Fig. 4

Assembly of the anonymized image. For each generated image I_ϕ^(m),N_b blocks are extracted from the image and the fingerprint P. Fixing a block position b, we compute the NCC between each pair of blocks [I_ϕ^(m)]_b,[P]_b,m∈[1,M]. Then, we order the M image blocks according to their resulting NCCs, and we average the first L blocks pixel by pixel, obtaining the estimated block \([{\hat {\mathbf {I}}}]_{b}\). We follow this pipeline for each block position b, eventually assembling the results and estimating the anonymized image \({\hat {\mathbf {I}}}\)