tesseract  v4.0.0-17-g361f3264
Open Source OCR Engine
quadlsq.h
1 /**********************************************************************
2  * File: quadlsq.h (Formerly qlsq.h)
3  * Description: Code for least squares approximation of quadratics.
4  * Author: Ray Smith
5  * Created: Wed Oct 6 15:14:23 BST 1993
6  *
7  * (C) Copyright 1993, Hewlett-Packard Ltd.
8  ** Licensed under the Apache License, Version 2.0 (the "License");
9  ** you may not use this file except in compliance with the License.
10  ** You may obtain a copy of the License at
11  ** http://www.apache.org/licenses/LICENSE-2.0
12  ** Unless required by applicable law or agreed to in writing, software
13  ** distributed under the License is distributed on an "AS IS" BASIS,
14  ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  ** See the License for the specific language governing permissions and
16  ** limitations under the License.
17  *
18  **********************************************************************/
19 
20 #ifndef QUADLSQ_H
21 #define QUADLSQ_H
22 
23 #include "points.h"
24 
25 class QLSQ
26 {
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() { //get x squard
46  return a;
47  }
48  double get_b() { //get x squard
49  return b;
50  }
51  double get_c() { //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 #endif
void add(double x, double y)
Definition: quadlsq.cpp:56
double sigy
Definition: quadlsq.h:59
long double sigxxx
Definition: quadlsq.h:63
double get_b()
Definition: quadlsq.h:48
double get_c()
Definition: quadlsq.h:51
long double sigxxy
Definition: quadlsq.h:64
void fit(int degree)
Definition: quadlsq.cpp:100
double a
Definition: quadlsq.h:57
int32_t count()
Definition: quadlsq.h:39
double c
Definition: quadlsq.h:57
double sigx
Definition: quadlsq.h:58
int32_t n
Definition: quadlsq.h:56
double b
Definition: quadlsq.h:57
double get_a()
Definition: quadlsq.h:45
double sigxy
Definition: quadlsq.h:61
Definition: quadlsq.h:25
double sigxx
Definition: quadlsq.h:60
long double sigxxxx
Definition: quadlsq.h:65
void clear()
Definition: quadlsq.cpp:34
QLSQ()
Definition: quadlsq.h:28
double sigyy
Definition: quadlsq.h:62