tesseract  5.0.0
quadlsq.h
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1 /**********************************************************************
2  * File: quadlsq.h (Formerly qlsq.h)
3  * Description: Code for least squares approximation of quadratics.
4  * Author: Ray Smith
5  *
6  * (C) Copyright 1993, Hewlett-Packard Ltd.
7  ** Licensed under the Apache License, Version 2.0 (the "License");
8  ** you may not use this file except in compliance with the License.
9  ** You may obtain a copy of the License at
10  ** http://www.apache.org/licenses/LICENSE-2.0
11  ** Unless required by applicable law or agreed to in writing, software
12  ** distributed under the License is distributed on an "AS IS" BASIS,
13  ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  ** See the License for the specific language governing permissions and
15  ** limitations under the License.
16  *
17  **********************************************************************/
18 
19 #ifndef QUADLSQ_H
20 #define QUADLSQ_H
21 
22 #include "points.h"
23 
24 namespace tesseract {
25 
26 class QLSQ {
27 public:
28  QLSQ() { // constructor
29  clear(); // set to zeros
30  }
31  void clear(); // initialize
32 
33  void add( // add element
34  double x, // coords to add
35  double y);
36  void remove( // delete element
37  double x, // coords to delete
38  double y);
39  int32_t count() { // no of elements
40  return n;
41  }
42 
43  void fit( // fit the given
44  int degree); // return actual
45  double get_a() const { // get x squard
46  return a;
47  }
48  double get_b() const { // get x squard
49  return b;
50  }
51  double get_c() const { // get x squard
52  return c;
53  }
54 
55 private:
56  int32_t n; // no of elements
57  double a, b, c; // result
58  double sigx; // sum of x
59  double sigy; // sum of y
60  double sigxx; // sum x squared
61  double sigxy; // sum of xy
62  double sigyy; // sum y squared
63  long double sigxxx; // sum x cubed
64  long double sigxxy; // sum xsquared y
65  long double sigxxxx; // sum x fourth
66 };
67 
68 } // namespace tesseract
69 
70 #endif
void fit(int degree)
Definition: quadlsq.cpp:100
void clear()
Definition: quadlsq.cpp:37
void remove(double x, double y)
Definition: quadlsq.cpp:76
double get_a() const
Definition: quadlsq.h:45
double get_b() const
Definition: quadlsq.h:48
double get_c() const
Definition: quadlsq.h:51
void add(double x, double y)
Definition: quadlsq.cpp:58
int32_t count()
Definition: quadlsq.h:39