#include <iostream>
#include "opencv2/opencv.hpp"

using namespace cv;
using namespace std;

void erode_dilate() {
	Mat src = imread("../../resources/images/milkdrop.bmp", IMREAD_GRAYSCALE);
	Mat bin;
	threshold(src, bin, 0, 255, THRESH_BINARY | THRESH_OTSU);

	Mat dst1, dst2;
	erode(bin, dst1, getStructuringElement(MorphShapes::MORPH_CROSS, Size(7, 7)));
	dilate(bin, dst2, getStructuringElement(MorphShapes::MORPH_ELLIPSE, Size(3, 5)));

	imshow("src", src);
	imshow("bin", bin);
	imshow("erode", dst1);
	imshow("dilate", dst2);

	cv::waitKey();
	cv::destroyAllWindows();
}

void open_close() {
	cv::VideoCapture video("../../resources/images/vtest.avi");
	if (!video.isOpened()) {
		std::cerr << "camera.isopened()" << std::endl;
		return;
	}
	cv::Mat src;
	cv::Mat prevSrc;
	double fps = 1000 / video.get(cv::VideoCaptureProperties::CAP_PROP_FPS);
	std::cout << "\n\n" << fps << "\n\n";
	while (true) {
		prevSrc = src;
		video >> src;
		if (src.empty()) {
			std::cerr << "img.empty()" << std::endl;
			return;
		}
		cv::imshow("src", src);
		if (cv::waitKey(fps) == 27)
			break;
	}
	cv::cvtColor(src, src, cv::COLOR_BGR2GRAY);
	src.convertTo(src, CV_8U);

	Mat bin;
	threshold(src, bin, 0, 255, THRESH_BINARY | THRESH_OTSU);

	Mat dst1, dst2, dst3, dst4, dst5;
	morphologyEx(bin, dst1, MORPH_OPEN, Mat());
	morphologyEx(bin, dst2, MORPH_CLOSE, Mat());
	morphologyEx(bin, dst3, MORPH_GRADIENT, Mat());
	Canny(bin, dst4, 30, 127);
	dst5 = std::abs(src - prevSrc);

	imshow("src", src);
	imshow("bin", bin);
	imshow("erode", dst1);
	imshow("dilate", dst2);
	imshow("gradient", dst3);
	imshow("Canny", dst4);

	cv::waitKey();
	cv::destroyAllWindows();
}

int main(int argc, char* argv[]) {
	open_close();
}