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/***************************************************************************
* ho_array_hist.c
*
* Fri Aug 12 20:13:33 2005
* Copyright 2005-2008 Yaacov Zamir
* <kzamir@walla.co.il>
****************************************************************************/
/*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#ifndef TRUE
#define TRUE -1
#endif
#ifndef FALSE
#define FALSE 0
#endif
#ifndef NULL
#define NULL ((void*)0)
#endif
#include "ho_array_hist.h"
#define square(x) ((x)*(x))
/**
new ho_array_hist
@param size the number of buckets in the histogram
@return newly allocated ho_array
*/
ho_array_hist *
ho_array_hist_new (const int size)
{
int x;
ho_array_hist *hist = NULL;
/*
* allocate memory for histogram
*/
hist = (ho_array_hist *) malloc (sizeof (ho_array));
if (!hist)
{
return NULL;
}
/*
* set header
*/
hist->size = size;
/*
* allocate memory for data
*/
hist->data = malloc (hist->size * sizeof (double));
if (!(hist->data))
{
free (hist);
return NULL;
}
/* init value to 0 */
for (x = 0; x < hist->size; x++)
{
(hist->data)[x] = 0.0;
}
return hist;
}
/**
free an ho_array_hist
@param hist pointer to an ho_array_hist
@return FALSE
*/
int
ho_array_hist_free (ho_array_hist * hist)
{
if (!hist)
return TRUE;
if (hist->data)
free (hist->data);
free (hist);
return FALSE;
}
/**
calculate ho_array_hist from ho_array
@param hist the histogram to init
@param ar the ho_array to use
@return FALSE
*/
unsigned char
ho_array_hist_init (ho_array_hist * hist, const ho_array * ar)
{
int i, x, y;
double min, max, range;
/* get min max values */
ho_array_minmax (ar, &min, &max);
range = max - min;
/* calc accum hist */
for (x = 0; x < ar->width; x++)
for (y = 0; y < ar->height; y++)
{
i =
(int) ((hist->size - 1) * ((ar->data)[x + y * ar->width] -
min) / range);
((hist->data)[i])++;
}
/* normelize hist */
for (i = 0; i < hist->size; i++)
((hist->data)[i]) /= (double) (ar->width * ar->height);
return FALSE;
}
/**
new ho_array_hist
@param size the number of buckets in the histogram
@param ar the ho_array to use
@return newly allocated ho_array
*/
ho_array_hist *
ho_array_hist_new_from_array (const int size, const ho_array * ar)
{
ho_array_hist *hist = NULL;
hist = ho_array_hist_new (size);
if (!hist)
return NULL;
ho_array_hist_init (hist, ar);
return hist;
}
/**
get data from a ho_array_hist
@param hist pointer to a ho_array_hist
@param i the bucket index
@return the value of the histogram
*/
double
ho_array_hist_get_at (const ho_array_hist * hist, int i)
{
return hist->data[i];
}
/**
new ho_array from ho_array_hist
@param hist pointer to an ho_array_hist
@return newly allocated ho_array
*/
ho_array *
ho_array_hist_to_array (const ho_array_hist * hist)
{
int x, y;
ho_array *m_out = NULL;
/* allocate memory */
m_out = ho_array_new (hist->size, hist->size);
if (!m_out)
return NULL;
/* copy data */
for (x = 0; x < hist->size; x++)
{
y = (int) ((double) hist->size * hist->data[x]);
ho_array_set (m_out, x, y, 1.0);
}
return m_out;
}
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