Question

如何获得人脸图像中眼睛的位置？例如，我的程序搜索眼睛，然后将它们的位置存储在2D向量中，例如：

Vector2 leftEye = new Vector2(56, 50);

我听说过Emgu，但是我真的不明白它如何与XML一起使用...

Answer 1

这里是使用Emgu 3.4.1的示例。训练数据xml在GitHub上可用，您将其加载到CascadeClassifier类中，然后可以执行检测。

using Emgu.CV;
using Emgu.CV.Structure;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Net;

public class Program
{
    private const string EYE_DETECTION_XML = "https://raw.githubusercontent.com/opencv/opencv/master/data/haarcascades/haarcascade_eye.xml";
    private const string SAMPLE_IMAGE = "https://upload.wikimedia.org/wikipedia/commons/thumb/1/18/Lewis_Hamilton_2016_Malaysia_2.jpg/330px-Lewis_Hamilton_2016_Malaysia_2.jpg";

    static void Main()
    {
        // download sample photo
        WebClient client = new WebClient();
        Bitmap image = null;
        using (MemoryStream ms = new MemoryStream(client.DownloadData(SAMPLE_IMAGE)))
            image = new Bitmap(Image.FromStream(ms));

        // convert to Emgu image, convert to grayscale and increase brightness/contrast
        Emgu.CV.Image<Bgr, byte> emguImage = new Emgu.CV.Image<Bgr, byte>(image);
        var grayScaleImage = emguImage.Convert<Gray, byte>();
        grayScaleImage._EqualizeHist();

        // load eye classifier data
        string eye_classifier_local_xml = @"c:\temp\haarcascade_eye.xml";
        client.DownloadFile(@EYE_DETECTION_XML, eye_classifier_local_xml);        
        CascadeClassifier eyeClassifier = new CascadeClassifier(eye_classifier_local_xml);

        // perform detection which will return rectangles of eye positions
        var eyes = eyeClassifier.DetectMultiScale(grayScaleImage, 1.1, 4);

        // draw those rectangles on original image
        foreach (Rectangle eye in eyes)
            emguImage.Draw(eye, new Bgr(255, 0, 0), 3);

        // save image and show it
        string output_image_location = @"c:\temp\output.png";        
        emguImage.ToBitmap().Save(output_image_location, ImageFormat.Png);
        Process.Start(output_image_location);    
    }
}

人脸图像中的眼睛位置？

1 个答案: