The hybridization depens on the ammount and type of bonds the atom analized has in the molecule.
For example:
A C atom bonded to 4 H atoms has a sp3 hybridization.
A C atom bonded to 2 H atoms and to 1 C with a double bond (like in ethene) has a sp2 hybridization
A C bonded to 1 H and 1 C with a triple bond (like in ethyne) has a sp hybridization.
Analyzing the type and amount of unions of the nitrogen and the carbonyl you will be able to determine the hybridization.
In the imine, the N atom has a double bond to a C and a simple bond two other C, plus the lone pair of electrons (counts as a bond) so it will have a sp2 hybridization.
In the carbonyl, the C has two simple bonds to other C and a double bond to an oxygen atom. It will also have a sp2 hybridization
