1、Mat转一维数组

Mat mat；
//方法1，vector
std::vector<uchar> array(mat.rows*mat.cols);
if (mat.isContinuous())
    array = mat.data;

或者
std::vector<uchar> array;
if (mat.isContinuous()) {
  array.assign(mat.datastart, mat.dataend);
} else {
  for (int i = 0; i < mat.rows; ++i) {
    array.insert(array.end(), mat.ptr<uchar>(i), mat.ptr<uchar>(i)+mat.cols);
  }
}

//方法2，数组
unsigned char *array=new unsigned char[mat.rows*mat.cols];
if (mat.isContinuous())
    array = mat.data;

2、一维数组转Mat

Mat Array2Mat(uchar *array, int row, int col)
{
 
    uchar **array = new uchar[row][col];
    for (int i = 0; i <row; ++i)
    {
        for (int j = 0; j < col; ++j)
        {
            array[i][j] =  array[i * col + j] ;
        }
    }
    
    Mat img(row ,col,  CV_8UC1, (unsigned char*)array);
    return img;
 
}

3、Mat转二维数组

Mat Vec2Mat(uchar **array, int row, int col)
{
 
    Mat img(row ,col,  CV_8UC1);
    uchar *ptmp = NULL;
    for (int i = 0; i <row; ++i)
    {
        ptmp = img.ptr<uchar>(i);
 
        for (int j = 0; j < col; ++j)
        {
            ptmp[j] = array[i][j];
        }
    }
    
    return img;
 
}

4、二维数组转Mat

方法一：
unsigned char array[height][width];
cv::Mat mat(height, width, CV_8UC1, (unsigned char*)array );

方法二：
uchar** Mat2Vec(Mat mat)
{
	
	uchar **array = new uchar*[mat.rows];
	for (int i = 0; i<mat.rows; ++i)
		array[i] = new uchar[mat.cols];
	for (int i = 0; i < mat.rows; ++i)
	{
		for (int j = 0; j < mat.cols; ++j)
		{
			array[i][j] = mat.at<uchar>(i, j);
		}
	}
 
	return array;
}

参考链接：https://blog.csdn.net/liufang0109/article/details/79472059?utm_source=blogxgwz4