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