Nonlinear Multi-Image Encryption Scheme with the Reality-Preserving Discrete Fractional Angular Transform and DNA Sequences

Table 6

PSNR values for different subimages in test group 1.

Image	PSNR (dB)				Resolution ratio
	Peppers	House	Elaine	Bridge
	23.8991	28.0304	24.7152	24.8944
	24.5692	29.7437	27.3227	28.2862
	28.2129	29.0744	28.1203	26.6629
	23.5328	28.2238	25.2936	25.4404
	24.801	31.7226	28.7284	32.4214
	20.4607	30.3214	26.8095	28.8676
	23.4738	29.5268	28.4828	26.9537
	44.819	32.0278	35.0628	46.598