tesseract-ocr/classify/flexfx.cpp

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/******************************************************************************
 **     Filename:    flexfx.c
 **     Purpose:     Interface to flexible feature extractor.
 **     Author:      Dan Johnson
 **     History:     Wed May 23 13:45:10 1990, DSJ, Created.
 **
 **     (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 "flexfx.h"
#include "featdefs.h"
#include "emalloc.h"
#include <string.h>
#include <stdio.h>

/*---------------------------------------------------------------------------*/
CHAR_DESC ExtractFlexFeatures(const FEATURE_DEFS_STRUCT &FeatureDefs,
                              TBLOB *Blob, const DENORM& denorm) {
/*
 **     Parameters:
 **             Blob            blob to extract features from
 **             denorm  control parameter for feature extractor
 **     Globals: none
 **     Operation: Allocate a new character descriptor and fill it in by
 **             calling all feature extractors which are enabled.
 **     Return: Structure containing features extracted from Blob.
 **     Exceptions: none
 **     History: Wed May 23 13:46:22 1990, DSJ, Created.
 */
  int Type;
  CHAR_DESC CharDesc;

  CharDesc = NewCharDescription(FeatureDefs);

  for (Type = 0; Type < CharDesc->NumFeatureSets; Type++)
    if (FeatureDefs.FeatureExtractors[Type] != NULL &&
        FeatureDefs.FeatureExtractors[Type]->Extractor != NULL) {
      CharDesc->FeatureSets[Type] =
        (FeatureDefs.FeatureExtractors[Type])->Extractor(Blob, denorm);
      if (CharDesc->FeatureSets[Type] == NULL) {
        FreeCharDescription(CharDesc);
        return NULL;
      }
    }

  return (CharDesc);

}                                /* ExtractFlexFeatures */