NICE_Segmentation/felzenszwalb/misc.h

/*
Copyright (C) 2006 Pedro Felzenszwalb

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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
*/

/* random stuff */

#ifndef MISC_H
#define MISC_H

#include <cmath>

#ifndef M_PI
#define M_PI 3.141592653589793
#endif

namespace felzenszwalb{

typedef unsigned char uchar;

typedef struct { uchar r, g, b; } rgb;

inline bool operator==(const rgb &a, const rgb &b) {
  return ((a.r == b.r) && (a.g == b.g) && (a.b == b.b));
}

template <class T>
inline T abs(const T &x) { return (x > 0 ? x : -x); };

template <class T>
inline int sign(const T &x) { return (x >= 0 ? 1 : -1); };

template <class T>
inline T square(const T &x) { return x*x; };

template <class T>
inline T bound(const T &x, const T &min, const T &max) {
  return (x < min ? min : (x > max ? max : x));
}

template <class T>
inline bool check_bound(const T &x, const T&min, const T &max) {
  return ((x < min) || (x > max));
}

inline int vlib_round(float x) { return (int)(x + 0.5F); }

inline int vlib_round(double x) { return (int)(x + 0.5); }

inline double gaussian(double val, double sigma) {
  return exp(-square(val/sigma)/2)/(sqrt(2*M_PI)*sigma);
}

}//namespace

#endif