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how to obtain an address of image in memory

I am having a object of image declared as Mat img now how to get the address of zeroth row and zeroth column

in what datatype it will be? how many bytes it takes to store value in one single cell of matrix?

how to obtain an address of image in memory

I am having a object of image declared as Mat img img; now how to get the address of zeroth row and zeroth column in memory

in what datatype it will be? how many bytes it takes to store value in one single cell of matrix?