如何从像素字节数组创建BitmapImage（实时视频显示）

Question

如何从像素字节数组创建BitmapImage（实时视频显示）

7

我需要在一个WPF控件上显示实时图像。我正在寻找使用WPF最快的方法来实现这一点。

我正在使用摄像头的dll API（AVT）捕获图像。

图像由dll编写，相机通过指向名为tFrame的Image结构的IntPtr引发回调（如下所述）。像素数据存储在ImageBuffer属性中，该属性是指向字节数组的InPtr。

我知道如何从像素字节数组创建位图，但不知道如何创建BitmapImage。所以可以创建位图，然后从中创建BitmapImage。这里有一种从内存中的位图创建BitmapImage的方法。但我想直接从数据源（tFrame）创建BitmapImage。我该怎么做？

我知道BitmapImage具有CopyPixels方法，但缺少SetPixels。

public struct tFrame
{
    public IntPtr AncillaryBuffer;
    public uint AncillaryBufferSize;
    public uint AncillarySize;
    public tBayerPattern BayerPattern;
    public uint BitDepth;
    public tFrameCtx Context;
    public tImageFormat Format;
    public uint FrameCount;
    public uint Height;
    public IntPtr ImageBuffer;
    public uint ImageBufferSize;
    public uint ImageSize;
    public uint RegionX;
    public uint RegionY;
    public tErr Status;
    public uint TimestampHi;
    public uint TimestampLo;
    public uint Width;
}

这里是我从像素字节数组创建位图的方法。这个方法用于软件的WinForm版本。

private void CreateBitmap(tFrame frame)
{
    //This sample is for a 8bpp captured image
    PixelFormat pxFormat = PixelFormat.Format8bppIndexed;

    //STRIDE
    //[https://dev59.com/SUvSa4cB1Zd3GeqPbRG6#1983886][3]
    //float bitsPerPixel = System.Drawing.Image.GetPixelFormatSize(format);
    int bitsPerPixel = ((int)pxFormat >> 8) & 0xFF;
    //Number of bits used to store the image data per line (only the valid data)
    int validBitsPerLine = ((int)frame.Width) * bitsPerPixel;
    //4 bytes for every int32 (32 bits)
    int stride = ((validBitsPerLine + 31) / 32) * 4;

    Bitmap bmp = new Bitmap((int)frame.Width, (int)frame.Height, stride, pxFormat, frame.ImageBuffer);
}

编辑1:

感谢dr.mo，现在我能够显示60FPS 1024x1024的图像，并且CPU使用率仅为~3％！我的做法是：

//@ UI Thread
public WriteableBitmap wbm = new WriteableBitmap(1024, 1024, (double)96, (double)96, System.Windows.Media.PixelFormats.Gray8, null);
this.wbBackBuffer = this.wbm.BackBuffer;

//This can be called by a timer in the UI thread or at the grab Thread for every image, the CPU usage is almost the same.
void UpdateDisplayImage()
{
wbm.Lock();
wbm.AddDirtyRect(new Int32Rect(0, 0, wbm.PixelWidth, wbm.PixelHeight));
wbm.Unlock();
}

//@ Grab Thread
//Update the backbuffer with new camera image data.
UpdateBackBuffer(...);

/// <summary>
/// [http://msdn.microsoft.com/en-us/library/system.windows.media.imaging.writeablebitmap.aspx]
/// </summary>
public void UpdateBackBuffer(IntPtr pData, int w, int h, int ch)
{
    //Can not acess wbm from outside UI thread
    //CopyMemory(wbm.BackBuffer, pData, (uint)(w * h * ch));
    //I dont know if it is safe to write to it buffer like this:
    CopyMemory(this.wbBackBuffer, pData, (uint)(w * h * ch));
}

- Pedro77

msdn.microsoft.com/en-gb/library/system.windows.interop.imaging.createbitmapsourcefrommemorysection.aspx - DarkSquirrel42

请查看此链接：https://dev59.com/BW_Xa4cB1Zd3GeqP0Fkg#15290190 - Obama

@ DarkSquirrel42。抱歉，该链接已损坏。 - Pedro77

1个回答

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- morishuz · Accepted Answer

这应该能解决问题。它非常快速。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

using System.Drawing;
using System.Runtime.InteropServices;
using System.IO;
using System.ComponentModel;


public class MakeBitmapSource
{
    [DllImport("kernel32.dll", EntryPoint = "RtlMoveMemory")]
    public static extern void CopyMemory(IntPtr Destination, IntPtr Source, uint Length);



    public static BitmapSource FromNativePointer(IntPtr pData, int w, int h, int ch)
    {
        PixelFormat format = PixelFormats.Default;

        if (ch == 1) format = PixelFormats.Gray8; //grey scale image 0-255
        if (ch == 3) format = PixelFormats.Bgr24; //RGB
        if (ch == 4) format = PixelFormats.Bgr32; //RGB + alpha


        WriteableBitmap wbm = new WriteableBitmap(w, h, 96, 96, format, null);
        CopyMemory(wbm.BackBuffer, pData, (uint)(w * h * ch));

        wbm.Lock();
        wbm.AddDirtyRect(new Int32Rect(0, 0, wbm.PixelWidth, wbm.PixelHeight));
        wbm.Unlock();

        return wbm;
    }

    public static BitmapSource FromArray(byte[] data, int w, int h, int ch)
    {
        PixelFormat format = PixelFormats.Default;

        if (ch == 1) format = PixelFormats.Gray8; //grey scale image 0-255
        if (ch == 3) format = PixelFormats.Bgr24; //RGB
        if (ch == 4) format = PixelFormats.Bgr32; //RGB + alpha


        WriteableBitmap wbm = new WriteableBitmap(w, h, 96, 96, format, null);
        wbm.WritePixels(new Int32Rect(0, 0, w, h), data, ch * w, 0);

        return wbm;
    }
}