asking for an explaining of morphologyex function ！

edit

void morphologyEx( InputArray src, OutputArray dst, int op, InputArray kernel, Point anchor=Point(-1,-1), int iterations=1, int borderType=BORDER_CONSTANT, const Scalar& borderValue=morphologyDefaultBorderValue() );

who can explain the meaning of the following variables in morphologyex as detailed as possible

kernel；
anchor=point（-1，-1）； iteration=1；
bordertype；
Scalar& borderValue=morphologyDefaultBorderValue()；

a newbie so THANKS in advance for your any reply or comment！！！