如何显示用Emgu拍摄的摄像头图像？
问题描述：
我目前正在使用面部识别项目。 因此，我需要一种方法来向用户显示摄像头图像，以便他可以调整他的脸部。如何显示用Emgu拍摄的摄像头图像？
但没有的：
我已经尝试了很多东西作为使用更少的CPU尽可能摆脱摄像头的图像他们很好......无论哪种方式太慢或太耗费CPU资源。
然后我尝试了Emgu library，我感觉很棒。 起初，我在一个Windows Form项目中尝试了它，并更新了图片框中的图像。 但后来，当我试图眼下将其集成在我的WPF项目我就死在如何我的形象传递给我的图像控制..
，我有以下代码：
<Window x:Class="HA.FacialRecognition.Enroll.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Width="800" Height="600"
Loaded="Window_Loaded" Closing="Window_Closing">
<Grid>
<Image x:Name="webcam" Width="640" Height="480" >
<Image.Clip>
<EllipseGeometry RadiusX="240" RadiusY="240">
<EllipseGeometry.Center>
<Point X="320" Y="240" />
</EllipseGeometry.Center>
</EllipseGeometry>
</Image.Clip>
</Image>
</Grid>
</Window>
而后面的代码：
private Capture capture;
private System.Timers.Timer timer;
public Window1()
{
InitializeComponent();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
capture = new Capture();
capture.FlipHorizontal = true;
timer = new System.Timers.Timer();
timer.Interval = 15;
timer.Elapsed += new ElapsedEventHandler(timer_Elapsed);
timer.Start();
}
void timer_Elapsed(object sender, ElapsedEventArgs e)
{
using (Image<Bgr, byte> frame = capture.QueryFrame())
{
if (frame != null)
{
var bmp = frame.Bitmap;
// How do I pass this bitmap to my Image control called "webcam"?
}
}
}
private void Window_Closing(object sender, CancelEventArgs e)
{
if (capture != null)
{
capture.Dispose();
}
}
我的猜测是使用的BitmapSource/WriteableBitmap的，但我没有让他们的工作...
谢谢！
答
图像类已经得到了，你可能会寻找
答
一个UriSource属性我相信你有互操作使用（source）：哪位能像这样被使用
using System.Windows.Interop;
using System.Windows.Media.Imaging;
public static ImageSource AsImageSource<TColor, TDepth>(
this Image<TColor, TDepth> image) where TColor : IColor, new()
{
return Imaging.CreateBitmapSourceFromHBitmap(image.Bitmap.GetHbitmap(),
IntPtr.Zero, Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());
}
：
void timer_Elapsed(object sender, ElapsedEventArgs e)
{
using (Image<Bgr, byte> frame = capture.QueryFrame())
{
if (frame != null)
{
var bmp = frame.AsImageSource();
}
}
}
如果互操作性能不够好，请查看Image.ToBitmap和Image.get_Bitmap的来源，以了解如何实现自己的WriteableBitmap。
答
查看Emgu wiki - >教程 - >示例 - > WPF（Windows Presentation Foundation） 它包含以下代码片段，可将您的IImage转换为可直接应用于您的控件的BitmapSource。
使用Emgu.CV; using System.Runtime.InteropServices; ...
/// <summary>
/// Delete a GDI object
/// </summary>
/// <param name="o">The poniter to the GDI object to be deleted</param>
/// <returns></returns>
[DllImport("gdi32")]
private static extern int DeleteObject(IntPtr o);
/// <summary>
/// Convert an IImage to a WPF BitmapSource. The result can be used in the Set Property of Image.Source
/// </summary>
/// <param name="image">The Emgu CV Image</param>
/// <returns>The equivalent BitmapSource</returns>
public static BitmapSource ToBitmapSource(IImage image)
{
using (System.Drawing.Bitmap source = image.Bitmap)
{
IntPtr ptr = source.GetHbitmap(); //obtain the Hbitmap
BitmapSource bs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
ptr,
IntPtr.Zero,
Int32Rect.Empty,
System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());
DeleteObject(ptr); //release the HBitmap
return bs;
}
}
答
我想你正在寻找一切是这样的：
Image<Bgr, Byte> frame = capture.QueryFrame();
pictureBox1.Image = image.ToBitmap(pictureBox1.Width, pictureBox1.Height);
答
如果您正在使用WPF和MVVM这里是你将如何使用EMGU做到这一点。
查看：
<Window x:Class="HA.FacialRecognition.Enroll.Views.PhotoCaptureView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Width="800" Height="600">
<Grid>
<Image Width="640" Height="480" Source="{Binding CurrentFrame}">
<Image.Clip>
<EllipseGeometry RadiusX="240" RadiusY="240">
<EllipseGeometry.Center>
<Point X="320" Y="240" />
</EllipseGeometry.Center>
</EllipseGeometry>
</Image.Clip>
</Image>
</Grid>
视图模型：
namespace HA.FacialRecognition.Enroll.ViewModels
{
public class PhotoCaptureViewModel : INotifyPropertyChanged
{
public PhotoCaptureViewModel()
{
StartVideo();
}
private DispatcherTimer Timer { get; set; }
private Capture Capture { get; set; }
private BitmapSource _currentFrame;
public BitmapSource CurrentFrame
{
get { return _currentFrame; }
set
{
if (_currentFrame != value)
{
_currentFrame = value;
OnPropertyChanged();
}
}
}
private void StartVideo()
{
Capture = new Capture();
Timer = new DispatcherTimer();
//framerate of 10fps
Timer.Interval = TimeSpan.FromMilliseconds(100);
Timer.Tick += new EventHandler(async (object s, EventArgs a) =>
{
//draw the image obtained from camera
using (Image<Bgr, byte> frame = Capture.QueryFrame())
{
if (frame != null)
{
CurrentFrame = ToBitmapSource(frame);
}
}
});
Timer.Start();
}
public static BitmapSource ToBitmapSource(IImage image)
{
using (System.Drawing.Bitmap source = image.Bitmap)
{
IntPtr ptr = source.GetHbitmap(); //obtain the Hbitmap
BitmapSource bs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(ptr, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
DeleteObject(ptr); //release the HBitmap
return bs;
}
}
/// <summary>
/// Delete a GDI object
/// </summary>
[DllImport("gdi32")]
private static extern int DeleteObject(IntPtr o);
//implementation of INotifyPropertyChanged, viewmodel disposal etc
}
啊，但是我需要什么做的，使我的 “网络摄像头” 图像控制显示图像？我尝试过： webcam.Source = frame.AsImageSource（）; 但它不显示任何东西... – ZogStriP 2009-04-22 13:13:08