WPF 没有用到 PictureBox, 而是用Image代替.
下面我试着加载显示一个图片 。
XAML
<Image x:Name="srcImg"Width="400"Height="300"></Image>CS Attempt 1:
Image<Bgr,Byte>My_Image=newImage<Bgr,byte>(Openfile.FileName);
srcImg.Source=My_Image.ToBitmap();Error Message
Cannot implicitly convert type 'System.Drawing.Bitmap'
to 'System.Windows.Media.ImageSource'CS Attempt 2:
Image<Bgr,Byte>My_Image=newImage<Bgr,byte>(Openfile.FileName);
srcImg.Source=newBitmapImage(My_Image);Error Message
Error1The best overloaded method match for'System.Windows.Media.Imaging.BitmapImage.BitmapImage(System.Uri)' has some invalid arguments
Error2Argument1: cannot convert from'Emgu.CV.Image<Emgu.CV.Structure.Bgr,byte>' to 'System.Uri'
解决方法：
Image<Bgr, Byte> My_Image = new Image<Bgr, byte>(Openfile.FileName);
srcImg.Source = BitmapSourceConvert.ToBitmapSource(myImage);
public static class BitmapSourceConvert
{
[DllImport("gdi32")]
private static extern int DeleteObject(IntPtr o); public static BitmapSource ToBitmapSource(IImage image)
{
using (System.Drawing.Bitmap source = image.Bitmap)
{
IntPtr ptr = source.GetHbitmap(); BitmapSource bs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
ptr,
IntPtr.Zero,
Int32Rect.Empty,
System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions()); DeleteObject(ptr);
return bs;
}
}
}
测试：
Bitmap bm = (Bitmap)Bitmap.FromFile(@"D:\my_testfiles\Main.png");
int count = ;
for (int i = ; i < count; i++)
{
Commons.BitMapToImageSource(bm.Clone() as Bitmap); }
结果：
当循环 1527次， 耗时 00:00:17.8860231后 报错。
ErrorTrace：
at System.Drawing.Bitmap.GetHbitmap(Color background)
at System.Drawing.Bitmap.GetHbitmap()
at SimpleClient.Commons.BitMapToImageSource(Bitmap bitmap) in D:\my_svn\universal-project\SimpleClient\Program.cs:line
ErrorMessage:
system.OutOfMemoryException: Out of memory.
改进： 写一个视频显示控件，内部实现显示Bitmap转换成BitmapSource。为控件Source开辟一块内存控件，然后一直刷新。首先我们使用EmuguCV里面的Capture。
控件继承Image、IDisposable接口并开放一个属性VideoSource。
代码如下：
public class CapPlayer : Image, IDisposable
{
private Capture videoSource;
public Capture VideoSource
{
set
{
if (value != null)
{
this.videoSource = value;
this.LaodCapPlayer();
}
}
} private InteropBitmap bitmapSource;
private IntPtr map;
private IntPtr section; public CapPlayer()
{
Application.Current.Exit += new ExitEventHandler(Current_Exit);
} private void LaodCapPlayer()
{
videoSource.ImageGrabbed += new Capture.GrabEventHandler(videoSource_ImageGrabbed);
videoSource.Start(); uint pcount = (uint)(videoSource.Width * videoSource.Height * PixelFormats.Bgr32.BitsPerPixel / );
section = CreateFileMapping(new IntPtr(-), IntPtr.Zero, 0x04, , pcount, null);
map = MapViewOfFile(section, 0xF001F, , , pcount);
bitmapSource = Imaging.CreateBitmapSourceFromMemorySection(section, (int)videoSource.Width, (int)videoSource.Height, PixelFormats.Bgr32,
(int)(videoSource.Width * PixelFormats.Bgr32.BitsPerPixel / ), ) as InteropBitmap;
this.Source = bitmapSource;
} void videoSource_ImageGrabbed(object sender, EventArgs e)
{
Capture camera = sender as Capture;
