Tesseract 3.02

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Public Member Functions
tesseract::IntFeatureDist Class Reference

`#include <intfeaturedist.h>`

List of all members.

## Public Member Functions
| IntFeatureDist ()
| ~IntFeatureDist ()
void | Init (const IntFeatureMap *feature_map)
void | Set (const GenericVector< int > &indexed_features, int canonical_count, bool value)
double | FeatureDistance (const GenericVector< int > &features) const
double | DebugFeatureDistance (const GenericVector< int > &features) const

## Detailed Description

Definition at line 39 of file intfeaturedist.h.

## Constructor & Destructor Documentation

tesseract::IntFeatureDist::IntFeatureDist | ( |  | ) |

Definition at line 25 of file intfeaturedist.cpp.

: size_(0), total_feature_weight_(0.0),
feature_map_(NULL), features_(NULL),
features_delta_one_(NULL), features_delta_two_(NULL) {
}

tesseract::IntFeatureDist::~IntFeatureDist | ( |  | ) |

Definition at line 31 of file intfeaturedist.cpp.

{
Clear();
}

## Member Function Documentation

double tesseract::IntFeatureDist::DebugFeatureDistance | ( | const GenericVector< int > & | features | ) | const

Definition at line 98 of file intfeaturedist.cpp.

{
int num_test_features = features.size();
double denominator = total_feature_weight_ + num_test_features;
double misses = denominator;
for (int i = 0; i < num_test_features; ++i) {
int index = features[i];
double weight = 1.0;
INT_FEATURE_STRUCT f = feature_map_->InverseMapFeature(features[i]);
tprintf("Testing feature weight %g:", weight);
f.print();
if (features_[index]) {
// A perfect match.
misses -= 2.0 * weight;
tprintf("Perfect hit\n");
} else if (features_delta_one_[index]) {
misses -= 1.5 * weight;
tprintf("-1 hit\n");
} else if (features_delta_two_[index]) {
// A near miss.
misses -= 1.0 * weight;
tprintf("-2 hit\n");
} else {
tprintf("Total miss\n");
}
}
tprintf("Features present:");
for (int i = 0; i < size_; ++i) {
if (features_[i]) {
INT_FEATURE_STRUCT f = feature_map_->InverseMapFeature(i);
f.print();
}
}
tprintf("\nMinus one features:");
for (int i = 0; i < size_; ++i) {
if (features_delta_one_[i]) {
INT_FEATURE_STRUCT f = feature_map_->InverseMapFeature(i);
f.print();
}
}
tprintf("\nMinus two features:");
for (int i = 0; i < size_; ++i) {
if (features_delta_two_[i]) {
INT_FEATURE_STRUCT f = feature_map_->InverseMapFeature(i);
f.print();
}
}
tprintf("\n");
return misses / denominator;
}

double tesseract::IntFeatureDist::FeatureDistance | ( | const GenericVector< int > & | features | ) | const

Definition at line 75 of file intfeaturedist.cpp.

{
int num_test_features = features.size();
double denominator = total_feature_weight_ + num_test_features;
double misses = denominator;
for (int i = 0; i < num_test_features; ++i) {
int index = features[i];
double weight = 1.0;
if (features_[index]) {
// A perfect match.
misses -= 2.0 * weight;
} else if (features_delta_one_[index]) {
misses -= 1.5 * weight;
} else if (features_delta_two_[index]) {
// A near miss.
misses -= 1.0 * weight;
}
}
return misses / denominator;
}

void tesseract::IntFeatureDist::Init | ( | const IntFeatureMap * | feature_map | ) |

Definition at line 36 of file intfeaturedist.cpp.

{
size_ = feature_map->sparse_size();
Clear();
feature_map_ = feature_map;
features_ = new bool[size_];
features_delta_one_ = new bool[size_];
features_delta_two_ = new bool[size_];
memset(features_, false, size_ * sizeof(features_[0]));
memset(features_delta_one_, false, size_ * sizeof(features_delta_one_[0]));
memset(features_delta_two_, false, size_ * sizeof(features_delta_two_[0]));
total_feature_weight_ = 0.0;
}

void tesseract::IntFeatureDist::Set | ( | const GenericVector< int > & | indexed_features,
|  | int | canonical_count,
|  | bool | value
| ) |  |

Definition at line 51 of file intfeaturedist.cpp.

{
total_feature_weight_ = canonical_count;
for (int i = 0; i < indexed_features.size(); ++i) {
int f = indexed_features[i];
features_[f] = value;
for (int dir = -kNumOffsetMaps; dir <= kNumOffsetMaps; ++dir) {
if (dir == 0) continue;
int mapped_f = feature_map_->OffsetFeature(f, dir);
if (mapped_f >= 0) {
features_delta_one_[mapped_f] = value;
for (int dir2 = -kNumOffsetMaps; dir2 <= kNumOffsetMaps; ++dir2) {
if (dir2 == 0) continue;
int mapped_f2 = feature_map_->OffsetFeature(mapped_f, dir2);
if (mapped_f2 >= 0)
features_delta_two_[mapped_f2] = value;
}
}
}
}
}

The documentation for this class was generated from the following files:

- /mnt/data/src/tesseract-ocr/classify/intfeaturedist.h
- /mnt/data/src/tesseract-ocr/classify/intfeaturedist.cpp