mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-11-28 05:39:35 +08:00
126 lines
4.9 KiB
C++
126 lines
4.9 KiB
C++
/******************************************************************************
|
|
** Filename: features.h
|
|
** Purpose: Generic definition of a feature.
|
|
** Author: Dan Johnson
|
|
** History: Sun May 20 10:28:30 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.
|
|
******************************************************************************/
|
|
#ifndef FEATURES_H
|
|
#define FEATURES_H
|
|
|
|
/**----------------------------------------------------------------------------
|
|
Include Files and Type Defines
|
|
----------------------------------------------------------------------------**/
|
|
#include "blobs.h"
|
|
|
|
#include <stdio.h>
|
|
|
|
class DENORM;
|
|
struct INT_FX_RESULT_STRUCT;
|
|
|
|
#undef Min
|
|
#undef Max
|
|
#define FEAT_NAME_SIZE 80
|
|
|
|
// define trap errors which can be caused by this module
|
|
#define ILLEGAL_FEATURE_PARAM 1000
|
|
#define ILLEGAL_NUM_FEATURES 1001
|
|
|
|
// A character is described by multiple sets of extracted features. Each
|
|
// set contains a number of features of a particular type, for example, a
|
|
// set of bays, or a set of closures, or a set of microfeatures. Each
|
|
// feature consists of a number of parameters. All features within a
|
|
// feature set contain the same number of parameters. All circular
|
|
// parameters are required to be the first parameters in the feature.
|
|
|
|
struct PARAM_DESC {
|
|
inT8 Circular; // TRUE if dimension wraps around
|
|
inT8 NonEssential; // TRUE if dimension not used in searches
|
|
FLOAT32 Min; // low end of range for circular dimensions
|
|
FLOAT32 Max; // high end of range for circular dimensions
|
|
FLOAT32 Range; // Max - Min
|
|
FLOAT32 HalfRange; // (Max - Min)/2
|
|
FLOAT32 MidRange; // (Max + Min)/2
|
|
};
|
|
|
|
struct FEATURE_DESC_STRUCT {
|
|
uinT16 NumParams; // total # of params
|
|
const char *ShortName; // short name for feature
|
|
const PARAM_DESC *ParamDesc; // array - one per param
|
|
};
|
|
typedef FEATURE_DESC_STRUCT *FEATURE_DESC;
|
|
|
|
struct FEATURE_STRUCT {
|
|
const FEATURE_DESC_STRUCT *Type; // points to description of feature type
|
|
FLOAT32 Params[1]; // variable size array - params for feature
|
|
};
|
|
typedef FEATURE_STRUCT *FEATURE;
|
|
|
|
struct FEATURE_SET_STRUCT {
|
|
uinT16 NumFeatures; // number of features in set
|
|
uinT16 MaxNumFeatures; // maximum size of feature set
|
|
FEATURE Features[1]; // variable size array of features
|
|
};
|
|
typedef FEATURE_SET_STRUCT *FEATURE_SET;
|
|
|
|
// A generic character description as a char pointer. In reality, it will be
|
|
// a pointer to some data structure. Paired feature extractors/matchers need
|
|
// to agree on the data structure to be used, however, the high level
|
|
// classifier does not need to know the details of this data structure.
|
|
typedef char *CHAR_FEATURES;
|
|
|
|
/*----------------------------------------------------------------------
|
|
Macros for defining the parameters of a new features
|
|
----------------------------------------------------------------------*/
|
|
#define StartParamDesc(Name) \
|
|
const PARAM_DESC Name[] = {
|
|
|
|
#define DefineParam(Circular, NonEssential, Min, Max) \
|
|
{Circular, NonEssential, Min, Max, \
|
|
(Max) - (Min), (((Max) - (Min))/2.0), (((Max) + (Min))/2.0)},
|
|
|
|
#define EndParamDesc };
|
|
|
|
/*----------------------------------------------------------------------
|
|
Macro for describing a new feature. The parameters of the macro
|
|
are as follows:
|
|
|
|
DefineFeature (Name, NumLinear, NumCircular, ShortName, ParamName)
|
|
----------------------------------------------------------------------*/
|
|
#define DefineFeature(Name, NL, NC, SN, PN) \
|
|
const FEATURE_DESC_STRUCT Name = { \
|
|
((NL) + (NC)), SN, PN};
|
|
|
|
/*----------------------------------------------------------------------
|
|
Generic routines that work for all feature types
|
|
----------------------------------------------------------------------*/
|
|
BOOL8 AddFeature(FEATURE_SET FeatureSet, FEATURE Feature);
|
|
|
|
void FreeFeature(FEATURE Feature);
|
|
|
|
void FreeFeatureSet(FEATURE_SET FeatureSet);
|
|
|
|
FEATURE NewFeature(const FEATURE_DESC_STRUCT *FeatureDesc);
|
|
|
|
FEATURE_SET NewFeatureSet(int NumFeatures);
|
|
|
|
FEATURE ReadFeature(FILE *File, const FEATURE_DESC_STRUCT *FeatureDesc);
|
|
|
|
FEATURE_SET ReadFeatureSet(FILE *File, const FEATURE_DESC_STRUCT *FeatureDesc);
|
|
|
|
void WriteFeature(FEATURE Feature, STRING* str);
|
|
|
|
void WriteFeatureSet(FEATURE_SET FeatureSet, STRING* str);
|
|
|
|
#endif
|