#include <opencv2/opencv.hpp>

using namespace cv;
using namespace std;

int main(int argc, char ** argv)
{
    Mat r = Mat(10, 3, CV_8UC3);
    randu(r, Scalar::all(0), Scalar::all(255)); // 随机值填充矩阵

    // Opencv 风格
    cout << "r (OpenCV 默认风格) = " << r << ";" << endl << endl;

    // Python 风格
    cout << "r (Python 风格) = " << format(r, Formatter::FMT_PYTHON) << ";" << endl << endl;

    // 逗号风格
    cout << "r (逗号风格) = " << format(r, Formatter::FMT_CSV) << ";" << endl << endl;

    // Numpy 风格
    cout << "r (Numpy风格) = " << format(r, Formatter::FMT_NUMPY) << ";" << endl << endl;

    // C语言风格
    cout << "r (C语言风格) = " << format(r, Formatter::FMT_C) << ";" << endl << endl;

    return 0;
}

运行：

r (OpenCV 默认风格) = [ 91,   2,  79, 179,  52, 205, 236,   8, 181;
 239,  26, 248, 207, 218,  45, 183, 158, 101;
 102,  18, 118,  68, 210, 139, 198, 207, 211;
 181, 162, 197, 191, 196,  40,   7, 243, 230;
  45,   6,  48, 173, 242, 125, 175,  90,  63;
  90,  22, 112, 221, 167, 224, 113, 208, 123;
 214,  35, 229,   6, 143, 138,  98,  81, 118;
 187, 167, 140, 218, 178,  23,  43, 133, 154;
 150,  76, 101,   8,  38, 238,  84,  47,   7;
 117, 246, 163, 237,  69, 129,  60, 101,  41];

r (Python 风格) = [[[ 91,   2,  79], [179,  52, 205], [236,   8, 181]],
 [[239,  26, 248], [207, 218,  45], [183, 158, 101]],
 [[102,  18, 118], [ 68, 210, 139], [198, 207, 211]],
 [[181, 162, 197], [191, 196,  40], [  7, 243, 230]],
 [[ 45,   6,  48], [173, 242, 125], [175,  90,  63]],
 [[ 90,  22, 112], [221, 167, 224], [113, 208, 123]],
 [[214,  35, 229], [  6, 143, 138], [ 98,  81, 118]],
 [[187, 167, 140], [218, 178,  23], [ 43, 133, 154]],
 [[150,  76, 101], [  8,  38, 238], [ 84,  47,   7]],
 [[117, 246, 163], [237,  69, 129], [ 60, 101,  41]]];

r (逗号风格) =  91,   2,  79, 179,  52, 205, 236,   8, 181
239,  26, 248, 207, 218,  45, 183, 158, 101
102,  18, 118,  68, 210, 139, 198, 207, 211
181, 162, 197, 191, 196,  40,   7, 243, 230
 45,   6,  48, 173, 242, 125, 175,  90,  63
 90,  22, 112, 221, 167, 224, 113, 208, 123
214,  35, 229,   6, 143, 138,  98,  81, 118
187, 167, 140, 218, 178,  23,  43, 133, 154
150,  76, 101,   8,  38, 238,  84,  47,   7
117, 246, 163, 237,  69, 129,  60, 101,  41
;

r (Numpy风格) = array([[[ 91,   2,  79], [179,  52, 205], [236,   8, 181]],
       [[239,  26, 248], [207, 218,  45], [183, 158, 101]],
       [[102,  18, 118], [ 68, 210, 139], [198, 207, 211]],
       [[181, 162, 197], [191, 196,  40], [  7, 243, 230]],
       [[ 45,   6,  48], [173, 242, 125], [175,  90,  63]],
       [[ 90,  22, 112], [221, 167, 224], [113, 208, 123]],
       [[214,  35, 229], [  6, 143, 138], [ 98,  81, 118]],
       [[187, 167, 140], [218, 178,  23], [ 43, 133, 154]],
       [[150,  76, 101], [  8,  38, 238], [ 84,  47,   7]],
       [[117, 246, 163], [237,  69, 129], [ 60, 101,  41]]], dtype='uint8');

r (C语言风格) = { 91,   2,  79, 179,  52, 205, 236,   8, 181,
 239,  26, 248, 207, 218,  45, 183, 158, 101,
 102,  18, 118,  68, 210, 139, 198, 207, 211,
 181, 162, 197, 191, 196,  40,   7, 243, 230,
  45,   6,  48, 173, 242, 125, 175,  90,  63,
  90,  22, 112, 221, 167, 224, 113, 208, 123,
 214,  35, 229,   6, 143, 138,  98,  81, 118,
 187, 167, 140, 218, 178,  23,  43, 133, 154,
 150,  76, 101,   8,  38, 238,  84,  47,   7,
 117, 246, 163, 237,  69, 129,  60, 101,  41};

---

参考：

《OpenCV3 编程入门》 毛星云 P92