OpenCV는 Row-Major, Matlab은 Column-Major
출처: https://stackoverflow.com/questions/8184053/accessing-elements-of-a-cvmat-with-atfloati-j-is-it-x-y-or-row-col Accessing elements of a cv::Mat with at(i, j). Is it (x,y) or (row,col)? When we access specific elements of a cv::Mat structure, we can use mat.at(i,j) to access the element at position i,j. What is not immediately clear, however, whether (i,j) refers to the x,y coord... stackoverf..
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