tesseract/ccstruct/lmedsq.h
2008-02-01 00:36:18 +00:00

85 lines
3.3 KiB
C++

/**********************************************************************
* File: lmedsq.h (Formerly lms.h)
* Description: Code for the LMS class.
* Author: Ray Smith
* Created: Fri Aug 7 09:30:53 BST 1992
*
* (C) Copyright 1992, Hewlett-Packard Ltd.
** 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 LMEDSQ_H
#define LMEDSQ_H
#include "points.h"
#include "varable.h"
#include "scrollview.h"
#include "notdll.h"
class LMS
{
public:
LMS( //constructor
INT32 size); //no of samples
~LMS (); //destructor
void clear(); //clear samples
void add( //add sample
FCOORD sample); //sample coords
void fit( //generate fit
float &m, //output line
float &c);
void constrained_fit( //fixed gradient
float fixed_m, //forced gradient
float &out_c); //output line
void fit_quadratic( //easy quadratic
float outlier_threshold, //min outlier
double &a, //x squared
float &b, //x
float &c); //constant
void plot( //plot fit
ScrollView* win, //window
ScrollView::Color colour); //colour to draw in
float error() { //get error
return fitted ? line_error : -1;
}
private:
void pick_line( //random choice
float &m, //output line
float &c);
void pick_quadratic( //random choice
double &a, //output curve
float &b,
float &c);
void compute_errors( //find errors
float m, //from line
float c);
//find errors
float compute_quadratic_errors(float outlier_threshold, //min outlier
double a, //from curve
float m,
float c);
BOOL8 fitted; //line parts valid
INT32 samplesize; //max samples
INT32 samplecount; //current sample size
FCOORD *samples; //array of samples
float *errors; //error distances
double a; //x squared
float m; //line gradient
float c;
float line_error; //error of fit
};
extern INT_VAR_H (lms_line_trials, 12, "Number of linew fits to do");
#endif