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tesseract/classify/ocrfeatures.cpp

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/******************************************************************************
** Filename: features.c
** Purpose: Generic definition of a feature.
** Author: Dan Johnson
** History: Mon May 21 10:49:04 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 Files and Type Defines
----------------------------------------------------------------------------**/
#include "ocrfeatures.h"
#include "emalloc.h"
#include "callcpp.h"
#include "danerror.h"
#include "freelist.h"
#include "scanutils.h"
#include <assert.h>
#include <math.h>
/**----------------------------------------------------------------------------
Public Code
----------------------------------------------------------------------------**/
/*---------------------------------------------------------------------------*/
BOOL8 AddFeature(FEATURE_SET FeatureSet, FEATURE Feature) {
/*
** Parameters:
** FeatureSet set of features to add Feature to
** Feature feature to be added to FeatureSet
** Globals: none
** Operation: Add a feature to a feature set. If the feature set is
** already full, FALSE is returned to indicate that the
** feature could not be added to the set; otherwise, TRUE is
** returned.
** Return: TRUE if feature added to set, FALSE if set is already full.
** Exceptions: none
** History: Tue May 22 17:22:23 1990, DSJ, Created.
*/
if (FeatureSet->NumFeatures >= FeatureSet->MaxNumFeatures) {
FreeFeature(Feature);
return FALSE;
}
FeatureSet->Features[FeatureSet->NumFeatures++] = Feature;
return TRUE;
} /* AddFeature */
/*---------------------------------------------------------------------------*/
void FreeFeature(FEATURE Feature) {
/*
** Parameters:
** Feature feature to be deallocated.
** Globals: none
** Operation: Release the memory consumed by the specified feature.
** Return: none
** Exceptions: none
** History: Mon May 21 13:33:27 1990, DSJ, Created.
*/
if (Feature) {
free_struct (Feature, sizeof (FEATURE_STRUCT)
+ sizeof (FLOAT32) * (Feature->Type->NumParams - 1),
"sizeof(FEATURE_STRUCT)+sizeof(FLOAT32)*(NumParamsIn(Feature)-1)");
}
} /* FreeFeature */
/*---------------------------------------------------------------------------*/
void FreeFeatureSet(FEATURE_SET FeatureSet) {
/*
** Parameters:
** FeatureSet set of features to be freed
** Globals: none
** Operation: Release the memory consumed by the specified feature
** set. This routine also frees the memory consumed by the
** features contained in the set.
** Return: none
** Exceptions: none
** History: Mon May 21 13:59:46 1990, DSJ, Created.
*/
int i;
if (FeatureSet) {
for (i = 0; i < FeatureSet->NumFeatures; i++)
FreeFeature(FeatureSet->Features[i]);
memfree(FeatureSet);
}
} /* FreeFeatureSet */
/*---------------------------------------------------------------------------*/
FEATURE NewFeature(const FEATURE_DESC_STRUCT* FeatureDesc) {
/*
** Parameters:
** FeatureDesc description of feature to be created.
** Globals: none
** Operation: Allocate and return a new feature of the specified
** type.
** Return: New feature.
** Exceptions: none
** History: Mon May 21 14:06:42 1990, DSJ, Created.
*/
FEATURE Feature;
Feature = (FEATURE) alloc_struct (sizeof (FEATURE_STRUCT) +
(FeatureDesc->NumParams - 1) *
sizeof (FLOAT32),
"sizeof(FEATURE_STRUCT)+sizeof(FLOAT32)*(NumParamsIn(Feature)-1)");
Feature->Type = FeatureDesc;
return (Feature);
} /* NewFeature */
/*---------------------------------------------------------------------------*/
FEATURE_SET NewFeatureSet(int NumFeatures) {
/*
** Parameters:
** NumFeatures maximum # of features to be put in feature set
** Globals: none
** Operation: Allocate and return a new feature set large enough to
** hold the specified number of features.
** Return: New feature set.
** Exceptions: none
** History: Mon May 21 14:22:40 1990, DSJ, Created.
*/
FEATURE_SET FeatureSet;
FeatureSet = (FEATURE_SET) Emalloc (sizeof (FEATURE_SET_STRUCT) +
(NumFeatures - 1) * sizeof (FEATURE));
FeatureSet->MaxNumFeatures = NumFeatures;
FeatureSet->NumFeatures = 0;
return (FeatureSet);
