从数组创建Mat时类型'cv :: Mat'和'int'不兼容

Question

In the documentation on Mat it shows how to create a Mat with a comma-separated initializer as follows:

// create 3x3 double-precision identity matrix
Mat M = (Mat_<double>(3,3) << 1, 0, 0, 0, 1, 0, 0, 0, 1);

But when I try, it shows an error:

Types 'cv::Mat' and 'int' are not compatible

how to fix the exception?

thank you

Answer 1

There is no issue with your code

cv::Mat M = (cv::Mat_<double>(3,3) << 1, 0, 0, 0, 1, 0, 0, 0, 1);

I can confirm that it works with gcc 5.4.0 and OpenCV 3.1.0. Small matrices of fixed size should be created with Matx:

typedef cv::Matx<double, 3, 3> Mat33d;
Mat33d m(1, 0, 0, 0, 1, 0, 0, 0, 1);