/usr/include/tesseract/intfeaturespace.h is in libtesseract-dev 3.02.01-6.
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// Author: rays@google.com (Ray Smith)
///////////////////////////////////////////////////////////////////////
// File: intfeaturespace.h
// Description: Indexed feature space based on INT_FEATURE_STRUCT.
// Created: Wed Mar 24 10:55:30 PDT 2010
//
// 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 TESSERACT_CLASSIFY_INTFEATURESPACE_H__
#define TESSERACT_CLASSIFY_INTFEATURESPACE_H__
#include "genericvector.h"
#include "intproto.h"
// Extent of x,y,theta in the input feature space. [0,255].
const int kIntFeatureExtent = 256;
// Extent of x,y,theta dimensions in the quantized feature space.
const int kBoostXYBuckets = 16;
const int kBoostDirBuckets = 16;
namespace tesseract {
class IndexMap;
// Down-sampling quantization of the INT_FEATURE_STRUCT feature space and
// conversion to a single scalar index value, used as a binary feature space.
class IntFeatureSpace {
public:
IntFeatureSpace();
// Default copy constructors and assignment OK!
// Setup the feature space with the given dimensions.
void Init(uinT8 xbuckets, uinT8 ybuckets, uinT8 thetabuckets);
// Serializes the feature space definition to the given file.
// Returns false on error.
bool Serialize(FILE* fp) const;
// DeSerializes the feature space definition from the given file.
// If swap is true, the data is big/little-endian swapped.
// Returns false on error.
bool DeSerialize(bool swap, FILE* fp);
// Returns the total size of the feature space.
int Size() const {
return static_cast<int>(x_buckets_) * y_buckets_ * theta_buckets_;
}
// Returns an INT_FEATURE_STRUCT corresponding to the given index.
// This is the inverse of the Index member.
INT_FEATURE_STRUCT PositionFromIndex(int index) const;
// Returns a 1-dimensional index corresponding to the given feature value.
// Range is [0, Size()-1]. Inverse of PositionFromIndex member.
int Index(const INT_FEATURE_STRUCT& f) const {
return (XBucket(f.X) * y_buckets_ + YBucket(f.Y)) * theta_buckets_ +
ThetaBucket(f.Theta);
}
// Bulk calls to Index. Maps the given array of features to a vector of
// inT32 indices in the same order as the input.
void IndexFeatures(const INT_FEATURE_STRUCT* features, int num_features,
GenericVector<int>* mapped_features) const;
// Bulk calls to Index. Maps the given array of features to a vector of
// sorted inT32 indices.
void IndexAndSortFeatures(const INT_FEATURE_STRUCT* features,
int num_features,
GenericVector<int>* sorted_features) const;
// Returns a feature space index for the given x,y position in a display
// window, or -1 if the feature is a miss.
int XYToFeatureIndex(int x, int y) const;
protected:
// Converters to generate indices for individual feature dimensions.
int XBucket(int x) const {
int bucket = x * x_buckets_ / kIntFeatureExtent;
return ClipToRange(bucket, 0, static_cast<int>(x_buckets_) - 1);
}
int YBucket(int y) const {
int bucket = y * y_buckets_ / kIntFeatureExtent;
return ClipToRange(bucket, 0, static_cast<int>(y_buckets_) - 1);
}
// Use DivRounded for theta so that exactly vertical and horizontal are in
// the middle of a bucket. The Modulo takes care of the wrap-around.
int ThetaBucket(int theta) const {
int bucket = DivRounded(theta * theta_buckets_, kIntFeatureExtent);
return Modulo(bucket, theta_buckets_);
}
// Returns an INT_FEATURE_STRUCT corresponding to the given buckets.
INT_FEATURE_STRUCT PositionFromBuckets(int x, int y, int theta) const;
// Feature space definition - serialized.
uinT8 x_buckets_;
uinT8 y_buckets_;
uinT8 theta_buckets_;
};
} // namespace tesseract.
#endif // TESSERACT_CLASSIFY_INTFEATURESPACE_H__
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