Visually Meaningful Image Encryption Scheme Based on DWT and Schur Decomposition

Table 9

Time cost (average).

Algorithm	Sizes	Encryption time	Decryption time
Ours	256 × 256 (gray)	0.419665	0.266402
	512 × 512 (gray)	1.810313	1.079050
	256 × 256 (color)	1.138108	0.726431
	512 × 512 (color)	5.159817	3.102788
Reference [35]	256 × 256 (color)	1.85	—
	512 × 512 (color)	3.76	—
Reference [22]	256 × 256 (gray)	0.4049	1.4724
	512 × 512 (gray)	0.9279	10.5830