mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-12-05 10:49:01 +08:00
5bc5e2a0b4
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@650 d0cd1f9f-072b-0410-8dd7-cf729c803f20
111 lines
4.3 KiB
C++
111 lines
4.3 KiB
C++
// Copyright 2010 Google Inc. All Rights Reserved.
|
|
// 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__
|