我试图理解如何进行这种转换，但我仍然有相同的错误。我需要在java中把一个ipl图像转换成mat来获得图像的细节。这里的错误：类型不匹配：无法从opencv\u core.iplimage转换为mat

public class Image {
    IplImage i;
    public void downsample(){
        System.loadLibrary( Core.NATIVE_LIBRARY_NAME );             
        Mat Out= new Mat();
        Mat in(i); //  error in this line
        //Down sample the image by factor of 2
        Imgproc.pyrDown(in, Out);
    }
}