用opencv函数从txt文件中读取数据到二维矩阵的程序，并进行求逆，求和，求矩阵每列元素平均值，摄像机标定时的一小部分-Using OpenCV function from the txt file to read the data into a two-dimensional matrix procedures, and the inverse of matrix, and each column elements, on average, a small portion of camer