Algorithm 2: Image protected by de-identification content swapping.

Input: The original image $I\in {\Re }^{n\times m\times 3}$ contains private objects $P^i,i=1,2,\dots ,N$;   de-identified objects in the image: $P_d^i,i=1,2,\dots ,N$   Output: The protected image $I_d\in {\Re }^{n\times m\times 3}$   for each $P_d^i$  in ${\mathit{P}}_{\mathit{d}}$ do $| P^i\stackrel{swapping}{⟵}{P}_d^i$   end $I_d=g\left(I\right)$