var frame = camera.RetrieveBgrFrame().Bitmap;
if (this.Dispatcher != null)
{
this.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Render, (SendOrPostCallback)delegate
{
if (map != IntPtr.Zero)
{
try
{
System.Drawing.Imaging.BitmapData bmpData = frame.LockBits(new System.Drawing.Rectangle(, , (int)videoSource.Width, (int)videoSource.Height),
System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppRgb);
/* Get the pointer to the pixels */
IntPtr pBmp = bmpData.Scan0;
int srcStride = bmpData.Stride;
int pSize = srcStride * (int)videoSource.Height;
CopyMemory(map, pBmp, pSize);
frame.UnlockBits(bmpData);
}
catch (Exception ex)
{
Microsoft.Practices.EnterpriseLibrary.Logging.Logger.Write(ex, "Info", );
} } if (bitmapSource != null)
{
bitmapSource.Invalidate();
}
}, null); } if (captureLock)
{
try
{
lock (mutCurrentImg)
{
camera.RetrieveBgrFrame().Save(imageFileName);
}
}
catch (System.Exception ex)
{
Microsoft.Practices.EnterpriseLibrary.Logging.Logger.Write(ex, "Info", );
}
captureLock = false;
}
} void Current_Exit(object sender, ExitEventArgs e)
{
this.Dispose();
}
object mutCurrentImg = new object();
bool captureLock = false;
string imageFileName = string.Empty;
public void ImaggingCapture(string imageFileName)
{
this.imageFileName = imageFileName;
this.captureLock = true;
} #region IDisposable Members public void Dispose()
{
if (videoSource != null)
videoSource.Stop();
Application.Current.Exit -= new ExitEventHandler(Current_Exit);
} #endregion [DllImport("Kernel32.dll", EntryPoint = "RtlMoveMemory")]
private static extern void CopyMemory(IntPtr Destination, IntPtr Source, int Length); [DllImport("kernel32.dll", SetLastError = true)]
static extern IntPtr CreateFileMapping(IntPtr hFile, IntPtr lpFileMappingAttributes, uint flProtect, uint dwMaximumSizeHigh, uint dwMaximumSizeLow, string lpName); [DllImport("kernel32.dll", SetLastError = true)]
static extern IntPtr MapViewOfFile(IntPtr hFileMappingObject, uint dwDesiredAccess, uint dwFileOffsetHigh, uint dwFileOffsetLow, uint dwNumberOfBytesToMap); }
测试结果：无异常，但是发现比较占用CPU 10%左右，内存 122M 左右，线程数32.
感觉不太理想CPU占用太多，我们把EmuguCV的Capture改为AForge.NEt的VideoCaptureDevice，代码如下：
public class CapPlayer : Image, IDisposable
{
private VideoCaptureDevice videoSource;
private InteropBitmap bitmapSource;
private IntPtr map;
private IntPtr section; public CapPlayer()
{ Application.Current.Exit += new ExitEventHandler(Current_Exit);
this.Loaded += new RoutedEventHandler(CapPlayer_Loaded);
videoSource = new VideoCaptureDevice(@"device:pnp:\\?\usb#vid_0ac8&pid_305b#5&ee85354&0&2#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"); } void CapPlayer_Loaded(object sender, RoutedEventArgs e)
{
videoSource.NewFrame += new NewFrameEventHandler(videoSource_NewFrame);
videoSource.Start(); uint pcount = (uint)(this.Width * this.Height * PixelFormats.Bgr32.BitsPerPixel / );
section = CreateFileMapping(new IntPtr(-), IntPtr.Zero, 0x04, , pcount, null);
map = MapViewOfFile(section, 0xF001F, , , pcount);
bitmapSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromMemorySection(section, (int)this.Width, (int)this.Height, PixelFormats.Bgr32,
(int)(this.Width * PixelFormats.Bgr32.BitsPerPixel / ), ) as InteropBitmap;
this.Source = bitmapSource;
} void Current_Exit(object sender, ExitEventArgs e)
{
this.Dispose();
}
object mutCurrentImg = new object();
bool captureLock = false;
string imageFileName = string.Empty;
public void ImaggingCapture(string imageFileName)
{
this.imageFileName = imageFileName;
this.captureLock = true;
} private void videoSource_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
//eventArgs.Frame.Save(stream, System.Drawing.Imaging.ImageFormat.Bmp); if (this.Dispatcher != null)
{
this.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Render, (SendOrPostCallback)delegate
{
if (map != IntPtr.Zero)
{
System.Drawing.Imaging.BitmapData bmpData = eventArgs.Frame.LockBits(new System.Drawing.Rectangle(, , (int)this.Width, (int)this.Height),
System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppRgb);
/* Get the pointer to the pixels */
IntPtr pBmp = bmpData.Scan0;
int srcStride = bmpData.Stride;
int pSize = srcStride * (int)this.Height;
CopyMemory(map, pBmp, pSize);
eventArgs.Frame.UnlockBits(bmpData);
} if (bitmapSource != null)
{
bitmapSource.Invalidate();
}
}, null); } if (captureLock)
{
try
{
lock (mutCurrentImg)
{
eventArgs.Frame.Save(imageFileName);
}
}
catch (System.Exception ex)
{
}
captureLock = false;
}
} #region IDisposable Members public void Dispose()
{
if (videoSource != null)
videoSource.SignalToStop();
} #endregion [DllImport("Kernel32.dll", EntryPoint = "RtlMoveMemory")]
private static extern void CopyMemory(IntPtr Destination, IntPtr Source, int Length); [DllImport("kernel32.dll", SetLastError = true)]
static extern IntPtr CreateFileMapping(IntPtr hFile, IntPtr lpFileMappingAttributes, uint flProtect, uint dwMaximumSizeHigh, uint dwMaximumSizeLow, string lpName); [DllImport("kernel32.dll", SetLastError = true)]
static extern IntPtr MapViewOfFile(IntPtr hFileMappingObject, uint dwDesiredAccess, uint dwFileOffsetHigh, uint dwFileOffsetLow, uint dwNumberOfBytesToMap); }
测试结果：无异常，但是发现占用CPU 1%左右，内存 72M 左右，线程数28. 是不是比较理想呢！！
|
CPU |
内存 |
线程数 |
|
|
EmuguCV |
10%左右 |
122M左右 |
32 |
|
Aforge.Net |
1%左右 |
72M左右 |
28 |
我的电脑配置.
摄像头：FrameRate 30，Width 320 Height 240.
电脑型号 戴尔 Precision WorkStation T3400 Tower
操作系统 Windows 7 旗舰版 32位 SP1 ( DirectX 11 )
处理器 英特尔 酷睿2 双核 E8400 @ 3.00GHz
主板 戴尔 0HY553 (英特尔 X38/X48 Express 芯片组 - ICH9R)
内存 4 GB ( 海力士 DDR2 800MHz / 金士顿 DDR2 667MHz )
主硬盘 西数 WDC WD3200AAKS-75L9A0 ( 320 GB / 7200 转/分 )
显卡 Nvidia Quadro NVS 290 ( 256 MB / Nvidia )
显示器 戴尔 DELA04A DELL E170S ( 17.1 英寸 )
光驱 飞利浦-建兴 DVD-ROM DH-16D5S DVD光驱
声卡 Analog Devices AD1984 @ 英特尔 82801I(ICH9) 高保真音频
网卡 博通 BCM5754 NetXtreme Gigabit Ethernet / 戴尔
gdi32.dll
系统文件gdi32.dll是存放在Windows系统文件夹中的重要文件，通常情况下是在安装操作系统过程中自动创建的，对于系统正常运行来说至关重要。除非用户电脑被木马病毒、或是流氓软件篡改导致出现gdi32.dll丢失、缺失损坏等弹窗现象，否则不建议用户对该类文件（gdi32.dll）进行随意的修改。
gdi32.dll是Windows GDI图形用户界面相关程序，包含的函数用来绘制图像和显示文字。