text: /**
   * PS Move API - An interface for the PS Move Motion Controller
   * Copyright (c) 2012 Benjamin Venditti <benjamin.venditti@gmail.com>
   * Copyright (c) 2012 Thomas Perl <m@thp.io>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   *    1. Redistributions of source code must retain the above copyright
   *       notice, this list of conditions and the following disclaimer.
   *
   *    2. Redistributions in binary form must reproduce the above copyright
   *       notice, this list of conditions and the following disclaimer in the
   *       documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   **/
  
  #ifndef TRACKER_HELPERS_H
  #define TRACKER_HELPERS_H
  
  #include "opencv2/core/core_c.h"
  
  #include "psmove.h"
  
  
  /* Color constants */
  #define TH_COLOR_BLACK cvScalar(0, 0, 0, 0)
  #define TH_COLOR_WHITE cvScalar(255, 255, 255, 0)
  #define TH_COLOR_RED cvScalar(0, 0, 255, 0)
  
  /* Distance of 2 CvPoints, squared */
  #define th_dist_squared(a, b) (((a).x - (b).x) * \
                                 ((a).x - (b).x) + \
                                 ((a).y - (b).y) * \
                                 ((a).y - (b).y))
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /**
   * Variance and average of an array of doubles
   *
   * a ... An array of double values (IN)
   * n ... The number of values in a
   * variance ... Variance result (OUT)
   * avg ... Average result (OUT)
   **/
  void
  th_stats(double *a, int n, double *variance, double *avg);
  
  /**
   * Average over all 3 channels of a color
   **/
  double
  th_color_avg(CvScalar a);
  
  /**
   * Sum of two CvScalar values
   **/
  CvScalar
  th_scalar_add(CvScalar a, CvScalar b);
  
  /**
   * Difference of two CvScalar values
   **/
  CvScalar
  th_scalar_sub(CvScalar a, CvScalar b);
  
  
  /**
   * Scaled CvScalar by a constant factor
   **/
  CvScalar
  th_scalar_mul(CvScalar a, double b);
  
  /**
   * Single-value colorspace conversion: BGR -> HSV
   **/
  CvScalar
  th_brg2hsv(CvScalar bgr);
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif // TRACKER_HELPERS_H
  