classify/normfeat.h File Reference

#include "ocrfeatures.h"
#include "tessclas.h"
#include "fxdefs.h"

Go to the source code of this file.

Defines

• #define LENGTH_COMPRESSION   (10.0)

Enumerations

• enum NORM_PARAM_NAME { CharNormY, CharNormLength, CharNormRx, CharNormRy }

  Information on something normalized ?? More...
  

Functions

• FLOAT32 ActualOutlineLength (FEATURE Feature)

  Computes the length that the outline would have been if it were baseline normalized instead of character normalized.
  

• FEATURE_SET ExtractCharNormFeatures (TBLOB *Blob, LINE_STATS *LineStats)

  Compute a feature whose parameters describe how a character will be affected by the character normalization algorithm.
  

Variables

• FEATURE_DESC_STRUCT CharNormDesc

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Define Documentation

#define LENGTH_COMPRESSION   (10.0)

Note:

File: normfeat.h
Definition of character normalization features.

Author:

Dan Johnson

Date:

12/14/90, 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.

Definition at line 29 of file normfeat.h.

Referenced by ActualOutlineLength(), ExtractCharNormFeatures(), and GetIntCharNormFeatures().

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Enumeration Type Documentation

enum NORM_PARAM_NAME

Information on something normalized ??

Enumerator:

CharNormY
CharNormLength
CharNormRx
CharNormRy

Definition at line 35 of file normfeat.h.

{
   CharNormY,
   CharNormLength,
   CharNormRx,
   CharNormRy
} NORM_PARAM_NAME;

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Function Documentation

FLOAT32 ActualOutlineLength

(

FEATURE

Feature

)

Computes the length that the outline would have been if it were baseline normalized instead of character normalized.

Parameters:

Feature

Normalization feature

Returns:

Baseline normalized length of outline.

Note:

Exceptions: none

Date:

Thu Dec 20 14:50:57 1990, DSJ, Created.

Definition at line 49 of file normfeat.cpp.

References CharNormLength, LENGTH_COMPRESSION, and ParamOf.

                                             { 
  return (ParamOf (Feature, CharNormLength) * LENGTH_COMPRESSION);

}                                /* ActualOutlineLength */

FEATURE_SET ExtractCharNormFeatures	(	TBLOB *	Blob,
		LINE_STATS *	LineStats
	)

Compute a feature whose parameters describe how a character will be affected by the character normalization algorithm.

Parameters:

	Blob	Blob to extract char norm feature from
	LineStats	Statistics on text row blob is in

Returns:

Character normalization feature for Blob.

The feature parameters are:

• y position of center of mass in baseline coordinates
• total length of outlines in baseline coordinates divided by a scale factor
• radii of gyration about the center of mass in baseline coordinates

  Note:

  Exceptions: none

  Date:

  Wed May 23 18:06:38 1990, DSJ, Created.

Definition at line 72 of file normfeat.cpp.

References AddFeature(), BaselineAt, CharNormDesc, CharNormLength, CharNormRx, CharNormRy, CharNormY, ComputeScaleFactor, ConvertBlob(), ExtractIntFeat(), FreeOutlines(), FXInfo, INT_FX_RESULT_STRUCT::Length, LENGTH_COMPRESSION, NewFeature(), NewFeatureSet(), ParamOf, INT_FX_RESULT_STRUCT::Rx, INT_FX_RESULT_STRUCT::Ry, INT_FX_RESULT_STRUCT::Xmean, and INT_FX_RESULT_STRUCT::Ymean.

                                                                        { 
  FEATURE_SET FeatureSet;
  FEATURE Feature;
  FLOAT32 Scale;
  FLOAT32 Baseline;
  LIST Outlines;
  INT_FEATURE_ARRAY blfeatures;
  INT_FEATURE_ARRAY cnfeatures;
  INT_FX_RESULT_STRUCT FXInfo;

  /* allocate the feature and feature set - note that there is always one
     and only one char normalization feature for any blob */
  FeatureSet = NewFeatureSet (1);
  Feature = NewFeature (&CharNormDesc);
  AddFeature(FeatureSet, Feature); 

  /* compute the normalization statistics for this blob */
  Outlines = ConvertBlob (Blob);
  /*---------Debug--------------------------------------------------*
  OFile = fopen ("f:/ims/debug/nfOutline.logCPP", "r");
  if (OFile == NULL)
  {
    OFile = Efopen ("f:/ims/debug/nfOutline.logCPP", "w");
    WriteOutlines(OFile, Outlines);
  }
  else
  {
    fclose (OFile);
    OFile = Efopen ("f:/ims/debug/nfOutline.logCPP", "a");
  }
  WriteOutlines(OFile, Outlines);
  fclose (OFile);
  *--------------------------------------------------------------------*/

  ExtractIntFeat(Blob, blfeatures, cnfeatures, &FXInfo);
  Baseline = BaselineAt (LineStats, FXInfo.Xmean);
  Scale = ComputeScaleFactor (LineStats);
  ParamOf (Feature, CharNormY) = (FXInfo.Ymean - Baseline) * Scale;
  ParamOf (Feature, CharNormLength) =
    FXInfo.Length * Scale / LENGTH_COMPRESSION;
  ParamOf (Feature, CharNormRx) = FXInfo.Rx * Scale;
  ParamOf (Feature, CharNormRy) = FXInfo.Ry * Scale;

  /*---------Debug--------------------------------------------------*
  File = fopen ("f:/ims/debug/nfFeatSet.logCPP", "r");
  if (File == NULL)
  {
    File = Efopen ("f:/ims/debug/nfFeatSet.logCPP", "w");
    WriteFeatureSet(File, FeatureSet);
  }
  else
  {
    fclose (File);
    File = Efopen ("f:/ims/debug/nfFeatSet.logCPP", "a");
  }
  WriteFeatureSet(File, FeatureSet);
  fclose (File);
  *--------------------------------------------------------------------*/
  FreeOutlines(Outlines); 
  return (FeatureSet);
}                                /* ExtractCharNormFeatures */

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Variable Documentation

FEATURE_DESC_STRUCT CharNormDesc

Referenced by ExtractCharNormFeatures(), and GetIntCharNormFeatures().

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