Forehead deteced

makefile

@@ -1,5 +1,9 @@
 all: ppg
-	g++ ppg.o -o ppg
+	g++ ppg.o -o ppg -L/usr/lib/x86_64-linux-gnu/ -lopencv_stitching -lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_ccalib -lopencv_dnn_objdetect -lopencv_dnn_superres -lopencv_dpm -lopencv_highgui -lopencv_face -lopencv_freetype -lopencv_fuzzy -lopencv_hdf -lopencv_hfs -lopencv_img_hash -lopencv_line_descriptor -lopencv_quality -lopencv_reg -lopencv_rgbd -lopencv_saliency -lopencv_shape -lopencv_stereo -lopencv_structured_light -lopencv_phase_unwrapping -lopencv_superres -lopencv_optflow -lopencv_surface_matching -lopencv_tracking -lopencv_datasets -lopencv_text -lopencv_dnn -lopencv_plot -lopencv_ml -lopencv_videostab -lopencv_videoio -lopencv_viz -lopencv_ximgproc -lopencv_video -lopencv_xobjdetect -lopencv_objdetect -lopencv_calib3d -lopencv_imgcodecs -lopencv_features2d -lopencv_flann -lopencv_xphoto -lopencv_photo -lopencv_imgproc -lopencv_core
 	
 ppg: ppg.cpp
-	g++ -c ppg.cpp
+	g++ -c ppg.cpp -I/usr/include/opencv4/opencv -I/usr/include/opencv4 
+
+clean: 
+	rm *.o
+	rm ppg

ppg.cpp

@@ -1,4 +1,84 @@
+#include "iostream"
+#include "opencv2/opencv.hpp"
+#include "opencv2/videoio.hpp"
+#include "opencv2/highgui.hpp"
+
+int FPS = 15;
+int DISCARD_DURATION = 1;
+
 int main()
 {
+	//-- Face detection
+	cv::CascadeClassifier faceDetector;
+	if( !faceDetector.load("./haarcascade_frontalface_alt.xml"))
+	{
+		std::cerr << "[ERROR] Unable to load face cascade" << std::endl;
+		return -1;
+	}
+		
+	cv::VideoCapture cap;
+	cap.open(0);
+	if (!cap.isOpened())
+	{
+		std::cerr << "[ERROR] Unable to open camera!" << std::endl;
+		return -2;
+	}
+	
+	bool isDiscardData = true;
+	int countDiscard = 0;
+	
+	while (true)
+	{
+		// 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;
+		}
+		
+		
+		
+		if (isDiscardData)
+		{
+			std::cout <<"Discarding" <<std::endl;
+			countDiscard++;
+			if (countDiscard == DISCARD_DURATION*FPS)
+				isDiscardData = false;
+		}
+		else
+		{
+			std::cout <<"Processing" <<std::endl;
+			cv::Mat frame_gray;
+			cv::cvtColor( frame, frame_gray, cv::COLOR_BGR2GRAY );
+			std::vector<cv::Rect> faceRectangles;
+			faceDetector.detectMultiScale(frame_gray, faceRectangles, 1.1, 3, 0, cv::Size(20, 20));
+			cv::Rect foreheadROI;
+			if (faceRectangles.size()>0)
+				
+				foreheadROI = faceRectangles[0];
+				foreheadROI.height *= 0.3;
+				
+				cv::rectangle(frame, foreheadROI, cv::Scalar(0, 0, 255), 1, 1, 0);
+		}
+		
+		
+		cv::imshow("Color", frame);
+			
+		if (cv::waitKey(1000.0/FPS) >= 0)
+			break;
+	}
+	
+	
+	
+	
+	
 	return 0;
 }
+
+