如何从另一个 class 获取变量的值

Question

我正在使用 Emgu CV 的 SURF，我使用 int j = CvInvoke.cvCountNonZero(mask); 来查找匹配的对点。问题如何把return这个值变成main()?

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public static Image<Bgr, Byte> Draw(Image<Gray, Byte> modelImage, Image<Gray, byte> observedImage, out long matchTime)      
{
    HomographyMatrix homography;
    VectorOfKeyPoint modelKeyPoints;
    VectorOfKeyPoint observedKeyPoints;
    Matrix<int> indices;
    Matrix<byte> mask;

    FindMatch(modelImage, observedImage, out matchTime, out modelKeyPoints, out observedKeyPoints, out indices, out mask, out homography);

    //Draw the matched keypoints
    Image<Bgr, Byte> result = Features2DToolbox.DrawMatches(modelImage, modelKeyPoints, observedImage, observedKeyPoints, indices, new Bgr(255, 255, 255), new Bgr(255, 255, 255), mask, Features2DToolbox.KeypointDrawType.DEFAULT);

    int j = CvInvoke.cvCountNonZero(mask);
    return result;
}

Answer 1

您可以创建一个简单的结果对象：

public class DrawingResult {
    public Image<Bgr, Byte> Images { get; private set; }
    public int Count {get; private set; }

    public DrawingResult(Image<Bgr, Byte> images, int count) {
       Images = images;
       Count = count;
    }
}

在你的方法中：

public static DrawingResult Draw(Image<Gray, Byte> modelImage, Image<Gray, byte> observedImage, out long matchTime)
{
    HomographyMatrix homography;
    VectorOfKeyPoint modelKeyPoints;
    VectorOfKeyPoint observedKeyPoints;
    Matrix<int> indices;
    Matrix<byte> mask;

    FindMatch(modelImage, observedImage, out matchTime, out modelKeyPoints, out observedKeyPoints, out indices, out mask, out homography);

    //Draw the matched keypoints
    Image<Bgr, Byte> result = Features2DToolbox.DrawMatches(modelImage, modelKeyPoints, observedImage, observedKeyPoints,
       indices, new Bgr(255, 255, 255), new Bgr(255, 255, 255), mask, Features2DToolbox.KeypointDrawType.DEFAULT);

    int j = CvInvoke.cvCountNonZero(mask);
    return new DrawingResult(result, j);
}

并且在 main 方法中：

DrawingResult result = MyClass.Draw(...);
int count = result.Count;
Image<Bgr, Byte> images = result.Images;

如何从另一个 class 获取变量的值

How to get value of a variable from another class

c#

class

surf