Hy, i'm very nob in opencv, i'm using the subtract() method but i did not understand the parameters "mask" and "dtype", i will appreciate a lot if anybody can explain to me (an easy way) these parameters practical uses?
mask: optional operation mask; this is an 8-bit single channel array that specifies elements of the output array to be changed. (???).
dtype: optional depth of the output array(????).
Thanks in advance.