#include <iostream>
#include <opencv2\core.hpp>
#include <opencv2\imgcodecs.hpp>
#include <opencv2\imgproc.hpp>
#include <opencv2\highgui.hpp>

using namespace std;
using namespace cv;

//string image_file = "C:\\Users\\patrik\\Downloads\\kaiser-wilhelm-2176402_640.jpg";
string image_file = "C:\\Users\\patrik\\Downloads\\1489872650_girl.png";

int main()
{
	Mat img = imread(image_file);
	/*imshow("okno", img);

	Vec3b bod = img.at<Vec3b>(0, 0);
	cout << bod << endl;

	waitKey(0);*/
	/*
	float a = 1.2;
	float b = 50;

	// TODO: preco to nejde jas a kontras na kazdom bode
	for (int y = 0; y < img.rows; y++) {
		Vec3b* row = img.ptr<Vec3b>(y);
		for (int x = 0; x < img.cols; x++) {
			Vec3b color = row[x];
			row[x] = Vec3b(255 - color[0], 255 - color[1], 255 - color[2]);
		}
	}

	img *= a;
	img += b;

	imshow("okno", img);
	waitKey(0);

	imwrite("upraveny_jas.jpg", img);*/

	Mat parts[3];
	split(img, parts);
	/*
	imshow("okno", parts[0]);
	waitKey(0);
	imshow("okno", parts[1]);
	waitKey(0);
	imshow("okno", parts[2]);
	waitKey(0);
	
	Mat parts1[] = { parts[2] , parts[1] , parts[0] };
	Mat output;
	merge(parts1, 3, output);
	imshow("okno2", output);
	waitKey(0);
	*/

	Mat gray;
	cvtColor(img, gray, ColorConversionCodes::COLOR_BGR2GRAY);
	imshow("okno2", gray);
	waitKey(0);

	Mat output, mask;

	/*mask = (Mat_<float>(3, 3) << 1, 1, 1, 1, 1, 1, 1, 1, 1);
	mask *= (1.f / 9);
	filter2D(Mat_<float>(gray), output, -1, mask);
	imshow("okno3", Mat_<uchar>(output));
	waitKey(0);


	mask = (Mat_<float>(3, 3) << 0, -1, 0, -1, 5, -1, 0, -1, 0);
	filter2D(Mat_<float>(gray), output, -1, mask);
	imshow("okno4", Mat_<uchar>(output));
	waitKey(0);*/
	/*


	mask = (Mat_<float>(3, 3) << 1, 1, 1, 1, -8, 1, 1, 1, 1);
	filter2D(Mat_<float>(gray), output, -1, mask);
	imshow("okno5", Mat_<uchar>(output));
	waitKey(0);

	Laplacian(gray, output, -1);
	imshow("laplace", output);
	waitKey(0);

	imshow("laplace trehs", output > 127);


	Canny(gray, output, 180, 230);
	imshow("canny", output);
	waitKey(0);
	*/


	Mat maska = gray < 230;
	imshow("maska", maska);
	waitKey(0);

	img.copyTo(output, maska);
	imshow("maska", output);

	waitKey(0);
	return 0;
}