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126 lines
4.9 KiB
C++
126 lines
4.9 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 "blobs.h"
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#include <stdio.h>
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class DENORM;
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struct INT_FX_RESULT_STRUCT;
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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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struct PARAM_DESC {
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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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};
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struct FEATURE_DESC_STRUCT {
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uinT16 NumParams; // total # of params
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const char *ShortName; // short name for feature
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const PARAM_DESC *ParamDesc; // array - one per param
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};
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typedef FEATURE_DESC_STRUCT *FEATURE_DESC;
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struct FEATURE_STRUCT {
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const FEATURE_DESC_STRUCT *Type; // points to description of feature type
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FLOAT32 Params[1]; // variable size array - params for feature
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};
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typedef FEATURE_STRUCT *FEATURE;
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struct FEATURE_SET_STRUCT {
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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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};
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typedef FEATURE_SET_STRUCT *FEATURE_SET;
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// A generic character description as a char pointer. In reality, it will be
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// a pointer to some data structure. Paired feature extractors/matchers need
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// to agree on the data structure to be used, however, the high level
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// classifier does not need to know the details of this data structure.
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typedef char *CHAR_FEATURES;
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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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const 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, ShortName, ParamName)
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----------------------------------------------------------------------*/
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#define DefineFeature(Name, NL, NC, SN, PN) \
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const FEATURE_DESC_STRUCT Name = { \
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((NL) + (NC)), SN, PN};
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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(const FEATURE_DESC_STRUCT *FeatureDesc);
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FEATURE_SET NewFeatureSet(int NumFeatures);
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FEATURE ReadFeature(FILE *File, const FEATURE_DESC_STRUCT *FeatureDesc);
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FEATURE_SET ReadFeatureSet(FILE *File, const FEATURE_DESC_STRUCT *FeatureDesc);
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void WriteFeature(FEATURE Feature, STRING* str);
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void WriteFeatureSet(FEATURE_SET FeatureSet, STRING* str);
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#endif
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