mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-11-24 19:19:05 +08:00
ff3d550c05
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@219 d0cd1f9f-072b-0410-8dd7-cf729c803f20
311 lines
10 KiB
C++
311 lines
10 KiB
C++
/******************************************************************************
|
|
** 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"
|
|
|
|
/**----------------------------------------------------------------------------
|
|
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;
|
|
FeatureSet->NumFeatures++;
|
|
return (TRUE);
|
|
|
|
} /* AddFeature */
|
|
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
void DefaultInitFXVars() {
|
|
/*
|
|
** Parameters: none
|
|
** Globals: none
|
|
** Operation: This routine can be used by any feature extractor which
|
|
** does not use adjustable controls.
|
|
** It does nothing.
|
|
** Return: none
|
|
** Exceptions: none
|
|
** History: Wed May 23 16:37:45 1990, DSJ, Created.
|
|
*/
|
|
} /* DefaultInitFXVars */
|
|
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
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) {
|
|
c_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(FEATURE_DESC 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, FEATURE_DESC 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");
|
|
}
|
|
return (Feature);
|
|
|
|
} /* ReadFeature */
|
|
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
FEATURE_SET ReadFeatureSet(FILE *File, FEATURE_DESC 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++)
|
|
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, FEATURE_DESC 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 */
|