#pragma once

#include <opencv2/opencv.hpp>


/*! \file integral_image.h
    \brief The file provides functions that calculate an integral image.
*/



namespace integral_image {


//TODO: The algorithms do not require the data to be of 'double' type.
//Consider to turn functions into template functions.


using Mat = cv::Mat_<double>;

//! A reference serial implementation of the integral image algorithm.
/*!
  \param image an input 1-channel image.
  \return The integral image of the input
  \sa integral_image_openmp
*/
Mat integral_image_serial(const Mat &image);

//! An OpenMP-accelerated function that calculates an integral image.
/*!
  \param image an input 1-channel image.
  \param thread_number number of worker threads. If \p thread_number is equal to 0, the threads are created dynamically. Defaults to 0.
  \return The integral image of the input
  \sa integral_image_serial
*/
Mat integral_image_openmp(const Mat &image, int thread_number = 0);

}