ocrfeatures.cpp File Reference

#include "ocrfeatures.h"
#include "emalloc.h"
#include "callcpp.h"
#include "scanutils.h"
#include <cassert>
#include <cmath>

Go to the source code of this file.

Functions
bool	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_SET	ReadFeatureSet (FILE *File, const FEATURE_DESC_STRUCT *FeatureDesc)
void	WriteFeatureSet (FEATURE_SET FeatureSet, STRING *str)

Function Documentation

AddFeature()

bool AddFeature	(	FEATURE_SET	FeatureSet,
		FEATURE	Feature
	)

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.

Parameters

FeatureSet	set of features to add Feature to
Feature	feature to be added to FeatureSet

Returns

true if feature added to set, false if set is already full.

Definition at line 39 of file ocrfeatures.cpp.

                                                         {
  if (FeatureSet->NumFeatures >= FeatureSet->MaxNumFeatures) {
    FreeFeature(Feature);
    return false;
  }
 
  FeatureSet->Features[FeatureSet->NumFeatures++] = Feature;
  return true;

FreeFeature()

void FreeFeature

(

FEATURE

Feature

)

Release the memory consumed by the specified feature.

Parameters

Feature

feature to be deallocated.

Definition at line 53 of file ocrfeatures.cpp.

{ free(Feature); } /* FreeFeature */

FreeFeatureSet()

void FreeFeatureSet

(

FEATURE_SET

FeatureSet

)

Release the memory consumed by the specified feature set. This routine also frees the memory consumed by the features contained in the set.

Parameters

FeatureSet

set of features to be freed

Definition at line 61 of file ocrfeatures.cpp.

                                            {
  int i;
 
  if (FeatureSet) {
    for (i = 0; i < FeatureSet->NumFeatures; i++)
      FreeFeature(FeatureSet->Features[i]);
    free(FeatureSet);
  }

NewFeature()

FEATURE NewFeature

(

const FEATURE_DESC_STRUCT *

FeatureDesc

)

Allocate and return a new feature of the specified type.

Parameters

FeatureDesc

description of feature to be created.

Returns

New FEATURE.

Definition at line 77 of file ocrfeatures.cpp.

                                                           {
  FEATURE Feature;
 
  Feature = static_cast<FEATURE>(malloc(sizeof(FEATURE_STRUCT) +
                            (FeatureDesc->NumParams - 1) * sizeof(float)));
  Feature->Type = FeatureDesc;
  return (Feature);
 

NewFeatureSet()

FEATURE_SET NewFeatureSet

(

int

NumFeatures

)

Allocate and return a new feature set large enough to hold the specified number of features.

Parameters

NumFeatures

maximum # of features to be put in feature set

Returns

New FEATURE_SET.

Definition at line 93 of file ocrfeatures.cpp.

                                           {
  FEATURE_SET FeatureSet;
 
  FeatureSet = static_cast<FEATURE_SET>(Emalloc (sizeof (FEATURE_SET_STRUCT) +
    (NumFeatures - 1) * sizeof (FEATURE)));
  FeatureSet->MaxNumFeatures = NumFeatures;
  FeatureSet->NumFeatures = 0;
  return (FeatureSet);
 

ReadFeatureSet()

FEATURE_SET ReadFeatureSet	(	FILE *	File,
		const FEATURE_DESC_STRUCT *	FeatureDesc
	)

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.

Parameters

File	open text file to read new feature set from
FeatureDesc	specifies type of feature to read from File

Returns

New feature set read from File.

Definition at line 139 of file ocrfeatures.cpp.

                                                                               {
  int NumFeatures;
  ASSERT_HOST(tfscanf(File, "%d", &NumFeatures) == 1);
  ASSERT_HOST(NumFeatures >= 0);
 
  FEATURE_SET FeatureSet = NewFeatureSet(NumFeatures);
  for (int i = 0; i < NumFeatures; i++)
    AddFeature(FeatureSet, ReadFeature(File, FeatureDesc));
 
  return FeatureSet;

WriteFeatureSet()

void WriteFeatureSet	(	FEATURE_SET	FeatureSet,
		STRING *	str
	)

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.

Parameters

FeatureSet	feature set to write to File
str	string to write Feature to

Definition at line 179 of file ocrfeatures.cpp.

                                                          {
  if (FeatureSet) {
    str->add_str_int("", FeatureSet->NumFeatures);
    *str += "\n";
    for (int i = 0; i < FeatureSet->NumFeatures; i++) {
      WriteFeature(FeatureSet->Features[i], str);
    }
  }