转换的图像OpenCV的CV ::垫格式为C＃的BitmapImage [英] Converting an opencv image cv::Mat Format to a C# BitmapImage

问题描述

我写了这个示例code解释我的问题。我在VS 2013的解决方案，包含了一个C＃项目和一个C ++项目。我尝试阅读OpenCV的C ++中（86）的图像。并希望在传递给一个C＃项目86（使用CLR模式）为位图对象，然后BitmapImage的对象作为一个WPF的ImageSource使用。结果
我的C ++ code：

I wrote this sample code to explain my problem. I have a solution in VS 2013, contains one C# project and a C++ project. I try to read an image with OpenCV in C++ (x86). and want to pass in to a C# x86 project (used CLR mode) to a Bitmap Object and Then BitmapImage Object to use as a WPF ImageSource.
My C++ Code:

Bitmap^ SomeClass::Test(System::String^ imgFileName)
{
    auto fileName = msclr::interop::marshal_as<string>(imgFileName);
    Mat img = imread(fileName);
    //Do something
    auto bmp = gcnew Bitmap(img.cols, img.rows, img.step, Imaging::PixelFormat::Format24bppRgb, (IntPtr)img.data);
    bmp->Save("InC++Side.png");     
    return bmp;
}

我的C＃code：

My C# Code:

private void ImageTester(object sender, RoutedEventArgs e)
{
    var image = testClass.Test("test.png");
    image.Save("InC#Side.png");
    bg.Source = ConvertToBitmapImageFromBitmap(image);
}
public static BitmapImage ConvertToBitmapImageFromBitmap(Bitmap image)
{
    using(var ms = new MemoryStream())
    {
        image.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
        BitmapImage bImg = new BitmapImage();
        bImg.BeginInit();
        bImg.StreamSource = new MemoryStream(ms.ToArray());
        bImg.EndInit();
        return bImg;
    }
}

问题是用C ++（INC ++ Side.png）保存的文件是完美的;但另一种是presented C＃中的位图对象只是与图像的高度和宽度一个灰色的矩形。结果
问题出在哪里？结果
我怎么可以将图像传递给我的C＃项目？

Problem is that the file saved by C++ (InC++Side.png) is perfect; but the other one which is presented the Bitmap object in C# is just a gray rectangle with that image's Height and Width.
Where is the problem?
How I can pass the Image to my C# project?

推荐答案

看来这个问题是关于共享内存。结果
垫和位图是共享 C ++ 的内存。所以，当垫对象销毁时，位图对象无法访问数据。这就是为什么它的数据是在C ++侧正确的，但在C＃中端里面什么都没有。结果
为了解决这个问题，我用静电台垫。它永远不会释放，但能解决我的问题。

It seems that the problem is about the shared memory.
Mat and Bitmap are share the memory in C++. So, when the Mat object destroys, the Bitmap object can't access to the data. That's why its data is correct in C++ side but have nothing inside in C# side.
To solving this problem, I used static Mat. It'll never release, but can solve my problem.

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