mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-12-05 10:49:01 +08:00
53fc4456cc
Eliminated the flexfx scheme for calling global feature extractor functions through an array of function pointers. Deleted dead code I found as a by-product. This CL does not change BlobToTrainingSample or ExtractFeatures to be full members of Classify (the eventual goal) as that would make it even bigger, since there are a lot of callers to these functions. When ExtractFeatures and BlobToTrainingSample are members of Classify they will be able to access control parameters in Classify, which will greatly simplify developing variations to the feature extraction process.
313 lines
10 KiB
C++
313 lines
10 KiB
C++
/******************************************************************************
|
|
** Filename: featdefs.c
|
|
** Purpose: Definitions of currently defined feature types.
|
|
** Author: Dan Johnson
|
|
** History: Mon May 21 10:26:21 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
|
|
-----------------------------------------------------------------------------*/
|
|
#ifdef _MSC_VER
|
|
#include <mathfix.h>
|
|
#endif
|
|
|
|
#include "featdefs.h"
|
|
#include "emalloc.h"
|
|
#include "danerror.h"
|
|
#include "scanutils.h"
|
|
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
|
|
/** define errors triggered by this module */
|
|
#define ILLEGAL_NUM_SETS 3001
|
|
|
|
#define PICO_FEATURE_LENGTH 0.05
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
Global Data Definitions and Declarations
|
|
-----------------------------------------------------------------------------*/
|
|
const char* kMicroFeatureType = "mf";
|
|
const char* kCNFeatureType = "cn";
|
|
const char* kIntFeatureType = "if";
|
|
const char* 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.
|
|
FLOAT32 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];
|
|
}
|
|
}
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
/**
|
|
* Release the memory consumed by the specified character
|
|
* description and all of the features in that description.
|
|
*
|
|
* @param CharDesc character description to be deallocated
|
|
*
|
|
* Globals:
|
|
* - none
|
|
*
|
|
* @note Exceptions: none
|
|
* @note History: Wed May 23 13:52:19 1990, DSJ, Created.
|
|
*/
|
|
void FreeCharDescription(CHAR_DESC CharDesc) {
|
|
int i;
|
|
|
|
if (CharDesc) {
|
|
for (i = 0; i < CharDesc->NumFeatureSets; i++)
|
|
FreeFeatureSet (CharDesc->FeatureSets[i]);
|
|
Efree(CharDesc);
|
|
}
|
|
} /* FreeCharDescription */
|
|
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
/**
|
|
* Allocate a new character description, initialize its
|
|
* feature sets to be empty, and return it.
|
|
*
|
|
* Globals:
|
|
* - none
|
|
*
|
|
* @return New character description structure.
|
|
* @note Exceptions: none
|
|
* @note History: Wed May 23 15:27:10 1990, DSJ, Created.
|
|
*/
|
|
CHAR_DESC NewCharDescription(const FEATURE_DEFS_STRUCT &FeatureDefs) {
|
|
CHAR_DESC CharDesc;
|
|
int i;
|
|
|
|
CharDesc = (CHAR_DESC) Emalloc (sizeof (CHAR_DESC_STRUCT));
|
|
CharDesc->NumFeatureSets = FeatureDefs.NumFeatureTypes;
|
|
|
|
for (i = 0; i < CharDesc->NumFeatureSets; i++)
|
|
CharDesc->FeatureSets[i] = NULL;
|
|
|
|
return (CharDesc);
|
|
|
|
} /* NewCharDescription */
|
|
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
/**
|
|
* 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
|
|
*
|
|
* @note Exceptions: none
|
|
* @note History: Wed May 23 17:21:18 1990, DSJ, Created.
|
|
*/
|
|
void WriteCharDescription(const FEATURE_DEFS_STRUCT& FeatureDefs,
|
|
CHAR_DESC CharDesc, STRING* str) {
|
|
int Type;
|
|
int NumSetsToWrite = 0;
|
|
|
|
for (Type = 0; Type < CharDesc->NumFeatureSets; Type++)
|
|
if (CharDesc->FeatureSets[Type])
|
|
NumSetsToWrite++;
|
|
|
|
str->add_str_int(" ", NumSetsToWrite);
|
|
*str += "\n";
|
|
for (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 CharDesc) {
|
|
bool anything_written = false;
|
|
bool well_formed = true;
|
|
for (int 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 (isnan(feat->Params[p]) || 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.
|
|
* @note Exceptions:
|
|
* - ILLEGAL_NUM_SETS
|
|
* @note History: Wed May 23 17:32:48 1990, DSJ, Created.
|
|
*/
|
|
CHAR_DESC ReadCharDescription(const FEATURE_DEFS_STRUCT &FeatureDefs,
|
|
FILE *File) {
|
|
int NumSetsToRead;
|
|
char ShortName[FEAT_NAME_SIZE];
|
|
CHAR_DESC CharDesc;
|
|
int Type;
|
|
|
|
if (tfscanf(File, "%d", &NumSetsToRead) != 1 ||
|
|
NumSetsToRead < 0 || NumSetsToRead > FeatureDefs.NumFeatureTypes)
|
|
DoError (ILLEGAL_NUM_SETS, "Illegal number of feature sets");
|
|
|
|
CharDesc = NewCharDescription(FeatureDefs);
|
|
for (; NumSetsToRead > 0; NumSetsToRead--) {
|
|
tfscanf(File, "%s", ShortName);
|
|
Type = ShortNameToFeatureType(FeatureDefs, ShortName);
|
|
CharDesc->FeatureSets[Type] =
|
|
ReadFeatureSet (File, FeatureDefs.FeatureDesc[Type]);
|
|
}
|
|
return (CharDesc);
|
|
|
|
} // ReadCharDescription
|
|
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
/**
|
|
* Search thru 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.
|
|
* @note Exceptions:
|
|
* - ILLEGAL_SHORT_NAME
|
|
* @note History: Wed May 23 15:36:05 1990, DSJ, Created.
|
|
*/
|
|
int ShortNameToFeatureType(const FEATURE_DEFS_STRUCT &FeatureDefs,
|
|
const char *ShortName) {
|
|
int i;
|
|
|
|
for (i = 0; i < FeatureDefs.NumFeatureTypes; i++)
|
|
if (!strcmp ((FeatureDefs.FeatureDesc[i]->ShortName), ShortName))
|
|
return (i);
|
|
DoError (ILLEGAL_SHORT_NAME, "Illegal short name for a feature");
|
|
return 0;
|
|
|
|
} // ShortNameToFeatureType
|