Fig. 8From: Optical image encryption using gamma distribution phase masks in the gyrator domainThe robustness test of the proposed method against occlusion attack on the encrypted image. a, b, c, d encrypted amplitude images with 20%, 40%, 60% and 80% occlusion; e, f, g, h encrypted phase images with 20%, 40%, 60% and 80% occlusion; i, j, k, l corresponding reconstructed images from a, b, c, dBack to article page