Algorithm 5 Initial Scaling Factor $\left(\alpha \right)$ generation.

Require:  Cover image (C) Ensure:  ISF $\left(\alpha \right)$ 1:Find range filter (R) values for C using $3\times 3$ filter 2:Partition R into $4\times 4$ non-overlpping blocks. 3:Find minimum value in each block and save it in MINVAL. 4:Average of MINVAL is ($\alpha )$ for C.