int FACE_RECOGNITION::load_db_faces(void) 
{ 
  intrc = -1; 
  longhFile = 0; 
  struct_finddata_tfileinfo; 
  
  frontal_face_detectordetector =get_frontal_face_detector(); 
  // We will also use a face landmarking model to align faces to a standard pose: (see face_landmark_detection_excpp for an introduction) 
  deserialize("shape_predictor_68_face_landmarksdat") >>sp; 
  
  // And finally we load the DNN responsible for face recognition 
  deserialize("dlib_face_recognition_resnet_model_vdat") >>net; 
  
  if ((hFile =_findfirst("\\faces\\*jpg", &fileinfo)) != -1) 
  { 
    do 
    { 
      if ((fileinfoattrib &_A_ARCH)) 
      { 
        if (strcmp(fileinfoname,"") != 0 && strcmp(fileinfoname,"") != 0) 
        { 
          if (!strcmp(strstr(fileinfoname,"") + 1 , "jpg")) 
          { 
            cout <<"This file is an image file!" <<fileinfoname <<endl; 
            matrix<rgb_pixel>img; 
            charpath[260]; 
            sprintf_s(path,"\\faces\\%s",fileinfoname); 
            load_image(img,path); 
            image_windowwin(img); 
  
            for (autoface :detector(img)) 
            { 
              autoshape =sp(img,face); 
              matrix<rgb_pixel>face_chip; 
              extract_image_chip(img,get_face_chip_details(shape, 150, 25),face_chip); 
              //Record the all this face's information 
              FACE_DESCsigle_face; 
              sigle_faceface_chip =face_chip; 
              sigle_facename =fileinfoname; 
  
              std::vector<matrix<rgb_pixel>>face_chip_vec; 
              std::vector<matrix<float, 0, 1>>face_all; 
  
              face_chip_vecpush_back(move(face_chip)); 
              //Asks the DNN to convert each face image in faces into a 128D vector 
              face_all =net(face_chip_vec); 
  
              //Get the feature of this person 
              std::vector<matrix<float, 0, 1>>::iteratoriter_begin = face_allbegin(), 
                iter_end =face_allend(); 
              if (face_allsize() > 1)break; 
              sigle_faceface_feature = *iter_begin; 
  
              //all the person description into vector 
              face_desc_vecpush_back(sigle_face); 
  
              winadd_overlay(face); 
            } 
          } 
          else 
          { 
            cout <<"This file is not image file!" <<fileinfoname <<endl; 
          }           
        } 
      } 
      else 
      { 
        //filespush_back(passign(path)append("\\")append(fileinfoname)); 
      } 
    } while (_findnext(hFile, &fileinfo) == 0); 
    _findclose(hFile); 
  } 
  returnrc; 
} 

intcapture_face(Matframe,Mat&out)
{
  Matgray;
  Matface;
  intrc = -1;
 
  if (frame.empty() || !frame.data)return -1;
 
  cvtColor(frame,gray,CV_BGR2GRAY);
  int *pResults =NULL;
 
  unsignedchar *pBuffer = (unsignedchar *)malloc(DETECT_BUFFER_SIZE);
  if (!pBuffer)
  {
    fprintf(stderr,"Can not alloc buffer.\n");
    return -1;
  }
  //pResults = facedetect_frontal_tmp((unsigned char*)(gray.ptr(0)), gray.cols, gray.rows, gray.step,
  //  1.2f, 5, 24);
  pResults =facedetect_multiview_reinforce(pBuffer, (unsignedchar*)(gray.ptr(0)),gray.cols,gray.rows, (int)gray.step,
    1.2f, 2, 48, 0, 1);
 
  //printf("%d faces detected.\n", (pResults ? *pResults : 0));//重復(fù)運(yùn)行
                              //print the detection results
  if (pResults !=NULL)
  {
    for (inti = 0;i < (pResults ? *pResults : 0);i++)
    {
      short *p = ((short*)(pResults + 1)) + 6 *i;
      intx =p[0];
      inty =p[1];
      intw =p[2];
      inth =p[3];
      intneighbors =p[4];
 
