轉載： http://www.cnblogs.com/phillips/p/4484717.html?utm_source=tuicool&utm_medium=referral

Mat_<uchar>---------CV_8U

Mat<char>-----------CV_8S

Nat_<short>---------CV_16S

Mat_<ushort>--------CV_16U

Mat_<int>-----------CV_32S

Mat_<float>----------CV_32F

Mat_<double>--------CV_64F

1 int ROWS = 100; // height
 2 int COLS = 200; // width
 3 Mat img1(ROWS , COLS , CV_32FC1);  
 4   
 5 for (int i=0; i<ROWS ; i++)  
 6 {  
 7     for (int j=0; j<COLS ; j++)  
 8     {  
 9         img1.at<float>(i,j) = 3.2f;  
10     }  
11 }