Fig. 8From: A robust encryption watermarking algorithm for medical images based on ridgelet-DCT and THM double chaosSensitivity analysis of encryption algorithm ( (a) the medical image of the watermark; (b) the correctly decrypted watermark; (c) the encrypted image; (d) the error decryption result with \(a = 1.4 + 10^{ - 16}\); (e) the error decryption result with \(a = 0.36 + 10^{ - 16}\); (f) the error decryption result with \(\alpha = 0.98 + 10^{ - 16}\))Back to article page