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694d3f2c20
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@291 d0cd1f9f-072b-0410-8dd7-cf729c803f20
144 lines
5.4 KiB
C
144 lines
5.4 KiB
C
/******************************************************************************
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** Filename: features.h
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** Purpose: Generic definition of a feature.
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** Author: Dan Johnson
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** History: Sun May 20 10:28:30 1990, DSJ, Created.
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**
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** (c) Copyright Hewlett-Packard Company, 1988.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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******************************************************************************/
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#ifndef FEATURES_H
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#define FEATURES_H
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/**----------------------------------------------------------------------------
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Include Files and Type Defines
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----------------------------------------------------------------------------**/
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#include "funcdefs.h"
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#include "tessclas.h"
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#include "fxdefs.h"
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#include <stdio.h>
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#undef Min
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#undef Max
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#define FEAT_NAME_SIZE 80
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/*define trap errors which can be caused by this module*/
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#define ILLEGAL_FEATURE_PARAM 1000
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#define ILLEGAL_NUM_FEATURES 1001
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/* A character is described by multiple sets of extracted features. Each
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set contains a number of features of a particular type, for example, a
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set of bays, or a set of closures, or a set of microfeatures. Each
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feature consists of a number of parameters. All features within a
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feature set contain the same number of parameters. All circular
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parameters are required to be the first parameters in the feature.*/
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typedef struct
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{
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struct fds *Type; /* points to description of feature type */
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FLOAT32 Params[1]; /* variable size array - params for feature */
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} FEATURE_STRUCT;
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typedef FEATURE_STRUCT *FEATURE;
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typedef struct
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{
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uinT16 NumFeatures; /* number of features in set */
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uinT16 MaxNumFeatures; /* maximum size of feature set */
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FEATURE Features[1]; /* variable size array of features */
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} FEATURE_SET_STRUCT;
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typedef FEATURE_SET_STRUCT *FEATURE_SET;
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/* Define various function types which will be needed for "class methods"*/
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typedef FEATURE (*FEAT_FUNC) ();
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typedef FEATURE_SET (*FX_FUNC) (TBLOB *, LINE_STATS *);
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typedef FLOAT32 (*PENALTY_FUNC) ();
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typedef struct
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{
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inT8 Circular; /* TRUE if dimension wraps around */
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inT8 NonEssential; /* TRUE if dimension not used in searches */
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FLOAT32 Min; /* low end of range for circular dimensions */
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FLOAT32 Max; /* high end of range for circular dimensions */
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FLOAT32 Range; /* Max - Min */
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FLOAT32 HalfRange; /* (Max - Min)/2 */
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FLOAT32 MidRange; /* (Max + Min)/2 */
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} PARAM_DESC;
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typedef struct fds
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{
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uinT16 NumParams; /* total # of params */
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uinT8 NumLinearParams; /* # of linear params */
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uinT8 NumCircularParams; /* # of linear params */
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uinT8 MinFeatPerChar; /* min # of feats allowed */
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uinT8 MaxFeatPerChar; /* max # of feats allowed */
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char LongName[FEAT_NAME_SIZE]; /* long name for feature */
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char ShortName[FEAT_NAME_SIZE];/* short name for feature */
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PARAM_DESC *ParamDesc; /* array - one per param */
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} FEATURE_DESC_STRUCT;
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/* one per feature type */
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typedef FEATURE_DESC_STRUCT *FEATURE_DESC;
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typedef struct fxs
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{
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FX_FUNC Extractor; /* func to extract features */
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} FEATURE_EXT_STRUCT;
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/*----------------------------------------------------------------------
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Macros for defining the parameters of a new features
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----------------------------------------------------------------------*/
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#define StartParamDesc(Name) \
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static PARAM_DESC Name[] = {
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#define DefineParam(Circular, NonEssential, Min, Max) \
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{Circular, NonEssential, Min, Max, \
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(Max) - (Min), (((Max) - (Min))/2.0), (((Max) + (Min))/2.0)},
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#define EndParamDesc };
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/*----------------------------------------------------------------------
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Macro for describing a new feature. The parameters of the macro
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are as follows:
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DefineFeature (Name, NumLinear, NumCircular,
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MinFeatPerChar, MaxFeatPerChar,
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LongName, ShortName, ParamName)
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----------------------------------------------------------------------*/
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#define DefineFeature(Name, NL, NC, Min, Max, LN, SN, PN) \
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FEATURE_DESC_STRUCT Name = { \
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((NL) + (NC)), NL, NC, Min, Max, LN, SN, PN};
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#define DefineFeatureExt(Name, E) FEATURE_EXT_STRUCT Name = {E};
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/*----------------------------------------------------------------------
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Generic routines that work for all feature types
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----------------------------------------------------------------------*/
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BOOL8 AddFeature(FEATURE_SET FeatureSet, FEATURE Feature);
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void FreeFeature(FEATURE Feature);
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void FreeFeatureSet(FEATURE_SET FeatureSet);
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FEATURE NewFeature(FEATURE_DESC FeatureDesc);
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FEATURE_SET NewFeatureSet(int NumFeatures);
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FEATURE ReadFeature(FILE *File, FEATURE_DESC FeatureDesc);
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FEATURE_SET ReadFeatureSet(FILE *File, FEATURE_DESC FeatureDesc);
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void WriteFeature(FILE *File, FEATURE Feature);
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void WriteFeatureSet(FILE *File, FEATURE_SET FeatureSet);
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void WriteOldParamDesc(FILE *File, FEATURE_DESC FeatureDesc);
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#endif
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