【EMGU】EMGU中人脸检测的例子

Emgu：可以理解为opencv的另外一种形式的库，它可以兼容.NET的C#、C++、VB、python，也能支持跨平台，Windows, Linux, Mac OS X, iOS, Android 和 Windows Phone等等。

以下是C#中Emgu的简单实例，检测图像或者视频中是否有人脸。

如果有，会在图片框中显示人脸部分。

using System;
using System.Windows.Forms;
using System.Drawing;
using Emgu.CV;
using Emgu.Util;
using Emgu.CV.Structure;
using Emgu.CV.CvEnum;

namespace opencvtut
{
public partial class Form1 : Form
{
private Capture cap;
private HaarCascade haar;

public Form1()
{
InitializeComponent();
}

private void timer1_Tick(object sender, EventArgs e)
{
using (Image<Bgr, byte> nextFrame = cap.QueryFrame())
{
if (nextFrame != null)
{
// there's only one channel (greyscale), hence the zero index
//var faces = nextFrame.DetectHaarCascade(haar)[0];
Image<Gray, byte> grayframe = nextFrame.Convert<Gray, byte>();
var faces =
grayframe.DetectHaarCascade(
haar, 1.4, 4,
HAAR_DETECTION_TYPE.DO_CANNY_PRUNING,
new Size(nextFrame.Width/8, nextFrame.Height/8)
)[0];

foreach (var face in faces)
{
nextFrame.Draw(face.rect, new Bgr(0,double.MaxValue,0), 3);
}
pictureBox1.Image = nextFrame.ToBitmap();
}
}
}

private void Form1_Load(object sender, EventArgs e)
{
// passing 0 gets zeroth webcam
cap = new Capture(0);
// adjust path to find your xml
haar = new HaarCascade(
"..\\..\\..\\..\\lib\\haarcascade_frontalface_alt2.xml");
}
}
}