histogram.h File Reference

Header file for calculating and fitting histograms. More...

#include "simplex.h"
#include "Bplot.h"

Functions
vector< long >	histogram (vector< double > data, long bins, double &scale, double &offset)
	Calculates the histogram froma data array. More...
Bplot *	plot_convert_to_histogram (Bplot *plot, long bins, long hiscol)
vector< double >	histogram_thresholds (vector< long > h, long number)
	Calculates multiple thresholds from a histogram. More...
double	histogram_gaussian_R (Bsimplex &simp)
int	plot_histogram_fit (Bplot *plot, long ngauss)
	Fits a gaussian function to a histogram and plots it. More...

Detailed Description

Header file for calculating and fitting histograms.

Author

Bernard Heymann

Date

Created: 19990321

Modified: 20221004

Function Documentation

histogram()

vector< long > histogram	(	vector< double >	data,
		long	bins,
		double &	scale,
		double &	offset
	)

Calculates the histogram froma data array.

Parameters

data	vector of data.
bins	number of bins in the histogram.
&scale	scale.
&offset	offset.

Returns

vector<long> histogram.

A histogram of an image is calculated with a given number of bins.
Multiple channels are output as successive one-dimensional arrays.
The image data is not affected.
The statistics for the input image must be correctly calculated.

histogram_gaussian_R()

double histogram_gaussian_R

(

Bsimplex &

simp

)

histogram_thresholds()

vector< double > histogram_thresholds	(	vector< long >	h,
		long	number
	)

Calculates multiple thresholds from a histogram.

Parameters

h	histogram.
number	number of clusters (one more than thresholds).

Returns

vector<double> thresholds.

Reference: PS.Liao, TS.Chen, and PC. Chung,
       Journal of Information Science and Engineering, vol 17, 713-727 (2001)

plot_convert_to_histogram()

Bplot * plot_convert_to_histogram	(	Bplot *	plot,
		long	bins,
		long	hiscol
	)

plot_histogram_fit()

int plot_histogram_fit	(	Bplot *	plot,
		long	ngauss
	)

Fits a gaussian function to a histogram and plots it.

Parameters

plot	histogram plot.
ngauss	number of gaussians.

Returns

int 0.

One or more gaussians are fit to a histogram plot.
The gaussian curves are added to columns.