69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
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#include "opencv2/opencv.hpp"
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#include "opencv2/videoio.hpp"
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#include "opencv2/highgui.hpp"
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const int FPS = 30;
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bool isDiscardData = true;
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int countDiscard = 0;
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const int DISCARD_DURATION = 10;
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const int BUFFER_DURATION = 60;
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int main() {
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cv::VideoCapture cap;
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cap.open(0);
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cv::CascadeClassifier faceDetector;
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if( !faceDetector.load("./haarcascade_frontalface_alt.xml"))
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{
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std::cerr << "[ERROR] Unable to load face cascade" << std::endl;
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return -1;
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};
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cv::Rect foreheadROI;
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if (!cap.isOpened()) {
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std::cerr << "[ERROR] Unable to open camera!" << std::endl;
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return -2;
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}
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while (true) {
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if(isDiscardData){
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countDiscard++;
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if(countDiscard == DISCARD_DURATION*FPS)
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isDiscardData = false;
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}
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else{
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cv::Mat frame;
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cap.read(frame);
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if (frame.empty()) {
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std::cerr << "[ERROR] blank frame grabbed" << std::endl;
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break;
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}
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std::vector<cv::Rect> faceRectangles;
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faceDetector.detectMultiScale(frame, faceRectangles, 1.1, 3, 0,cv::Size(20, 20));
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foreheadROI = faceRectangles[0];
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foreheadROI.height *= 0.3;
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cv::Mat frame_forehead = frame(foreheadROI);
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cv::Scalar avg_forehead = mean(frame_forehead);
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bool isBufferFull = false;
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int sampleIdBuffer = 0;
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cv::Mat greenSignal(1, FPS*BUFFER_DURATION, CV_64F);
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if (!isBufferFull)
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{
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greenSignal.at<double>(0, sampleIdBuffer) = avg_forehead[1] ;
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sampleIdBuffer++;
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if (sampleIdBuffer == FPS*BUFFER_DURATION)
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{
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isBufferFull = true;
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}
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}
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cv::rectangle(frame, faceRectangles[0], cv::Scalar(0, 0, 255), 1, 1, 0);
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cv::rectangle(frame, foreheadROI, cv::Scalar(0, 255, 0), 1, 1, 0);
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cv::imshow("Color", frame);
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if (cv::waitKey(1000.0 / FPS) >= 0)
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break;
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}
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}
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return 0;
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}
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