Merge branch 'main' into Signal2

makefile

@@ -0,0 +1,7 @@
+all: ppg
+	g++ ppg.o -o ppg.exe -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 -I/usr/include/opencv4/opencv -I/usr/include/opencv4
+clean:
+	rm *.o
+	rm *.exe

ppg.cpp

@@ -1,7 +1,53 @@
-#include <iostream>
-using namespace std;
+
+#include "opencv2/opencv.hpp"
+#include "opencv2/videoio.hpp"
+#include "opencv2/highgui.hpp"
+
+const int FPS = 30;
+
+
+bool isDiscardData = true;
+int countDiscard = 0;
+const int DISCARD_DURATION = 10;
 
 int main() {
-  cout << "Hello World!";
-  return 0;
-} 
+  cv::VideoCapture cap;
+  cap.open(0);
+  cv::CascadeClassifier faceDetector;
+  if( !faceDetector.load("./haarcascade_frontalface_alt.xml"))
+  {
+  std::cerr << "[ERROR] Unable to load face cascade" << std::endl;
+  return -1;
+  };
+  cv::Rect foreheadROI;
+  if (!cap.isOpened()) {
+    std::cerr << "[ERROR] Unable to open camera!" << std::endl;
+    return -2;
+  }
+
+  while (true) {
+    if(isDiscardData){
+       countDiscard++;
+       if(countDiscard == DISCARD_DURATION*FPS)
+           isDiscardData = false;
+       }
+    else{
+       cv::Mat frame;
+       cap.read(frame);
+       if (frame.empty()) {
+          std::cerr << "[ERROR] blank frame grabbed" << std::endl;
+          break;
+       }
+       std::vector<cv::Rect> faceRectangles;
+       faceDetector.detectMultiScale(frame, faceRectangles, 1.1, 3, 0,cv::Size(20, 20));
+       foreheadROI = faceRectangles[0];
+       foreheadROI.height *= 0.3;
+       cv::rectangle(frame, faceRectangles[0], cv::Scalar(0, 0, 255), 1, 1, 0);
+       cv::rectangle(frame, foreheadROI, cv::Scalar(0, 255, 0), 1, 1, 0);       
+       cv::imshow("Color", frame);
+       if (cv::waitKey(1000.0 / FPS) >= 0)
+           break;
+       }
+    }
+    return 0;
+}