[Retracted] Robust and Secure Zero-Watermarking Algorithm for Medical Images Based on Harris-SURF-DCT and Chaotic Map

Table 6

The running time of each part in the proposed algorithm.

Times	Description	Running time (ms)
T1	The time it takes to extract the features of Figure 6(a). The process is shown in Figure 4.	9.91
T2	The time it takes to encrypt the watermark image. The process is shown in Figure 7.	0.02
T3	The time it takes to embed an encrypted watermark in Figure 6(a). The process is shown in Figure 8.	10.64
T4	The time it takes to extract the encrypted watermark from the attacked Figure 6(a). The process is shown in Figure 9.	10.23
T5	The time it takes to decrypt the extracted encrypted watermark. The process is shown in Figure 10.	0.03