75) DefineParam(1, 0, 0.0, 1.0)
    DefineParam(0, 0, -0.5, 0.5) EndParamDesc
    // Now define the feature type itself (see features.h for parameters).
    DefineFeature(PicoFeatDesc, 2, 1, "pf", PicoFeatParams)

    // Define all of the parameters for the OutlineFeature type.
    StartParamDesc(OutlineFeatParams) DefineParam(0, 0, -0.5, 0.5) DefineParam(0, 0, -0.25, 0.75)
        DefineParam(0, 0, 0.0, 1.0) DefineParam(1, 0, 0.0, 1.0) EndParamDesc
    // Now define the feature type itself (see features.h for parameters).
    DefineFeature(OutlineFeatDesc, 3, 1, "of", OutlineFeatParams)

    // MUST be kept in-sync with ExtractorDefs in fxdefs.cpp.
    static const FEATURE_DESC_STRUCT *DescDefs[NUM_FEATURE_TYPES] = {
        &MicroFeatureDesc, &CharNormDesc, &IntFeatDesc, &GeoFeatDesc};

/*-----------------------------------------------------------------------------
              Public Code
-----------------------------------------------------------------------------*/
void InitFeatureDefs(FEATURE_DEFS_STRUCT *featuredefs) {
  featuredefs->NumFeatureTypes = NUM_FEATURE_TYPES;
  for (int i = 0; i < NUM_FEATURE_TYPES; ++i) {
    featuredefs->FeatureDesc[i] = DescDefs[i];
  }
}

/*---------------------------------------------------------------------------*/
/**
 * Appends a textual representation of CharDesc to str.
 * The format used is to write out the number of feature
 * sets which will be written followed by a representation of
 * each feature set.
 *
 * Each set starts with the short name for that feature followed
 * by a description of the feature set.  Feature sets which are
 * not present are not written.
 *
 * @param FeatureDefs    definitions of feature types/extractors
 * @param str            string to append CharDesc to
 * @param CharDesc       character description to write to File
 */
void WriteCharDescription(const FEATURE_DEFS_STRUCT &FeatureDefs, CHAR_DESC_STRUCT *CharDesc, std::string &str) {
  int NumSetsToWrite = 0;

  for (size_t Type = 0; Type < CharDesc->NumFeatureSets; Type++) {
    if (CharDesc->FeatureSets[Type]) {
      NumSetsToWrite++;
    }
  }

  str += " " + std::to_string(NumSetsToWrite);
  str += "\n";
  for (size_t Type = 0; Type < CharDesc->NumFeatureSets; Type++) {
    if (CharDesc->FeatureSets[Type]) {
      str += FeatureDefs.FeatureDesc[Type]->ShortName;
      str += " ";
      WriteFeatureSet(CharDesc->FeatureSets[Type], str);
    }
  }
} /* WriteCharDescription */

// Return whether all of the fields of the given feature set
// are well defined (not inf or nan).
bool ValidCharDescription(const FEATURE_DEFS_STRUCT &FeatureDefs, CHAR_DESC_STRUCT *CharDesc) {
  bool anything_written = false;
  bool well_formed = true;
  for (size_t Type = 0; Type < CharDesc->NumFeatureSets; Type++) {
    if (CharDesc->FeatureSets[Type]) {
      for (int i = 0; i < CharDesc->FeatureSets[Type]->NumFeatures; i++) {
        FEATURE feat = CharDesc->FeatureSets[Type]->Features[i];
        for (int p = 0; p < feat->Type->NumParams; p++) {
          if (std::isnan(feat->Params[p]) || std::isinf(feat->Params[p])) {
            well_formed = false;
          } else {
            anything_written = true;
          }
        }
      }
    } else {
      return false;
    }
  }
  return anything_written && well_formed;
} /* ValidCharDescription */

/*---------------------------------------------------------------------------*/
/**
 * Read a character description from File, and return
 * a data structure containing this information.  The data
 * is formatted as follows:
 * @verbatim
     NumberOfSets
             ShortNameForSet1 Set1
             ShortNameForSet2 Set2
             ...
   @endverbatim
 *
 * Globals:
 * - none
 *
 * @param FeatureDefs    definitions of feature types/extractors
 * @param File open text file to read character description from
 * @return Character description read from File.
 */
CHAR_DESC_STRUCT *ReadCharDescription(const FEATURE_DEFS_STRUCT &FeatureDefs, FILE *File) {
  int NumSetsToRead;
  char ShortName[FEAT_NAME_SIZE];
  int Type;

  ASSERT_HOST(tfscanf(File, "%d", &NumSetsToRead) == 1);
  ASSERT_HOST(NumSetsToRead >= 0);
  ASSERT_HOST(NumSetsToRead <= FeatureDefs.NumFeatureTypes);

  auto CharDesc = new CHAR_DESC_STRUCT(FeatureDefs);
  for (; NumSetsToRead > 0; NumSetsToRead--) {
    tfscanf(File, "%s", ShortName);
    Type = ShortNameToFeatureType(FeatureDefs, ShortName);
    CharDesc->FeatureSets[Type] = ReadFeatureSet(File, FeatureDefs.FeatureDesc[Type]);
  }
  return CharDesc;
}

/*---------------------------------------------------------------------------*/
/**
 * Search through all features currently defined and return
 * the feature type for the feature with the specified short
 * name.  Trap an error if the specified name is not found.
 *
 * Globals:
 * - none
 *
 * @param FeatureDefs    definitions of feature types/extractors
 * @param ShortName short name of a feature type
 * @return Feature type which corresponds to ShortName.
 */
uint32_t ShortNameToFeatureType(const FEATURE_DEFS_STRUCT &FeatureDefs, const char *ShortName) {
  for (int i = 0; i < FeatureDefs.NumFeatureTypes; i++) {
    if (!strcmp((FeatureDefs.FeatureDesc[i]->ShortName), ShortName)) {
      return static_cast<uint32_t>(i);
    }
  }
  ASSERT_HOST(!"Illegal short name for a feature");
  return 0;
}

} // namespace tesseract