Visually Meaningful Image Encryption Scheme Based on DWT and Schur Decomposition

Table 12

NPCR and UACI tests (average).

Image	Size	NPCR			UACI
		Max	Min	Mean	Max	Min	Mean
Cameraman	256×256	99.6323	99.5804	99.6046	33.6808	33.2814	33.4338
Tree	256×256	99.6811	99.5514	99.6181	33.5978	33.3407	33.4933
Boat	256×256	99.6582	99.5682	99.6159	33.6314	33.4374	33.5430
Lena	512×512	99.6235	99.5991	99.6091	33.5194	33.4315	33.4732
Bridge	512×512	99.6204	99.5861	99.6073	33.5254	33.4237	33.4702
Couple	512×512	99.6315	99.5983	99.6150	33.5519	33.4054	33.4657
Boat	512×512	99.6300	99.6078	99.6175	33.5882	33.3520	33.4643