C# WPF 顯示圖片和視頻顯示 EmuguCv、AForge.Net測試

WPF 沒有用到 PictureBox, 而是用Image代替.

下面我試着加載顯示一個圖片 。

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'

解決方法：

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;
        }
    }
}

 

 測試：

 Bitmap bm = (Bitmap)Bitmap.FromFile(@"D:\my_testfiles\Main.png");
            int count = 10000000;
            for (int i = 0; i < count; i++)
            {
                Commons.BitMapToImageSource(bm.Clone() as Bitmap);

            }

結果：

當循環 1527次，  耗時 00:00:17.8860231后  報錯。

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 165

ErrorMessage:

system.OutOfMemoryException: Out of memory.

改進：

寫一個視頻顯示控件，內部實現顯示Bitmap轉換成BitmapSource。為控件Source開辟一塊內存控件，然后一直刷新。首先我們使用EmuguCV里面的Capture。
控件繼承Image、IDisposable接口並開放一個屬性VideoSource。

代碼如下：

    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 / 8);
            section = CreateFileMapping(new IntPtr(-1), IntPtr.Zero, 0x04, 0, pcount, null);
            map = MapViewOfFile(section, 0xF001F, 0, 0, pcount);
            bitmapSource = Imaging.CreateBitmapSourceFromMemorySection(section, (int)videoSource.Width, (int)videoSource.Height, PixelFormats.Bgr32,
                (int)(videoSource.Width * PixelFormats.Bgr32.BitsPerPixel / 8), 0) 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(0, 0, (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", 0);
                        }

                    }

                    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", 0);
                }
                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);

    }

測試結果：無異常，但是發現比較占用CPU 10%左右，內存 122M 左右，線程數32.

感覺不太理想CPU占用太多，我們把EmuguCV的Capture改為AForge.NEt的VideoCaptureDevice，代碼如下：

    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 / 8);
            section = CreateFileMapping(new IntPtr(-1), IntPtr.Zero, 0x04, 0, pcount, null);
            map = MapViewOfFile(section, 0xF001F, 0, 0, pcount);
            bitmapSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromMemorySection(section, (int)this.Width, (int)this.Height, PixelFormats.Bgr32,
                (int)(this.Width * PixelFormats.Bgr32.BitsPerPixel / 8), 0) 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(0, 0, (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);

    }

 

測試結果：無異常，但是發現占用CPU 1%左右，內存 72M 左右，線程數28. 是不是比較理想呢！！

	CPU	內存	線程數
EmuguCV	10%左右	122M左右	32
Aforge.Net	1%左右	72M左右	28

我的電腦配置.

攝像頭：FrameRate 30，Width 320 Height 240.

電腦型號 戴爾 Precision WorkStation T3400 Tower
操作系統 Windows 7 旗艦版 32位 SP1 ( DirectX 11 )
處理器 英特爾 酷睿2 雙核 E8400 @ 3.00GHz
主板 戴爾 0HY553 (英特爾 X38/X48 Express 芯片組 - ICH9R)
內存 4 GB ( 海力士 DDR2 800MHz / 金士頓 DDR2 667MHz )
主硬盤 西數 WDC WD3200AAKS-75L9A0 ( 320 GB / 7200 轉/分 )
顯卡 Nvidia Quadro NVS 290 ( 256 MB / Nvidia )
顯示器 戴爾 DELA04A DELL E170S ( 17.1 英寸 )
光驅 飛利浦-建興 DVD-ROM DH-16D5S DVD光驅
聲卡 Analog Devices AD1984 @ 英特爾 82801I(ICH9) 高保真音頻
網卡 博通 BCM5754 NetXtreme Gigabit Ethernet / 戴爾

gdi32.dll

系統文件gdi32.dll是存放在Windows系統文件夾中的重要文件，通常情況下是在安裝操作系統過程中自動創建的，對於系統正常運行來說至關重要。除非用戶電腦被木馬病毒、或是流氓軟件篡改導致出現gdi32.dll丟失、缺失損壞等彈窗現象，否則不建議用戶對該類文件（gdi32.dll）進行隨意的修改。

gdi32.dll是Windows GDI圖形用戶界面相關程序，包含的函數用來繪制圖像和顯示文字。