Fig. 13From: A robust encryption watermarking algorithm for medical images based on ridgelet-DCT and THM double chaosThe images and watermark results under translation attacks ((a) left distance 10%; (a1) the watermark result of (a); (b) right distance 10%; (b1) the watermark result of (b); (c) down distance 22%; (c1) the watermark result of (c); (d) up distance 18%; (d1) the watermark result of (d))Back to article page