Visual Security Assessment via Saliency-Weighted Structure and Orientation Similarity for Selective Encrypted Images

Table 3

Statistical information of the test databases.

Database	IVC-SelectEncrypt	PEID
Reference image	8	20
Encrypted image	200	1080
Encryption type	5	10
Subjective score	MOS	MOS
Score range	[1, 5]	[0, 6]
Low quality	[1, 2.5]	[0, 2]
Moderate quality	(2.5, 3.5]	(2, 4]
High quality	(3.5, 5]	(4, 6]