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git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@138 d0cd1f9f-072b-0410-8dd7-cf729c803f20
85 lines
3.3 KiB
C++
85 lines
3.3 KiB
C++
/**********************************************************************
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* File: lmedsq.h (Formerly lms.h)
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* Description: Code for the LMS class.
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* Author: Ray Smith
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* Created: Fri Aug 7 09:30:53 BST 1992
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*
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* (C) Copyright 1992, 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 LMEDSQ_H
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#define LMEDSQ_H
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#include "points.h"
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#include "varable.h"
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#include "scrollview.h"
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#include "notdll.h"
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class LMS
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{
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public:
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LMS( //constructor
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INT32 size); //no of samples
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~LMS (); //destructor
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void clear(); //clear samples
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void add( //add sample
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FCOORD sample); //sample coords
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void fit( //generate fit
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float &m, //output line
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float &c);
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void constrained_fit( //fixed gradient
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float fixed_m, //forced gradient
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float &out_c); //output line
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void fit_quadratic( //easy quadratic
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float outlier_threshold, //min outlier
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double &a, //x squared
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float &b, //x
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float &c); //constant
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void plot( //plot fit
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ScrollView* win, //window
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ScrollView::Color colour); //colour to draw in
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float error() { //get error
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return fitted ? line_error : -1;
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}
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private:
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void pick_line( //random choice
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float &m, //output line
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float &c);
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void pick_quadratic( //random choice
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double &a, //output curve
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float &b,
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float &c);
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void compute_errors( //find errors
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float m, //from line
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float c);
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//find errors
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float compute_quadratic_errors(float outlier_threshold, //min outlier
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double a, //from curve
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float m,
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float c);
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BOOL8 fitted; //line parts valid
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INT32 samplesize; //max samples
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INT32 samplecount; //current sample size
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FCOORD *samples; //array of samples
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float *errors; //error distances
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double a; //x squared
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float m; //line gradient
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float c;
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float line_error; //error of fit
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};
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extern INT_VAR_H (lms_line_trials, 12, "Number of linew fits to do");
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#endif
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