我目前正在开发一个使用面部识别的项目。 因此，我需要一种方法向用户显示网络摄像头图像，以便他可以调整他的脸部。
我一直在尝试使用尽可能少的CPU从网络摄像头获取图像：
但是没有一个是好的......无论是太慢还是太耗费CPU资源。
然后我尝试了Emgu library，我觉得很棒。 首先，我在Windows窗体项目中尝试了它，并在图片框中更新图像。 但是，当我试图将它集成到我的WPF项目中时，我遇到了如何将我的图像传递给我的Image控件的问题。
现在，我有以下源代码：
<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>
背后的代码：
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BitmapSource / WriteableBitmap，但我没有让它们正常工作......
谢谢！
答案 0 :(得分：3)
Image Class有一个你可能正在寻找的UriSource属性
答案 1 :(得分：3)
看看Emgu wiki - ＆gt;教程 - ＆gt;示例 - ＆gt; WPF（Windows Presentation Foundation） 它包含以下代码片段，用于将IImage转换为BitmapSource，您可以直接将其应用于您的控件。
使用Emgu.CV; 使用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;
}
}
答案 2 :(得分：3)
我认为你要找的就是：
Image<Bgr, Byte> frame = capture.QueryFrame();
pictureBox1.Image = image.ToBitmap(pictureBox1.Width, pictureBox1.Height);
答案 3 :(得分：3)
如果您正在使用WPF和MVVM，请使用EMGU进行操作。
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
}
答案 4 :(得分：0)
我相信你必须使用互操作（source）：
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());
}
可以这样使用：
void timer_Elapsed(object sender, ElapsedEventArgs e)
{
using (Image<Bgr, byte> frame = capture.QueryFrame())
{
if (frame != null)
{
var bmp = frame.AsImageSource();
}
}
}
如果互操作效果不佳，请查看Image.ToBitmap和Image.get_Bitmap的来源，了解如何实施自己的WriteableBitmap。
答案 5 :(得分：0)
答案 6 :(得分：0)