使用C ++ Opencv 4.4.0算法进行人脸识别时遇到的问题是从数据集而不是从网络摄像头读取帧

编程问答 2022-08-13

问题描述

我曾经对C ++和Opencv 4.4.0算法进行一些修改以进行人脸识别...我使用的是Microsoft Visual Studio ...首先，该算法分两步执行人脸识别：第一个是ADDING_FACE（）函数可在检测到对象的面部之后使用摄像头捕获帧，然后训练 EIGENFACETRAINER（）函数，以便 FACE_RECOGNITION（）函数可以使用此功能识别对象模型（ eigenfacerecognizer ）（步骤2）...这是原始代码的链接：https://github.com/ssj-ali/Face-Detection-Recognition ....

因此，我不想从网络摄像头获取帧，而是想使用已经存在许多引用许多主题的jpg图像的数据集，因此我尝试使用CSV文件，该文件在DATASET中保存了每个图像的路径（YALE FACE DATABASE B）和每个图像的标签，如下所示：

C:\yalefaces\TrainingSet\subject01happy.jpg;0
C:\yalefaces\TrainingSet\subject01leftlight.jpg;0
C:\yalefaces\TrainingSet\subject01noglasses.jpg;0
      .
      .
      .
C:\yalefaces\TrainingSet\subject02happy.jpg;1
C:\yalefaces\TrainingSet\subject02leftlight.jpg;1
C:\yalefaces\TrainingSet\subject02noglasses.jpg;1

当我尝试将保存该csv文件路径的字符串传递给 read_CSV（）函数时，出现一个错误，提示我提出了错误的论点....这是我在 FaceRec.h 文件

中所做的修改 
static void read_csv(const string& filename,vector<Mat>& images,vector<int>& labels,char separator = ';') {
  cout << filename << endl;
  std::ifstream file(filename.c_str(),ifstream::in);
  if (!file) {
      string error_message = "No valid input file was given,please check the given filename.";
      CV_Error(Error::StsBadArg,error_message);
  }
  string line,path,classlabel;
  while (getline(file,line)) {
      stringstream liness(line);
      getline(liness,separator);
      getline(liness,classlabel);
      if (!path.empty() && !classlabel.empty()) {
          images.push_back(imread(path,0));
          labels.push_back(atoi(classlabel.c_str()));
      }
  }
}
void addFace()
{
  //cout << "\nEnter Your Name:  ";
  //cin >> name;

  //VideoCapture capture(0);

 // if (!capture.isOpened())  
     // return ;


  //cout << "\nCapturing your face 10 times,Press 'C' 10 times keeping your face front of the camera";

  // Get the path to your CSV.
  string const fn_csv("E:\\CSV\\Sample.csv");


  
  // These vectors hold the images and corresponding labels.
  vector<Mat> images;
  vector<int> labels;

  // Read in the data. This can fail if no valid
  // input filename is given.
  try {
      read_csv(fn_csv,images,labels);
  }
  catch (const cv::Exception& e) {
      cerr << "Error opening file \"" << fn_csv << "\". Reason: " << e.msg << endl;
      // nothing more we can do
      exit(1);
  }
  // Quit if there are not enough images for this demo.
  if (images.size() <= 1) {
      string error_message = "This demo needs at least 2 images to work. Please add more images to your data set!";
      CV_Error(Error::StsError,error_message);
  }
  // Get the height from the first image. We'll need this
  // later in code to reshape the images to their original
  // size:
  int height = images[0].rows;
.......

此open_vv库文档https://docs.opencv.org/master/da/d60/tutorial_face_main.html中已实现的read_csv（）函数

所以我遇到了这个错误：

OpenCV(4.4.0-dev) Error: Bad argument (No valid input file was given,please check the given filename.) in read_csv,file c:\users\ayoub\music\face-detection-recognition-master\project1c++\facerec.h,line 52
Error opening file "E:\CSV\Sample.csv". Reason: OpenCV(4.4.0-dev) c:\users\ayoub\music\face-detection-recognition-master\project1c++\facerec.h:52: error: (-5:Bad argument) No valid input file was given,please check the given filename. in function 'read_csv'

您能帮我解决这个问题吗，我也想知道这种方法是否有用..否则，如果您可以建议我另一种方法进行修改，我将不胜感激

解决方法

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c++csvcsvcsvface-recognitionopencvopencvvisual-studio-2010