如何转换cv :: Mat至CvArr？

Question

我已经花了很多时间搜索如何从cv :: Mat或CvMat转换为CvArr，但没有任何收获，请帮助我，谢谢。

Answer 1

Mat img = imread("C:\MyPic.jpg",CV_LOAD_IMAGE_GRAYSCALE);
IplImage tmp=img;
cvErode(&tmp, &tmp, 0, 2);
Mat laser=&tmp;
    imshow("Eroded",laser);

I converted cv::Mat to CvArr by this way. Instead of using tmp directly use &tmp .

Answer 2

When I need to do that I just use :

IplImage tmp = image;

With image a Mat variable.

Answer 3

如果我没记错的话，CvMat是一个CvArr所以你可以把它转换成CvArr，现在CvArr的第一个字节告诉函数它实际上是一个CvMat： http ：//opencv.willowgarage.com/documentation/basic_structures 的.html＃cvarr

Answer 4

Are you sure you want to convert it? sometimes there is equivalent function that use what you have. For example cvMorphologyEx is using CvArr but morphologyEx is using cv::Mat .

Answer 5

convert first the image using the following:

IplImage* oldstyleimg = &matimg.operator IplImage()

I don t remember if it only create the header for the image or it makes a copy