Accessing elements of cv::Mat

Question

A rather simple question. I have a matrix mask

cv::Mat mask = cv::Mat::zeros(20, 25, CV_8UC1);

and a point pt

cv::Point pt(5,7);

How can I access an element of mask at the location pt (at 5-th row and 7-th column)?

Answer 1

char value = mask.at<char>(pt);