      Rect_<float>face_rect =Rect_<float>(x,y,w, h);
      face =frame(face_rect);
 
      printf("face_rect=[%d, %d, %d, %d], neighbors=%d\n",x,y, w,h,neighbors);
      Pointleft(x,y);
      Pointright(x +w,y + h);
      cv::rectangle(frame,left,right, Scalar(230, 255, 0), 4);    
    }
    //imshow("frame", frame);
    if (face.empty() || !face.data)
    {
      face_detect_count = 0;
      return -1;
    }
    if (face_detect_count++ > 30)
    {
      imshow("face",face);
      out =face.clone();
      return 0;
    }
  }
  else
  {
    //face is moving, and reset the detect count
    face_detect_count = 0;
  }
 
  returnrc;
}

matrix<rgb_pixel> face_cap;
	//save the capture in the project directory
	load_image(face_cap, ".\\cap.jpg");

	//Display the raw image on the screen
	image_window win1(face_cap);

	frontal_face_detector detector = get_frontal_face_detector();
	std::vector<matrix<rgb_pixel>> vect_faces;

	for (auto face : detector(face_cap))
	{
		auto shape = face_recognize.sp(face_cap, face);
		matrix<rgb_pixel> face_chip;
		extract_image_chip(face_cap, get_face_chip_details(shape, 150, 0.25), face_chip);
		vect_faces.push_back(move(face_chip));
		win1.add_overlay(face);
	}

	if (vect_faces.size() != 1)
	{
		cout <<"Capture face error! face number "<< vect_faces.size() << endl;
		cap.release();
		goto CAPTURE;
	}

	//Use DNN and get the capture face's feature with 128D vector
	std::vector<matrix<float, 0, 1>> face_cap_desc = face_recognize.net(vect_faces);
	//Browse the face feature from the database, and find the match one
	std::pair<double,std::string> candidate_face;
	std::vector<double> len_vec;

	std::vector<std::pair<double, std::string>> candi_face_vec;
	candi_face_vec.reserve(256);

	for (size_t i = 0; i < face_recognize.face_desc_vec.size(); ++i)
	{
		auto len = length(face_cap_desc[0] - face_recognize.face_desc_vec[i].face_feature);
	  if (len < 0.45)
		{
			len_vec.push_back(len);
			candidate_face.first = len;
			candidate_face.second = face_recognize.face_desc_vec[i].name.c_str();
			candi_face_vec.push_back(candidate_face);

#ifdef _FACE_RECOGNIZE_DEBUG
			char buffer[256] = {0};
			sprintf_s(buffer, "Candidate face %s Euclid length %f",
				face_recognize.face_desc_vec[i].name.c_str(),
				len);
			MessageBox(CString(buffer), NULL, MB_YESNO);
#endif
		}
		else
		{
			cout << "This face from database is not match the capture face, continue!" << endl;
		}
	}

	//Find the most similar face
	if (len_vec.size() != 0)
	{
		shellSort(len_vec);

		int i(0);
		for (i = 0; i != len_vec.size(); i++)
		{
			if (len_vec[0] == candi_face_vec[i].first)
				break;
		}

		char buffer[256] = { 0 };
		sprintf_s(buffer, "The face is %s -- Euclid length %f",
			candi_face_vec[i].second.c_str(), candi_face_vec[i].first);
		if (MessageBox(CString(buffer), NULL, MB_YESNO) == IDNO)
		{
			face_record();
		}
	}
	else
	{
		if (MessageBox(CString("Not the similar face been found"), NULL, MB_YESNO) == IDYES)
		{
			face_record();
		}
	}	

	face_detect_count = 0;
	frame.release();
	face.release();	

Mat frame;
	Mat face;
	VideoCapture cap(0);
	if (!cap.isOpened()) {
		AfxMessageBox(_T("Please check your USB camera's interface num."));
	}

	try
	{
		while (1)
		{
			check_close(cap);
			cap >> frame;
			if (!frame.empty())
			{
				if (capture_face(frame, face) == 0)
				{
					//convert to IplImage format and then save with .jpg format
					IplImage face_Img;
					face_Img = IplImage(face);
					//save the capture face to the project directory
					cvSaveImage("./cap.jpg", &face_Img);
					break;
				}
				imshow("view", frame);
			}
	
			int c = waitKey(10);
			if ((char)c == 'c') { break; }
		}
	}
	catch (exception& e)
	{
		cout << "\nexception thrown!" << endl;
		cout << e.what() << endl;
#ifdef _CAPTURE_DEBUG
		MessageBox(CString(e.what()), NULL, MB_YESNO);
#endif
		goto CAPTURE;
	}