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我的目标是使用我的网络摄像头捕捉我的脸并通过面部表情检测我的情绪。输出应该是概率，比如 70% 快乐，10% 悲伤，......

我的方法：非常高兴和非常悲伤（和其他状态）的面孔应该保存在 HaarCascade 中。

我的问题有两个：

  1. 如何创建一个 HaarCascade 与 HaarObjectDetector 一起使用，以便 HaarObjectDetector 对象在超过阈值时输出百分比而不是输出“真”？
  2. 如何为 HaarCascade 创建 HaarCascade？String path = @"C:\Users\haarcascade-frontalface_alt2.xml"; HaarCascade cascade1 = HaarCascade.FromXml(path);使用opencv-xml更容易还是使用生成它更容易HaarCascade m = new HaarCascade(20,20,HaarCascadeStages);？HaarCascadeStages 会是什么？

其他人是否已经解决了这个问题并提供了 c# 的源代码？

我当前的代码：

public partial class Form1 : Form
{
    private bool DeviceExist = false;
    private FilterInfoCollection videoDevices;
    private VideoCaptureDevice videoSource = null;
    Bitmap picture;

    HaarObjectDetector detector;
    FaceHaarCascade cascade;

    public Form1()
    {
        InitializeComponent();
    }

    // get the devices name
    private void getCamList()
    {
        try
        {
            videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
            comboBox1.Items.Clear();
            if (videoDevices.Count == 0)
                throw new ApplicationException();

            DeviceExist = true;
            foreach (FilterInfo device in videoDevices)
            {
                comboBox1.Items.Add(device.Name);
            }
            comboBox1.SelectedIndex = 0; //make dafault to first cam
        }
        catch (ApplicationException)
        {
            DeviceExist = false;
            comboBox1.Items.Add("No capture device on your system");
        }
    }


    //toggle start and stop button
    private void start_Click(object sender, EventArgs e)
    {

    }

    //eventhandler if new frame is ready
    private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
    {
        picture = (Bitmap)eventArgs.Frame.Clone();
        //Rectangle[] objects = detector.ProcessFrame(picture);
        //if (objects.Length > 0)
        //{
        //    RectanglesMarker marker = new RectanglesMarker(objects, Color.Fuchsia);
        //    pictureBox1.Image = marker.Apply(picture);
        //}
        pictureBox1.Image = picture;

    }

    //close the device safely
    private void CloseVideoSource()
    {
        if (!(videoSource == null))
            if (videoSource.IsRunning)
            {
                videoSource.SignalToStop();
                videoSource = null;
            }
    }

    //get total received frame at 1 second tick
    private void timer1_Tick(object sender, EventArgs e)
    {
        label2.Text = "Device running... " + videoSource.FramesReceived.ToString() + " FPS";
    }

    //prevent sudden close while device is running
    private void Form1_FormClosed(object sender, FormClosedEventArgs e)
    {
        CloseVideoSource();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        getCamList();
        cascade = new FaceHaarCascade();
        detector = new HaarObjectDetector(cascade, 30);
        detector.SearchMode = ObjectDetectorSearchMode.Average;
        detector.ScalingFactor = 1.5f;
        detector.ScalingMode = ObjectDetectorScalingMode.GreaterToSmaller;
        detector.UseParallelProcessing = false;
        detector.Suppression = 2;
    }

    private void rfsh_Click_1(object sender, EventArgs e)
    {

    }

    private void start_Click_1(object sender, EventArgs e)
    {
        if (start.Text == "Start")
        {
            if (DeviceExist)
            {
                videoSource = new VideoCaptureDevice(videoDevices[comboBox1.SelectedIndex].MonikerString);
                videoSource.NewFrame += new NewFrameEventHandler(video_NewFrame);
                CloseVideoSource();
                videoSource.DesiredFrameSize = new Size(640, 480);
                //videoSource.DesiredFrameRate = 10;
                videoSource.Start();
                label2.Text = "Device running...";
                start.Text = "Stop";
                timer1.Enabled = true;
            }
            else
            {
                label2.Text = "Error: No Device selected.";
            }
        }
        else
        {
            if (videoSource.IsRunning)
            {
                timer1.Enabled = false;
                CloseVideoSource();
                label2.Text = "Device stopped.";
                start.Text = "Start";
            }
        }
    }
}
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