} /* NewFeatureSet */
/*---------------------------------------------------------------------------*/
FEATURE ReadFeature(FILE *File, const FEATURE_DESC_STRUCT* FeatureDesc) {
/*
** Parameters:
** File open text file to read feature from
** FeatureDesc specifies type of feature to read from File
** Globals: none
** Operation: Create a new feature of the specified type and read in
** the value of its parameters from File. The extra penalty
** for the feature is also computed by calling the appropriate
** function for the specified feature type. The correct text
** representation for a feature is a list of N floats where
** N is the number of parameters in the feature.
** Return: New feature read from File.
** Exceptions: ILLEGAL_FEATURE_PARAM if text file doesn't match expected format
** History: Wed May 23 08:53:16 1990, DSJ, Created.
*/
FEATURE Feature;
int i;
Feature = NewFeature (FeatureDesc);
for (i = 0; i < Feature->Type->NumParams; i++) {
if (fscanf (File, "%f", &(Feature->Params[i])) != 1)
DoError (ILLEGAL_FEATURE_PARAM, "Illegal feature parameter spec");
#ifndef WIN32
assert (!isnan(Feature->Params[i]));
#endif
}
return (Feature);
} /* ReadFeature */
/*---------------------------------------------------------------------------*/
FEATURE_SET ReadFeatureSet(FILE *File, const FEATURE_DESC_STRUCT* FeatureDesc) {
/*
** Parameters:
** File open text file to read new feature set from
** FeatureDesc specifies type of feature to read from File
** Globals: none
** Operation: Create a new feature set of the specified type and read in
** the features from File. The correct text representation
** for a feature set is an integer which specifies the number (N)
** of features in a set followed by a list of N feature
** descriptions.
** Return: New feature set read from File.
** Exceptions: none
** History: Wed May 23 09:17:31 1990, DSJ, Created.
*/
FEATURE_SET FeatureSet;
int NumFeatures;
int i;
if (fscanf (File, "%d", &NumFeatures) != 1 || NumFeatures < 0)
DoError (ILLEGAL_NUM_FEATURES, "Illegal number of features in set");
FeatureSet = NewFeatureSet (NumFeatures);
for (i = 0; i < NumFeatures; i++)
AddFeature (FeatureSet, ReadFeature (File, FeatureDesc));
return (FeatureSet);
} /* ReadFeatureSet */
/*---------------------------------------------------------------------------*/
void WriteFeature(FILE *File, FEATURE Feature) {
/*
** Parameters:
** File open text file to write Feature to
** Feature feature to write out to File
** Globals: none
** Operation: Write a textual representation of Feature to File.
** This representation is simply a list of the N parameters
** of the feature, terminated with a newline. It is assumed
** that the ExtraPenalty field can be reconstructed from the
** parameters of the feature. It is also assumed that the
** feature type information is specified or assumed elsewhere.
** Return: none
** Exceptions: none
** History: Wed May 23 09:28:18 1990, DSJ, Created.
*/
int i;
for (i = 0; i < Feature->Type->NumParams; i++) {
#ifndef WIN32
assert (!isnan(Feature->Params[i]));
#endif
fprintf (File, " %12g", Feature->Params[i]);
}
fprintf (File, "\n");
} /* WriteFeature */
/*---------------------------------------------------------------------------*/
void WriteFeatureSet(FILE *File, FEATURE_SET FeatureSet) {
/*
** Parameters:
** File open text file to write FeatureSet to
** FeatureSet feature set to write to File
** Globals: none
** Operation: Write a textual representation of FeatureSet to File.
** This representation is an integer specifying the number of
** features in the set, followed by a newline, followed by
** text representations for each feature in the set.
** Return: none
** Exceptions: none
** History: Wed May 23 10:06:03 1990, DSJ, Created.
*/
int i;
if (FeatureSet) {
fprintf (File, "%d\n", FeatureSet->NumFeatures);
for (i = 0; i < FeatureSet->NumFeatures; i++)
WriteFeature (File, FeatureSet->Features[i]);
}
} /* WriteFeatureSet */
/*---------------------------------------------------------------------------*/
void WriteOldParamDesc(FILE *File, const FEATURE_DESC_STRUCT* FeatureDesc) {
/*
** Parameters:
** File open text file to write FeatureDesc to
** FeatureDesc feature descriptor to write to File
** Globals: none
** Operation: Write a textual representation of FeatureDesc to File
** in the old format (i.e. the format used by the clusterer).
** This format is:
** Number of Params
** Description of Param 1
** ...
** Return: none
** Exceptions: none
** History: Fri May 25 15:27:18 1990, DSJ, Created.
*/
int i;
fprintf (File, "%d\n", FeatureDesc->NumParams);
for (i = 0; i < FeatureDesc->NumParams; i++) {
if (FeatureDesc->ParamDesc[i].Circular)
fprintf (File, "circular ");
else
fprintf (File, "linear ");
if (FeatureDesc->ParamDesc[i].NonEssential)
fprintf (File, "non-essential ");
else
fprintf (File, "essential ");
fprintf (File, "%f %f\n",
FeatureDesc->ParamDesc[i].Min, FeatureDesc->ParamDesc[i].Max);
}
} /* WriteOldParamDesc */
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