Added 4.2.2

ppg.cpp

@@ -1,9 +1,61 @@
 //C++
 
 #include <iostream>
+//include those opencv2 files in our program
+#include "opencv2/opencv.hpp"
+#include "opencv2/videoio.hpp" 
+#include "opencv2/highgui.hpp"
+
+int FPS=30; //FPS variable. FPS is the framerate of your video, aka your recording device's
+int DISCARD_DURATION=5;
+bool isDiscardData=true;
+int countDiscard=0;
 
 int main(){ 
 	//Print "PPG algorithm" to terminal
+	//Note to self: std::endl; returns to line in terminal; use it everytime when done printing something.
 	std::cout << "PPG algorithm"<< std::endl;
-	return 0;
+	
+	cv::VideoCapture cap;
+	cap.open(0);
+	if (!cap.isOpened())
+	{
+		//Check if we can access the camera
+		std::cerr<<"[ERROR] unable to open camera!"<<std::endl;
+		return -2;
 	}
+		
+	while (true)
+	{
+		if(isDiscardData)
+		{
+			countDiscard++;
+			if (countDiscard == DISCARD_DURATION*FPS)
+			{
+				isDiscardData=false;
+			}
+		}
+		else
+		{
+			//Create a matrix to store the image from the cam
+			cv::Mat frame;
+			//Wait for a new frame from camera and store it into "frame"
+			cap.read(frame);
+		
+			//Check if we succeeded
+			if (frame.empty())
+			{
+				std::cerr<<"[ERROR] Blank frame grabbed"<<std::endl;
+				break;
+			}
+			cv::imshow("Color", frame);
+			
+			if (cv::waitKey(1000.0/FPS)>=0)
+			{ 
+			break;
+
+			}
+		}
+	}	
+}
+