如何在 OpenCV 中使用 Mat::type() 找出 Mat 对象的类型 [英] How to find out what type of a Mat object is with Mat::type() in OpenCV

问题描述

我对 OpenCV 中 Mat 对象的 type() 方法有点困惑.
如果我有以下几行:

I am kind of confused with type() method of Mat object in OpenCV.
If I have following lines:

mat = imread("C:someimage.jpg");
type = mat.type();

和 type = 16.我如何找出垫矩阵的类型?.
我试图在其手册或几本书中找到答案，但徒劳无功.

and type = 16. How do I find out what type of mat matrix is?.
I tried to find the answer in its manual or in a couple of books in vain.

推荐答案

这是一个方便的函数，您可以使用它来帮助在运行时识别您的 opencv 矩阵.我发现它至少对调试很有用.

Here is a handy function you can use to help with identifying your opencv matrices at runtime. I find it useful for debugging, at least.

string type2str(int type) {
  string r;

  uchar depth = type & CV_MAT_DEPTH_MASK;
  uchar chans = 1 + (type >> CV_CN_SHIFT);

  switch ( depth ) {
    case CV_8U:  r = "8U"; break;
    case CV_8S:  r = "8S"; break;
    case CV_16U: r = "16U"; break;
    case CV_16S: r = "16S"; break;
    case CV_32S: r = "32S"; break;
    case CV_32F: r = "32F"; break;
    case CV_64F: r = "64F"; break;
    default:     r = "User"; break;
  }

  r += "C";
  r += (chans+'0');

  return r;
}

如果 M 是 Mat 类型的 var 你可以这样调用它:

If M is a var of type Mat you can call it like so:

string ty =  type2str( M.type() );
printf("Matrix: %s %dx%d 
", ty.c_str(), M.cols, M.rows );

会输出数据如:

Matrix: 8UC3 640x480 
Matrix: 64FC1 3x2 

值得注意的是，还有矩阵方法Mat::depth()和Mat::channels().这个函数只是一种方便的方式，可以从这两个值的组合中获得人类可读的解释，这两个值的位都存储在同一个值中.

Its worth noting that there are also Matrix methods Mat::depth() and Mat::channels(). This function is just a handy way of getting a human readable interpretation from the combination of those two values whose bits are all stored in the same value.

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