EMGU with C# WPF

本文关键字：WPF with EMGU | 更新日期: 2023-09-27 18:13:53

我正在尝试遵循以下教程，但使用WPF而不是Win Forms:

A Basic Program

WPF不使用PictureBox，而是使用Image。

所以这里尝试加载一个Image。

XAML 

<Image x:Name="srcImg" Width="400" Height="300"></Image>

CS尝试1:

Image<Bgr, Byte> My_Image = new Image<Bgr, byte>(Openfile.FileName);
srcImg.Source = My_Image.ToBitmap();
错误消息

Cannot implicitly convert type 'System.Drawing.Bitmap' 
to 'System.Windows.Media.ImageSource'

CS尝试2:

Image<Bgr, Byte> My_Image = new Image<Bgr, byte>(Openfile.FileName);
srcImg.Source = new BitmapImage(My_Image);
错误消息

Error   1   The best overloaded method match for 'System.Windows.Media.Imaging.BitmapImage.BitmapImage(System.Uri)' has some invalid arguments  
Error   2   Argument 1: cannot convert from 'Emgu.CV.Image<Emgu.CV.Structure.Bgr,byte>' to 'System.Uri'

你知道我做错了什么吗?

EMGU with C# WPF

问题解决。转换图像:

Image<Bgr, Byte> My_Image = new Image<Bgr, byte>(Openfile.FileName);
srcImg.Source = BitmapSourceConvert.ToBitmapSource(myImage);

BitmapSourceConvert类:

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;
        }
    }
}

对于EmguCV的v4.4版本，一旦您添加了Emgu.CV.Bitmap nuget包，您可以转换Image<TColor,>使用image.ToBitmap()函数在。net standard中转换System.Drawing.Bitmap。

请注意，对于非windows平台，System.Drawing.Bitmap需要安装本地gdi+才能工作。

您可以从Bitmap(浪费，但您已经有ToBitmap())中获得ImageSource，或者您可以实现直接转换。

如果你想使用Emgu CV与WPF，你应该考虑做一个用户控件与Emgu的图片框(这个控件只适用于win窗体)，然后使用它与WindowsFormsHost。

从%installfolder%/Emgu/emgucv-windesktop x.x.x/Emgu.CV.WPF复制BitmapSourceConverter.cs并添加到您的项目中以转换为BitmapSource。这是完整的版本:

//----------------------------------------------------------------------------
//  Copyright (C) 2004-2017 by EMGU Corporation. All rights reserved.
//----------------------------------------------------------------------------
using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using Emgu.CV;
using Emgu.CV.CvEnum;
namespace Emgu.CV.WPF
{
   public static class BitmapSourceConvert
   {
      /// <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;
         }
      }
      public static Mat ToMat(BitmapSource source)
      {
         if (source.Format == PixelFormats.Bgra32)
         {
            Mat result = new Mat();
            result.Create(source.PixelHeight, source.PixelWidth, DepthType.Cv8U, 4);
            source.CopyPixels(Int32Rect.Empty, result.DataPointer, result.Step*result.Rows, result.Step);
            return result;
         } else if (source.Format == PixelFormats.Bgr24)
         {
            Mat result = new Mat();
            result.Create(source.PixelHeight, source.PixelWidth, DepthType.Cv8U, 3);
            source.CopyPixels(Int32Rect.Empty, result.DataPointer, result.Step * result.Rows, result.Step);
            return result;
         }
         else
         {
            throw new Exception(String.Format("Convertion from BitmapSource of format {0} is not supported.", source.Format));
         }
      }
   }
}
相关文章：