Fig. 2: Numerical simulation of sPSF-MOE with a CR of 8.
From: Sparse point spread function-based multi-image optical encryption

a Plaintexts, corresponding sPSFs, convolution results, and reconstructed results frame by frame; b The compressed single-frame ciphertext; c CC values of the reconstructed results; d Lg(MSE) between the output and measurement during iterations. CC: correlation coefficient.