71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
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/**********************************************************************
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* File: quadlsq.h (Formerly qlsq.h)
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* Description: Code for least squares approximation of quadratics.
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* Author: Ray Smith
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*
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* (C) Copyright 1993, Hewlett-Packard Ltd.
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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 QUADLSQ_H
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#define QUADLSQ_H
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#include "points.h"
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namespace tesseract {
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class QLSQ {
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public:
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QLSQ() { // constructor
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clear(); // set to zeros
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}
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void clear(); // initialize
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void add( // add element
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double x, // coords to add
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double y);
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void remove( // delete element
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double x, // coords to delete
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double y);
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int32_t count() { // no of elements
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return n;
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}
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void fit( // fit the given
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int degree); // return actual
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double get_a() const { // get x squard
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return a;
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}
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double get_b() const { // get x squard
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return b;
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}
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double get_c() const { // get x squard
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return c;
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}
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private:
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int32_t n; // no of elements
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double a, b, c; // result
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double sigx; // sum of x
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double sigy; // sum of y
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double sigxx; // sum x squared
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double sigxy; // sum of xy
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double sigyy; // sum y squared
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long double sigxxx; // sum x cubed
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long double sigxxy; // sum xsquared y
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long double sigxxxx; // sum x fourth
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};
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} // namespace tesseract
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#endif
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